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<a class="post-title-link" href="/2023/01/02/CompletableFuture使用/" itemprop="url">CompletableFuture使用</a></h1>
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2023-01-02
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<p>本文地址：<a href="https://www.yuech.net/2023/01/02/CompletableFuture%E4%BD%BF%E7%94%A8/" target="_blank" rel="noopener">CompletableFuture使用</a></p>
<h3 id="1、自定义线程池配置类"><a href="#1、自定义线程池配置类" class="headerlink" title="1、自定义线程池配置类"></a>1、自定义线程池配置类</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* Copyright © 2022 Yuech and/or its affiliates. All rights reserved. */</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">package</span> ...;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> lombok.Data;</span><br><span class="line"><span class="keyword">import</span> org.springframework.boot.context.properties.ConfigurationProperties;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 定时任务线程池配置</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> Yuech</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span> 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@since</span> 2022-11-24 16:01</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Data</span></span><br><span class="line"><span class="meta">@ConfigurationProperties</span>(prefix = <span class="string">"common.pool"</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">CommonThreadPoolProperties</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 线程池是否可用</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">boolean</span> enabled = <span class="keyword">true</span>;</span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 核心线程数</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> corePoolSize = <span class="number">20</span>;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 最大线程数</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> maxPoolSize = <span class="number">40</span>;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 线程池维护线程所允许的空闲时间</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> keepAliveSeconds = <span class="number">300</span>;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 队列最大长度</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">int</span> queueCapacity = -<span class="number">1</span>;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 线程名前缀</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">private</span> String threadNamePrefix = <span class="string">"Common-Execute-"</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h3 id="2、自定义线程池"><a href="#2、自定义线程池" class="headerlink" title="2、自定义线程池"></a>2、自定义线程池</h3><p>使用CallerRunsPolicy线程池丢弃策略，如果线程池满了，将会交给主线程执行<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* Copyright © 2022 Yuech and/or its affiliates. All rights reserved. */</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.springframework.beans.factory.annotation.Autowired;</span><br><span class="line"><span class="keyword">import</span> org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;</span><br><span class="line"><span class="keyword">import</span> org.springframework.boot.context.properties.EnableConfigurationProperties;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Bean;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.ComponentScan;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.annotation.Configuration;</span><br><span class="line"><span class="keyword">import</span> org.springframework.core.task.AsyncTaskExecutor;</span><br><span class="line"><span class="keyword">import</span> org.springframework.scheduling.annotation.EnableAsync;</span><br><span class="line"><span class="keyword">import</span> org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.concurrent.ThreadPoolExecutor;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 线程池配置</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> Yuech</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span> 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@since</span> 2022-11-24 15:57</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="meta">@EnableAsync</span></span><br><span class="line"><span class="meta">@ConditionalOnProperty</span>(prefix = <span class="string">"common.pool"</span>, value = <span class="string">"enabled"</span>, matchIfMissing = <span class="keyword">true</span>)</span><br><span class="line"><span class="meta">@EnableConfigurationProperties</span>({CommonThreadPoolProperties.class})</span><br><span class="line"><span class="meta">@ComponentScan</span>(value = <span class="string">"com.yuech.config"</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">CommonThreadPoolConfig</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Autowired</span></span><br><span class="line"> <span class="keyword">private</span> CommonThreadPoolProperties properties;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Bean</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> ThreadPoolTaskExecutor <span class="title">commonAsyncTaskExecutor</span><span class="params">()</span> </span>{</span><br><span class="line"> ThreadPoolTaskExecutor executor = <span class="keyword">new</span> ThreadPoolTaskExecutor();</span><br><span class="line"> <span class="comment">// 核心线程池大小</span></span><br><span class="line"> executor.setCorePoolSize(properties.getCorePoolSize());</span><br><span class="line"> <span class="comment">// 最大线程数</span></span><br><span class="line"> executor.setMaxPoolSize(properties.getMaxPoolSize());</span><br><span class="line"> <span class="comment">// 队列容量</span></span><br><span class="line"> executor.setQueueCapacity(properties.getQueueCapacity());</span><br><span class="line"> <span class="comment">// 活跃时间</span></span><br><span class="line"> executor.setKeepAliveSeconds(properties.getKeepAliveSeconds());</span><br><span class="line"> <span class="comment">// 线程名字前缀</span></span><br><span class="line"> executor.setThreadNamePrefix(properties.getThreadNamePrefix());</span><br><span class="line"></span><br><span class="line"> <span class="comment">/*</span></span><br><span class="line"><span class="comment"> * setRejectedExecutionHandler：当pool已经达到max size的时候，如何处理新任务</span></span><br><span class="line"><span class="comment"> * CallerRunsPolicy：不在新线程中执行任务，而是由调用者所在的线程来执行</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> executor.setRejectedExecutionHandler(<span class="keyword">new</span> ThreadPoolExecutor.CallerRunsPolicy());</span><br><span class="line"> executor.initialize();</span><br><span class="line"> <span class="keyword">return</span> executor;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h3 id="3、CompletableFuture调用"><a href="#3、CompletableFuture调用" class="headerlink" title="3、CompletableFuture调用"></a>3、CompletableFuture调用</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> ...;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> lombok.extern.slf4j.Slf4j;</span><br><span class="line"><span class="keyword">import</span> org.springframework.beans.BeanUtils;</span><br><span class="line"><span class="keyword">import</span> org.springframework.beans.factory.annotation.Autowired;</span><br><span class="line"><span class="keyword">import</span> org.springframework.beans.factory.annotation.Qualifier;</span><br><span class="line"><span class="keyword">import</span> org.springframework.beans.factory.annotation.Value;</span><br><span class="line"><span class="keyword">import</span> org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;</span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Service;</span><br><span class="line"><span class="keyword">import</span> org.springframework.transaction.annotation.Transactional;</span><br><span class="line"><span class="keyword">import</span> org.springframework.util.CollectionUtils;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> javax.annotation.Resource;</span><br><span class="line"><span class="keyword">import</span> java.time.LocalDateTime;</span><br><span class="line"><span class="keyword">import</span> java.util.HashMap;</span><br><span class="line"><span class="keyword">import</span> java.util.List;</span><br><span class="line"><span class="keyword">import</span> java.util.Map;</span><br><span class="line"><span class="keyword">import</span> java.util.concurrent.CompletableFuture;</span><br><span class="line"><span class="keyword">import</span> java.util.concurrent.ExecutionException;</span><br><span class="line"><span class="keyword">import</span> java.util.stream.Collectors;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 日志服务实现类</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> Yuech</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@since</span> 2022-10-20 17:01</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Slf</span>4j</span><br><span class="line"><span class="meta">@Service</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">AccessLogServiceImpl</span> <span class="keyword">extends</span> <span class="title">ServiceImpl</span><<span class="title">AccessLogMapper</span>, <span class="title">AccessLog</span>> <span class="keyword">implements</span> <span class="title">AccessLogService</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Resource</span></span><br><span class="line"> <span class="keyword">private</span> AccessLogInfoService infoService;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Resource</span></span><br><span class="line"> <span class="keyword">private</span> AccessLogManager accessLogManager;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Resource</span>(name = <span class="string">"commonAsyncTaskExecutor"</span>)</span><br><span class="line"> <span class="keyword">private</span> ThreadPoolTaskExecutor commonAsyncTaskExecutor;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Transactional</span>(rollbackFor = Exception.class)</span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> Result<AccessLogPushResponseDTO> <span class="title">resendOrPushAgain</span><span class="params">(List<AccessLogVO> accessLogList)</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (CollectionUtils.isEmpty(accessLogList)) {</span><br><span class="line"> <span class="keyword">return</span> Result.success(<span class="keyword">new</span> AccessLogPushResponseDTO(CommonConstant.ZERO_LONG,</span><br><span class="line"> CommonConstant.ZERO_LONG, <span class="keyword">null</span>));</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">// 重新下发或重新推送</span></span><br><span class="line"> List<CompletableFuture<AccessLogPushResponseDetailDTO>> responseFutureList =</span><br><span class="line"> accessLogList.stream().map(accessLog -> doResendOrPushAgain(accessLog)).collect(Collectors.toList());</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 使用allOf方法来表示所有的并行任务</span></span><br><span class="line"> CompletableFuture<Void> allFutures =</span><br><span class="line"> CompletableFuture</span><br><span class="line"> .allOf(responseFutureList.toArray(<span class="keyword">new</span> CompletableFuture[responseFutureList.size()]));</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 下面的方法可以帮助我们获得所有子任务的处理结果</span></span><br><span class="line"> CompletableFuture<List<AccessLogPushResponseDetailDTO>> finalResults = allFutures</span><br><span class="line"> .thenApply(v -> responseFutureList.stream().map(accountFindingFuture -> accountFindingFuture.join())</span><br><span class="line"> .collect(Collectors.toList()));</span><br><span class="line"></span><br><span class="line"> AccessLogPushResponseDTO responseDto = <span class="keyword">new</span> AccessLogPushResponseDTO();</span><br><span class="line"> Result<AccessLogPushResponseDTO> result = Result.success(responseDto);</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> List<AccessLogPushResponseDetailDTO> responseDetailList = finalResults.get();</span><br><span class="line"> <span class="keyword">if</span> (CollectionUtils.isEmpty(responseDetailList)) {</span><br><span class="line"> <span class="keyword">return</span> Result.success(<span class="keyword">new</span> AccessLogPushResponseDTO(CommonConstant.ZERO_LONG,</span><br><span class="line"> CommonConstant.ZERO_LONG, <span class="keyword">null</span>));</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> Long successCount = CommonConstant.ZERO_LONG;</span><br><span class="line"> Long failureCount = CommonConstant.ZERO_LONG;</span><br><span class="line"> <span class="keyword">for</span> (AccessLogPushResponseDetailDTO dto : responseDetailList) {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (dto == <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">continue</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (AccessResponseStatus.SUCCESS.getStatus().equals(dto.getResult())) {</span><br><span class="line"> successCount += <span class="number">1</span>;</span><br><span class="line"> } <span class="keyword">else</span> <span class="keyword">if</span> (AccessResponseStatus.FAIL.getStatus().equals(dto.getResult())) {</span><br><span class="line"> failureCount += <span class="number">1</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> responseDto.setDetailList(responseDetailList);</span><br><span class="line"> responseDto.setSuccessCount(successCount);</span><br><span class="line"> responseDto.setFailureCount(failureCount);</span><br><span class="line"> } <span class="keyword">catch</span> (InterruptedException e) {</span><br><span class="line"> log.error(<span class="string">"resendOrPushAgain InterruptedException异常"</span>, e);</span><br><span class="line"> result = Result.DefaultFailure(<span class="string">"resendOrPushAgain ExecutionException异常 : "</span> + e.getMessage());</span><br><span class="line"> } <span class="keyword">catch</span> (ExecutionException e) {</span><br><span class="line"> log.error(<span class="string">"resendOrPushAgain ExecutionException异常"</span>, e);</span><br><span class="line"> result = Result.DefaultFailure(<span class="string">"resendOrPushAgain ExecutionException异常 : "</span> + e.getMessage());</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> result;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">private</span> CompletableFuture<AccessLogPushResponseDetailDTO> <span class="title">doResendOrPushAgain</span><span class="params">(AccessLogVO accessLog)</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> CompletableFuture.supplyAsync(() -> {</span><br><span class="line"> AccessLogAndDetailDTO dto = getAccessLogAndDetailInfo(accessLog);</span><br><span class="line"> <span class="keyword">if</span> (dto == <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> AccessLogPushResponseDetailDTO(<span class="keyword">null</span>, AccessResponseStatus.FAIL.getStatus(),</span><br><span class="line"> AccessLogConstants.SEND_OR_PUSH_ACCESS_LOG_IS_NULL);</span><br><span class="line"> }</span><br><span class="line"> HttpReq httpReq = <span class="keyword">null</span>;</span><br><span class="line"> String config = dto.getConfig();</span><br><span class="line"> String id = dto.getId();</span><br><span class="line"> <span class="keyword">if</span> (StringUtils.isNotBlank(config)) {</span><br><span class="line"> httpReq = JacksonUtils.toObj(config, HttpReq.class);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (httpReq == <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> AccessLogPushResponseDetailDTO(id, AccessResponseStatus.FAIL.getStatus(),</span><br><span class="line"> AccessLogConstants.SEND_OR_PUSH_ACCESS_LOG_CONFIG_IS_NULL);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">// ...</span></span><br><span class="line"></span><br><span class="line"> Integer result = AccessResponseStatus.SUCCESS.getStatus();</span><br><span class="line"> AccessLogDto accessLogDto = <span class="keyword">new</span> AccessLogDto();</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> AccessLogPushResponseDetailDTO(id, result, accessLogDto.getRes());</span><br><span class="line"> }, commonAsyncTaskExecutor);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h3 id="4、参考"><a href="#4、参考" class="headerlink" title="4、参考"></a>4、参考</h3><p><a href="http://events.jianshu.io/p/8c9dc192fa63" target="_blank" rel="noopener">http://events.jianshu.io/p/8c9dc192fa63</a></p>
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<a class="post-title-link" href="/2022/04/21/Jsch+Hutool实现文件上传与远程命令执行/" itemprop="url">Jsch+Hutool实现文件上传与远程命令执行</a></h1>
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<p>本文地址：<a href="https://www.yuech.net//2022/04/21/Jsch+Hutool%E5%AE%9E%E7%8E%B0%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E4%B8%8E%E8%BF%9C%E7%A8%8B%E5%91%BD%E4%BB%A4%E6%89%A7%E8%A1%8C/" target="_blank" rel="noopener">Jsch+Hutool实现文件上传与远程命令执行</a></p>
<p>环境信息：<br>JDK版本：JDK_1.8<br>Jsch版本：0.1.5<br>Hutool版本：5.7.21</p>
<hr>
<h3 id="1、添加maven依赖"><a href="#1、添加maven依赖" class="headerlink" title="1、添加maven依赖"></a>1、添加maven依赖</h3><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>com.jcraft<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>jsch<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>0.1.55<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependency</span>></span></span><br><span class="line"></span><br><span class="line"><span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>cn.hutool<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>hutool-all<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>5.7.21<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependency</span>></span></span><br></pre></td></tr></table></figure>
<h3 id="2、文件上传"><a href="#2、文件上传" class="headerlink" title="2、文件上传"></a>2、文件上传</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* Copyright © 2022 Yuech and/or its affiliates. All rights reserved. */</span></span><br><span class="line"><span class="keyword">package</span> com.yc.apollo.test;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> cn.hutool.core.io.FileUtil;</span><br><span class="line"><span class="keyword">import</span> cn.hutool.core.io.IoUtil;</span><br><span class="line"><span class="keyword">import</span> cn.hutool.core.util.StrUtil;</span><br><span class="line"><span class="keyword">import</span> cn.hutool.extra.ftp.AbstractFtp;</span><br><span class="line"><span class="keyword">import</span> cn.hutool.extra.ssh.JschUtil;</span><br><span class="line"><span class="keyword">import</span> cn.hutool.extra.ssh.Sftp;</span><br><span class="line"><span class="keyword">import</span> com.jcraft.jsch.*;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.File;</span><br><span class="line"><span class="keyword">import</span> java.util.HashMap;</span><br><span class="line"><span class="keyword">import</span> java.util.Map;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> Yuech</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span> 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@since</span> 2022-01-10 11:30</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">FileUploadTest</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="comment">//本地文件路径</span></span><br><span class="line"> String localFile = <span class="string">"d:\\user\\yuechang\\desktop\\test.txt"</span>; </span><br><span class="line"> <span class="comment">//上传到远程的文件路径，要保证登录用户有写权限</span></span><br><span class="line"> String remoteFile = <span class="string">"/app/deploy"</span>; </span><br><span class="line"> Session session = <span class="keyword">null</span>;</span><br><span class="line"> Sftp sftp = <span class="keyword">null</span>;</span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> session = JschUtil.openSession(HostInfoConstants.REMOTE_HOST,</span><br><span class="line"> HostInfoConstants.REMOTE_PORT,</span><br><span class="line"> HostInfoConstants.USERNAME,</span><br><span class="line"> HostInfoConstants.PASSWORD);</span><br><span class="line"></span><br><span class="line"> sftp = <span class="keyword">new</span> Sftp(session, AbstractFtp.DEFAULT_CHARSET);</span><br><span class="line"> String normalize = FileUtil.normalize(remoteFile);</span><br><span class="line"> sftp.upload(normalize, <span class="keyword">new</span> File(localFile));</span><br><span class="line"></span><br><span class="line"> } <span class="keyword">finally</span> {</span><br><span class="line"> IoUtil.close(sftp);</span><br><span class="line"> }</span><br><span class="line"> System.out.println(<span class="string">"上传成功"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h3 id="3、远程命令执行"><a href="#3、远程命令执行" class="headerlink" title="3、远程命令执行"></a>3、远程命令执行</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* Copyright © 2022 Yuech and/or its affiliates. All rights reserved. */</span></span><br><span class="line"><span class="keyword">package</span> com.yc.apollo.test;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> cn.hutool.core.io.IoUtil;</span><br><span class="line"><span class="keyword">import</span> cn.hutool.core.util.CharsetUtil;</span><br><span class="line"><span class="keyword">import</span> cn.hutool.core.util.StrUtil;</span><br><span class="line"><span class="keyword">import</span> cn.hutool.extra.ssh.ChannelType;</span><br><span class="line"><span class="keyword">import</span> cn.hutool.extra.ssh.JschUtil;</span><br><span class="line"><span class="keyword">import</span> com.jcraft.jsch.ChannelExec;</span><br><span class="line"><span class="keyword">import</span> com.jcraft.jsch.JSchException;</span><br><span class="line"><span class="keyword">import</span> com.jcraft.jsch.Session;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"><span class="keyword">import</span> java.io.InputStream;</span><br><span class="line"><span class="keyword">import</span> java.nio.charset.Charset;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 远程命令执行测试类</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> Yuech</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span> 1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@since</span> 2022-04-13 9:36</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">CmdExecTest</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> String cmd = <span class="string">"mv /app/deploy/test.txt /app/deploy/test_20220413.txt"</span>;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> IOException, JSchException </span>{</span><br><span class="line"></span><br><span class="line"> Charset charset = CharsetUtil.CHARSET_UTF_8;</span><br><span class="line"> Session session = JschUtil.createSession(HostInfoConstants.REMOTE_HOST,</span><br><span class="line"> HostInfoConstants.REMOTE_PORT,</span><br><span class="line"> HostInfoConstants.USERNAME,</span><br><span class="line"> HostInfoConstants.PASSWORD);</span><br><span class="line"></span><br><span class="line"> ChannelExec channel = (ChannelExec) JschUtil.createChannel(session, ChannelType.EXEC);</span><br><span class="line"></span><br><span class="line"> <span class="comment">// 添加环境变量</span></span><br><span class="line"> channel.setCommand(cmd);</span><br><span class="line"> InputStream inputStream = channel.getInputStream();</span><br><span class="line"> InputStream errStream = channel.getErrStream();</span><br><span class="line"> channel.connect();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">final</span> String[] error = <span class="keyword">new</span> String[<span class="number">1</span>];</span><br><span class="line"> <span class="keyword">final</span> String[] result = <span class="keyword">new</span> String[<span class="number">1</span>];</span><br><span class="line"> <span class="comment">//</span></span><br><span class="line"></span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> System.out.println(error[<span class="number">0</span>] = IoUtil.read(errStream, charset));</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> <span class="keyword">if</span> (!StrUtil.contains(e.getMessage(), <span class="string">"Pipe closed"</span>)) {</span><br><span class="line"> <span class="comment">// DefaultSystemLog.getLog().error("读取 exec err 流发生异常", e);</span></span><br><span class="line"> error[<span class="number">0</span>] = <span class="string">"读取 exec err 流发生异常"</span> + e.getMessage();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">try</span> {</span><br><span class="line"> result[<span class="number">0</span>] = IoUtil.read(inputStream, charset);</span><br><span class="line"> } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> <span class="keyword">if</span> (!StrUtil.contains(e.getMessage(), <span class="string">"Pipe closed"</span>)) {</span><br><span class="line"> <span class="comment">//DefaultSystemLog.getLog().error("读取 exec 流发生异常", e);</span></span><br><span class="line"> result[<span class="number">0</span>] = <span class="string">"读取 exec 流发生异常"</span> + e.getMessage();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> System.out.println(<span class="string">"结束 \n"</span> + result[<span class="number">0</span>] + <span class="string">" "</span> + error[<span class="number">0</span>]);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h3 id="4、参考信息"><a href="#4、参考信息" class="headerlink" title="4、参考信息"></a>4、参考信息</h3><p><a href="https://github.com/dromara/Jpom" target="_blank" rel="noopener">jpom</a></p>
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<h2 id="PDCA-Cycle"><a href="#PDCA-Cycle" class="headerlink" title="PDCA Cycle"></a>PDCA Cycle</h2><blockquote>
<p><a href="https://www.yuech.net/2022/01/01/PDCA%20Cycle/" target="_blank" rel="noopener">PDCA Cycle</a></p>
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<h3 id="1、PDCA-释义"><a href="#1、PDCA-释义" class="headerlink" title="1、PDCA 释义"></a>1、PDCA 释义</h3><ul>
<li>P：Plan</li>
<li>D: Do</li>
<li>C：Check</li>
<li>A：Action</li>
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<h3 id="2、PDCA-Cycle循环"><a href="#2、PDCA-Cycle循环" class="headerlink" title="2、PDCA Cycle循环"></a>2、PDCA Cycle循环</h3><p><img src="https://asq.org/-/media/Images/Learn-About-Quality/PDCA-Cycle/pdca-cycle.png?h=180&w=216&la=en" alt="PDCA Cycle循环"></p>
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<a class="post-title-link" href="/2021/09/11/TCP的三次握手和四次挥手/" itemprop="url">TCP的三次握手和四次挥手</a></h1>
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<h2 id="TCP的三次握手和四次挥手"><a href="#TCP的三次握手和四次挥手" class="headerlink" title="TCP的三次握手和四次挥手"></a>TCP的三次握手和四次挥手</h2><blockquote>
<p><a href="https://www.yuech.net/2021/09/11/TCP%E7%9A%84%E4%B8%89%E6%AC%A1%E6%8F%A1%E6%89%8B%E5%92%8C%E5%9B%9B%E6%AC%A1%E6%8C%A5%E6%89%8B/" target="_blank" rel="noopener">TCP的三次握手和四次挥手</a></p>
</blockquote>
<h3 id="1、TCP头部的规范定义"><a href="#1、TCP头部的规范定义" class="headerlink" title="1、TCP头部的规范定义"></a>1、TCP头部的规范定义</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">0</span> <span class="number">15</span>|<span class="number">16</span> <span class="number">31</span></span><br><span class="line">+------------------------------------------+------------------------------------------+</span><br><span class="line">| <span class="number">16</span>位源端口号 | <span class="number">16</span>位目的端口号 |</span><br><span class="line">+------------------------------------------+------------------------------------------+</span><br><span class="line">| <span class="number">32</span>位序号/<span class="function">Sequence <span class="title">number</span> <span class="params">(seq)</span> |</span></span><br><span class="line"><span class="function">+------------------------------------------+------------------------------------------+</span></span><br><span class="line"><span class="function">| 32位确认号/Acknowledge <span class="title">number</span> <span class="params">(ack)</span> |</span></span><br><span class="line"><span class="function">+------------------------------------------+------------------------------------------+</span></span><br><span class="line"><span class="function">|4位头部信息|6位保留|URG|ACK|PSH|RST|SYN|FIN | 16位窗口大小 |</span></span><br><span class="line"><span class="function">+------------------------------------------+------------------------------------------+</span></span><br><span class="line"><span class="function">| 16位校验和 | 16位紧急指针 |</span></span><br><span class="line"><span class="function">+------------------------------------------+------------------------------------------+</span></span><br><span class="line"><span class="function">| 选项最多40字节 |</span></span><br><span class="line"><span class="function">+------------------------------------------+------------------------------------------+</span></span><br></pre></td></tr></table></figure>
<h3 id="2、TCP的三次握手："><a href="#2、TCP的三次握手：" class="headerlink" title="2、TCP的三次握手："></a>2、TCP的三次握手：</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Client(SYN_SENT) --> SYN=<span class="number">1</span>,seq=k --> Server(SYN_RCVD)</span><br><span class="line">Client(ESTABLISHED) <-- SYN=<span class="number">1</span>，ACK=<span class="number">1</span>,ack=k+<span class="number">1</span>,seq=m <-- Server(SYN_RCVD)</span><br><span class="line">Client(ESTABLISHED) --> ACK=<span class="number">1</span>,seq=m+<span class="number">1</span>,seq=l --> Server(ESTABLISHED)</span><br></pre></td></tr></table></figure>
<p>为什么需要三次握手：<br>能够避免server端资源的浪费。<br>1、当Client端发送连接请求并没有丢失，而是在某个网络接点上滞留了，以至于延迟到连接释放以后的某个节点才到达Server；<br>2、本来只是一个早已失效的报文段，Server端接收到之后误认为这是Client端的一个新的请求，于是发送了连接确认报文；<br>3、如果不采用”三次握手”，只要等Server发送确认，新的连接就已经建立了；<br>4、等待Client端发送数据，但是此时Client不会理睬Server端的确认，也不会向Server端发送数据；<br>5、但是Server端认为连接已经建立还在等着Client的数据，此时就会存在Server端资源的浪费；</p>
<h3 id="3、TCP的四次挥手"><a href="#3、TCP的四次挥手" class="headerlink" title="3、TCP的四次挥手"></a>3、TCP的四次挥手</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Client(FIN_WAIT_1) --> FIN=<span class="number">1</span>,seq=k --> Server(CLOSE_WAIT)</span><br><span class="line">Client(FIN_WAIT_2) <-- ACK=<span class="number">1</span>,ack=k+<span class="number">1</span>,seq=m <-- Server(CLOSE_WAIT)</span><br><span class="line">Client(FIN_WAIT_2) <-- FIN=<span class="number">1</span>,seq=i <-- Server(LAST_ACK)</span><br><span class="line">Client(TIME_WAIT/<span class="number">2</span>MSL) --> ACK=<span class="number">1</span>,ack=i+<span class="number">1</span>,seq=l --> Server(CLOSE)</span><br></pre></td></tr></table></figure>
<h3 id="4、为什么需要四次挥手"><a href="#4、为什么需要四次挥手" class="headerlink" title="4、为什么需要四次挥手"></a>4、为什么需要四次挥手</h3><p>首先TCP是一种面向连接的、可靠的、基于字节流的运输层通讯协议，TCP是全双工模式<br>建立连接时，通过SYN+ACK能够确定双方均在线即可正常收发报文；<br>由于双工模式，假设Client端没有需要发送的报文了，于是发送FIN报文，Server端收到后给出了ACK确认报文；<br>但是有可能Server端还存在需要发送的报文，这个时候就需要Server端发送一次FIN报文，让Client端来确认</p>
<h3 id="5、为什么需要等待2MSL？"><a href="#5、为什么需要等待2MSL？" class="headerlink" title="5、为什么需要等待2MSL？"></a>5、为什么需要等待2MSL？</h3><p>MSL：报文段最大生存时间，它是任何报文在丢弃前在网络内的最长时间。<br>第一点：保证TCP全双工能够正常可靠关闭；<br>第二点：保证这次连续的重复数据段从网络中消失；</p>
<h3 id="6、参考博客"><a href="#6、参考博客" class="headerlink" title="6、参考博客"></a>6、参考博客</h3><blockquote>
<p><a href="https://www.cnblogs.com/onesea/p/13053697.html" target="_blank" rel="noopener">一文彻底搞懂 TCP三次握手、四次挥手过程及原理</a></p>
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<a class="post-title-link" href="/2020/04/11/UML类图六种关系说明与Java代码展示/" itemprop="url">UML类图六种关系说明与Java代码展示</a></h1>
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<p>UML类图六种关系说明与Java代码展示</p>
<p>工具信息</p>
<ul>
<li>Enterprise Architect 12</li>
</ul>
<h3 id="1、UML类图六种关系"><a href="#1、UML类图六种关系" class="headerlink" title="1、UML类图六种关系"></a>1、UML类图六种关系</h3><ul>
<li>1、泛化关系(generalization)</li>
<li>2、实现关系(realize)</li>
<li>3、聚合关系(aggregation)</li>
<li>4、组合关系(composition) </li>
<li>5、关联关系(association)</li>
<li>6、依赖关系(dependency)</li>
</ul>
<p>这六种关系以及对应的符合是否了解呢，下面我们通过一张很经典的例子来展示一下。</p>
<h3 id="2、例子"><a href="#2、例子" class="headerlink" title="2、例子"></a>2、例子</h3><p><img src="https://github.com/raw/yuechang/blog-comment/master/blog-picture/uml-class-diagram.png" alt="uml-class-diagram"></p>
<ul>
<li>Vehicle类为一个抽象类</li>
<li>Vehicle类下面有两个继承类：Car和Bicycly，它们之间的关系为实现关系，使用带空心箭头的虚线表示；</li>
<li>Car与SUV之间也是继承关系，它们之间的关系为泛化关系，使用带空心的实线表示；</li>
<li>Car与Engine之间是组合关系，使用实心菱形的实线表示；</li>
<li>Student与Class之间是聚合关系，使用空心菱形的实线表示；</li>
<li>Student与IdCard之间为关联关系，使用实线表示；</li>
<li>Student上学需要骑Bicycle，与Bicycle是一种依赖关系，使用带箭头的虚线表示；</li>
</ul>
<p>下面详细介绍这六种关系。</p>
<h3 id="3、类之间的关系与Java代码展示"><a href="#3、类之间的关系与Java代码展示" class="headerlink" title="3、类之间的关系与Java代码展示"></a>3、类之间的关系与Java代码展示</h3><p>他们可以分为三组来区别对比记忆</p>
<ul>
<li>实现关系(realize)和泛化关系(generalization)</li>
<li>聚合关系(aggregation)和组合关系(composition) </li>
<li>关联关系(association)和依赖关系(dependency)</li>
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