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class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-02-02T02:41:43.301Z" title="更新于 2023-02-02 10:41:43">2023-02-02</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Java-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/">Java 学习笔记</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1.2k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>5分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="给SpringCloud-Gateway加全局过滤器，添加请求日志"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="先上代码"><a href="#先上代码" class="headerlink" title="先上代码"></a>先上代码</h1><h2 id="代码结构："><a href="#代码结构：" class="headerlink" title="代码结构："></a>代码结构：</h2><p><img src="https://img-blog.csdnimg.cn/c29e31f0bab84722983c71f6ce6144aa.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAcXFfMzAwODczOTU=,size_14,color_FFFFFF,t_70,g_se,x_16#pic_center"></p>
<h2 id="具体代码"><a href="#具体代码" class="headerlink" title="具体代码"></a>具体代码</h2><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.litianyi.supermall.gateway.filters;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.litianyi.supermall.gateway.context.BaseContextHandler;</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.cloud.gateway.filter.GatewayFilterChain;</span><br><span class="line"><span class="keyword">import</span> org.springframework.cloud.gateway.filter.GlobalFilter;</span><br><span class="line"><span class="keyword">import</span> org.springframework.core.Ordered;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.server.reactive.ServerHttpRequest;</span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Component;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.server.ServerWebExchange;</span><br><span class="line"><span class="keyword">import</span> reactor.core.publisher.Mono;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.time.Instant;</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"> * <span class="doctag">@author</span> litianyi</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">@date</span> 2022/1/7 12:19 PM</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="meta">@Slf4j</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">GlobalStartLoggerFilter</span> <span class="keyword">implements</span> <span class="title class_">GlobalFilter</span>, Ordered {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">void</span> <span class="title function_">startLogInfo</span><span class="params">(ServerWebExchange exchange)</span> {</span><br><span class="line"> <span class="type">ServerHttpRequest</span> <span class="variable">request</span> <span class="operator">=</span> exchange.getRequest();</span><br><span class="line"></span><br><span class="line"> <span class="type">String</span> <span class="variable">url</span> <span class="operator">=</span> request.getURI().toString();</span><br><span class="line"> <span class="type">String</span> <span class="variable">params</span> <span class="operator">=</span> request.getQueryParams().toString();</span><br><span class="line"> <span class="type">String</span> <span class="variable">method</span> <span class="operator">=</span> request.getMethodValue();</span><br><span class="line"> <span class="type">String</span> <span class="variable">headers</span> <span class="operator">=</span> request.getHeaders().entrySet().stream()</span><br><span class="line"> .map(entry -> entry.getKey() + <span class="string">": ["</span> + String.join(<span class="string">";"</span>, entry.getValue()) + <span class="string">"]"</span>)</span><br><span class="line"> .collect(Collectors.joining(<span class="string">"\n\t"</span>));</span><br><span class="line"></span><br><span class="line"> <span class="type">StringBuilder</span> <span class="variable">builder</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">StringBuilder</span>();</span><br><span class="line"> builder.append(<span class="string">"****************************************请求路径:[{}]请求开始****************************************\n"</span>);</span><br><span class="line"> builder.append(<span class="string">"url: "</span> + url + <span class="string">"\n"</span>);</span><br><span class="line"> builder.append(<span class="string">"gateway_request_url: "</span> + exchange.getRequiredAttribute(GATEWAY_REQUEST_URL_ATTR) + <span class="string">"\n"</span>);</span><br><span class="line"> builder.append(<span class="string">"method: "</span> + method + <span class="string">"\n"</span>);</span><br><span class="line"> builder.append(<span class="string">"params: "</span> + params + <span class="string">"\n"</span>);</span><br><span class="line"> builder.append(<span class="string">"headers: \n{ \n"</span> + headers + <span class="string">" \n}\n"</span>);</span><br><span class="line"> log.info(String.valueOf(builder), url);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> Mono<Void> <span class="title function_">filter</span><span class="params">(ServerWebExchange exchange, GatewayFilterChain chain)</span> {</span><br><span class="line"></span><br><span class="line"> <span class="comment">//前置过滤</span></span><br><span class="line"> BaseContextHandler.getContextMap().put(<span class="string">"beginTime"</span>, Instant.now());</span><br><span class="line"> <span class="built_in">this</span>.startLogInfo(exchange);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> chain.filter(exchange);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> <span class="type">int</span> <span class="title function_">getOrder</span><span class="params">()</span> {</span><br><span class="line"> <span class="keyword">return</span> HIGHEST_PRECEDENCE;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<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></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.litianyi.supermall.gateway.filters;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.litianyi.supermall.gateway.context.BaseContextHandler;</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.cloud.gateway.filter.GatewayFilterChain;</span><br><span class="line"><span class="keyword">import</span> org.springframework.cloud.gateway.filter.GlobalFilter;</span><br><span class="line"><span class="keyword">import</span> org.springframework.core.Ordered;</span><br><span class="line"><span class="keyword">import</span> org.springframework.http.server.reactive.ServerHttpRequest;</span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Component;</span><br><span class="line"><span class="keyword">import</span> org.springframework.web.server.ServerWebExchange;</span><br><span class="line"><span class="keyword">import</span> reactor.core.publisher.Mono;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.time.Duration;</span><br><span class="line"><span class="keyword">import</span> java.time.Instant;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> <span class="keyword">static</span> org.springframework.cloud.gateway.support.ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR;</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> litianyi</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">@date</span> 2022/1/7 12:19 PM</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="meta">@Slf4j</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">GlobalEndLoggerFilter</span> <span class="keyword">implements</span> <span class="title class_">GlobalFilter</span>, Ordered {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">void</span> <span class="title function_">endLogInfo</span><span class="params">(ServerWebExchange exchange, <span class="type">long</span> time)</span> {</span><br><span class="line"> <span class="type">ServerHttpRequest</span> <span class="variable">request</span> <span class="operator">=</span> exchange.getRequest();</span><br><span class="line"> <span class="type">String</span> <span class="variable">url</span> <span class="operator">=</span> request.getURI().toString();</span><br><span class="line"> <span class="type">String</span> <span class="variable">attribute</span> <span class="operator">=</span> exchange.getRequiredAttribute(GATEWAY_REQUEST_URL_ATTR).toString();</span><br><span class="line"></span><br><span class="line"> <span class="type">StringBuilder</span> <span class="variable">builder</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">StringBuilder</span>();</span><br><span class="line"> builder.append(<span class="string">"****************************************请求路径:[{}]请求结束, 耗时:[{}]ms****************************************\n"</span>);</span><br><span class="line"> builder.append(<span class="string">"gateway_request_url: "</span> + attribute + <span class="string">"\n"</span>);</span><br><span class="line"> log.info(String.valueOf(builder), url, time);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> Mono<Void> <span class="title function_">filter</span><span class="params">(ServerWebExchange exchange, GatewayFilterChain chain)</span> {</span><br><span class="line"></span><br><span class="line"> <span class="comment">//后置过滤</span></span><br><span class="line"> <span class="type">Instant</span> <span class="variable">instant</span> <span class="operator">=</span> (Instant) BaseContextHandler.getContextMap().get(<span class="string">"beginTime"</span>);</span><br><span class="line"> endLogInfo(exchange, Duration.between(instant, Instant.now()).toMillis());</span><br><span class="line"> BaseContextHandler.remove();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> chain.filter(exchange);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Override</span></span><br><span class="line"> <span class="keyword">public</span> <span class="type">int</span> <span class="title function_">getOrder</span><span class="params">()</span> {</span><br><span class="line"> <span class="keyword">return</span> LOWEST_PRECEDENCE;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>这个类是为了获取运行时间，也可以使用其他方式获取运行时间。</p>
<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></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.litianyi.supermall.gateway.context;</span><br><span class="line"></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> litianyi</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">BaseContextHandler</span> {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> ThreadLocal<Map<String, Object>> threadContext = ThreadLocal.withInitial(() -> <span class="keyword">new</span> <span class="title class_">HashMap</span><>());</span><br><span class="line"></span><br><span class="line"> <span class="keyword">private</span> <span class="title function_">BaseContextHandler</span><span class="params">()</span> {</span><br><span class="line"></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 class="comment"> * 取得thread context Map的实例。</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> thread context Map的实例</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> Map<String, Object> <span class="title function_">getContextMap</span><span class="params">()</span> {</span><br><span class="line"> <span class="keyword">return</span> threadContext.get();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">remove</span><span class="params">()</span> {</span><br><span class="line"> getContextMap().clear();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h2 id="运行效果"><a href="#运行效果" class="headerlink" title="运行效果"></a>运行效果</h2><p><img src="https://img-blog.csdnimg.cn/c69ec7e6ab7944099c9df151305f7173.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAcXFfMzAwODczOTU=,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center"></p>
<h1 id="解决方法"><a href="#解决方法" class="headerlink" title="解决方法"></a>解决方法</h1><p>在使用 Gateway 的时候，不确定自己写的 predicates 和 filters 是否正确，想要知道经过 Gateway 过滤器后真正的请求是什么，有两种方法，一种是debug查看真实的url，另一种就是使用日志，把转发后的 url 打印出来。</p>
<h2 id="阅读源码："><a href="#阅读源码：" class="headerlink" title="阅读源码："></a>阅读源码：</h2><h3 id="对-RouteToRequestUrlFilter-进行-debug"><a href="#对-RouteToRequestUrlFilter-进行-debug" class="headerlink" title="对 RouteToRequestUrlFilter 进行 debug"></a>对 RouteToRequestUrlFilter 进行 debug</h3><p>从 GatewayAutoConfiguration 可以看到他运行了 RouteToRequestUrlFilter 类，这个类就是 Gateway 确定路由到哪个服务地址的类。<br><img src="https://img-blog.csdnimg.cn/4e0128f2d994453cae12dd14edc8277d.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAcXFfMzAwODczOTU=,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center"></p>
<p>进入这个类，进行debug<br><img src="https://img-blog.csdnimg.cn/a0ac565dcab243bda47dec4a13644d53.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAcXFfMzAwODczOTU=,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center"></p>
<blockquote>
<p>lb：load balancer 负载均衡</p>
</blockquote>
<p>可以看到，RouteToRequestUrlFilter 把确定了服务的 url 使用 GATEWAY_REQUEST_URL_ATTR 这个 key 保存到了 ServerWebExchange 对象的 Attributes 里。</p>
<p>接下来进入负载均衡过滤器</p>
<h3 id="对-LoadBalancerClientFilter-进行debug"><a href="#对-LoadBalancerClientFilter-进行debug" class="headerlink" title="对 LoadBalancerClientFilter 进行debug"></a>对 LoadBalancerClientFilter 进行debug</h3><p><img src="https://img-blog.csdnimg.cn/1b564e14129847de8544c5548e61cdb7.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAcXFfMzAwODczOTU=,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center"></p>
<p>经过负载均衡过滤器确定了真正要请求的url，然后又使用 GATEWAY_REQUEST_URL_ATTR 这个 key 存到了 ServerWebExchange 对象的 Attributes 里。</p>
<p>经过这一波操作，写日志的思路就有了。</p>
<h2 id="写日志："><a href="#写日志：" class="headerlink" title="写日志："></a>写日志：</h2><p>Gateway 的过滤器有两种，一种是<strong>全局过滤器</strong>，另一种是针对于 Router 的过滤器（Gateway提供了丰富的 router 过滤器，本文不涉及自定义这种过滤器）。<br>全局过滤器不需要工厂，也不需要配置，直接对所有的路由都生效。可以使用<strong>全局过滤器</strong>实现统一的权限验证、日志记录等希望对所有代理的项目都生效的内容，可以配置在全局过滤器中。<br>且在项目中可以配置多个<strong>全局过滤器</strong>的实现类，都可以自动执行。</p>
<h3 id="自定义的全局过滤器需要实现-GlobalFilter-和-Ordered。"><a href="#自定义的全局过滤器需要实现-GlobalFilter-和-Ordered。" class="headerlink" title="自定义的全局过滤器需要实现 GlobalFilter 和 Ordered。"></a>自定义的全局过滤器需要实现 GlobalFilter 和 Ordered。</h3><p>主要的日志逻辑可以写在需要实现的 GlobalFilter 下的 public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) 方法内。</p>
<blockquote>
<p>ServerWebExchange 类的解释： Contract for an HTTP request-response interaction. Provides access to the HTTP request and response and also exposes additional server-side processing related properties and features such as request attributes.<br>HTTP 请求-响应交互的契约。 提供对 HTTP 请求和响应的访问，还公开其他与服务器端处理相关的属性和功能，例如请求属性。</p>
</blockquote>
<p>Ordered 需要实现 public int getOrder() 方法。改方法返回一个int，表示这个filter的执行顺序。</p>
<blockquote>
<p>Ordered 类的解释： Ordered is an interface that can be implemented by objects that should be orderable, for example in a Collection.<br>The actual order can be interpreted as prioritization, with the first object (with the lowest order value) having the highest priority.<br>实际order可以解释为优先级，第一个对象（具有最低顺序值）具有最高优先级。</p>
</blockquote>
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title="Github"><i class="fab fa-github"></i></a><a class="social-icon" href="mailto:[email protected]" target="_blank" title="Email"><i class="fas fa-envelope"></i></a><a class="social-icon" href="https://blog.csdn.net/qq_30087395/" target="_blank" title="Csdn"><i class="fa-solid fa-rss"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">欢迎大家</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#%E5%85%88%E4%B8%8A%E4%BB%A3%E7%A0%81"><span class="toc-number">1.</span> <span class="toc-text">先上代码</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BB%A3%E7%A0%81%E7%BB%93%E6%9E%84%EF%BC%9A"><span class="toc-number">1.1.</span> <span class="toc-text">代码结构：</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%85%B7%E4%BD%93%E4%BB%A3%E7%A0%81"><span class="toc-number">1.2.</span> <span class="toc-text">具体代码</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E8%BF%90%E8%A1%8C%E6%95%88%E6%9E%9C"><span class="toc-number">1.3.</span> <span class="toc-text">运行效果</span></a></li></ol></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E8%A7%A3%E5%86%B3%E6%96%B9%E6%B3%95"><span class="toc-number">2.</span> <span class="toc-text">解决方法</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E9%98%85%E8%AF%BB%E6%BA%90%E7%A0%81%EF%BC%9A"><span class="toc-number">2.1.</span> <span class="toc-text">阅读源码：</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%AF%B9-RouteToRequestUrlFilter-%E8%BF%9B%E8%A1%8C-debug"><span class="toc-number">2.1.1.</span> <span class="toc-text">对 RouteToRequestUrlFilter 进行 debug</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%AF%B9-LoadBalancerClientFilter-%E8%BF%9B%E8%A1%8Cdebug"><span class="toc-number">2.1.2.</span> <span class="toc-text">对 LoadBalancerClientFilter 进行debug</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%86%99%E6%97%A5%E5%BF%97%EF%BC%9A"><span class="toc-number">2.2.</span> <span class="toc-text">写日志：</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%87%AA%E5%AE%9A%E4%B9%89%E7%9A%84%E5%85%A8%E5%B1%80%E8%BF%87%E6%BB%A4%E5%99%A8%E9%9C%80%E8%A6%81%E5%AE%9E%E7%8E%B0-GlobalFilter-%E5%92%8C-Ordered%E3%80%82"><span class="toc-number">2.2.1.</span> <span class="toc-text">自定义的全局过滤器需要实现 GlobalFilter 和 Ordered。</span></a></li></ol></li></ol></li></ol></div></div><div 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