[Java知识库]skywalking向前端页面返回traceId

没有使用链路跟踪时，页面报错都是要到日志里定位，在分布式部署的项目中，还是比较麻烦的。项目中链路跟踪本人选型了skywalking，为了方便定位页面问题，实现了web界面reponse中返回skywalking的traceId，不多说直接上代码实现。

1、pom.xml引入

 <dependency>
     <groupId>org.apache.skywalking</groupId>
     <artifactId>apm-toolkit-trace</artifactId>
     <version>8.7.0</version>
 </dependency>

2、TraceResponseFilter.java

package net.grandhonor.framework.boot.tools.skywalking;

import org.apache.skywalking.apm.toolkit.trace.TraceContext;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 设置skywalking的traceId到response请求头
 *
 * @author wangfenglei
 */
@ConditionalOnProperty(value = "grandhonor.base.tools.skywalking.switch", havingValue = "true", matchIfMissing = false)
@Component
public class TraceResponseFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                                    FilterChain filterChain) throws ServletException, IOException {
        try{
            //设置skywalking的traceId
            httpServletResponse.addHeader("traceId", TraceContext.traceId());
        }catch (Exception e){}

        filterChain.doFilter(httpServletRequest, httpServletResponse);
    }

}

说明：本人对常见的中间件做了封装，skywalking也设置了开启开关，通过@ConditionalOnProperty控制，只有开关打开配置才生效。

3、效果展示

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