60 lines
2.8 KiB
Markdown
60 lines
2.8 KiB
Markdown
## 通过扩展log4j或log4j2，在应用日志中，显示trace-id
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### log4j
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- 编译并发布skywalking-log/log4j-1.x-plugin,或通过公网仓库[https://dl.bintray.com/wu-sheng/skywalking](https://dl.bintray.com/wu-sheng/skywalking)下载。
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[  ](https://bintray.com/wu-sheng/skywalking/com.ai.cloud.skywalking-log4j-1.x-plugin/_latestVersion)
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```xml
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<dependency>
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<groupId>com.ai.cloud</groupId>
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<artifactId>skywalking-log4j-1.x-plugin</artifactId>
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<version>{lastest-version}</version>
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</dependency>
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```
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- 配置log4j配置文件
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```properties
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log4j.appender.A1.layout=com.ai.cloud.skywalking.plugin.log.log4j.v1.x.TraceIdPatternLayout
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#%x为traceid的转义符
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log4j.appender.A1.layout.ConversionPattern=[%x] %-d{yyyy-MM-dd HH:mm:ss.SSS} %c %n[%p] %n%m%n
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```
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### log4j2
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- 编译并发布skywalking-log/log4j-2.x-plugin,或通过公网仓库[https://dl.bintray.com/wu-sheng/skywalking](https://dl.bintray.com/wu-sheng/skywalking)下载。
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[  ](https://bintray.com/wu-sheng/skywalking/com.ai.cloud.skywalking-log4j-2.x-plugin/_latestVersion)
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- 引用所需的日志插件
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```xml
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<dependency>
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<groupId>com.ai.cloud</groupId>
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<artifactId>skywalking-log4j-2.x-plugin</artifactId>
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<version>{lastest-version}</version>
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</dependency>
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```
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- 配置log4j2配置文件
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```xml
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<!--%tid为traceid的转义符-->
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<PatternLayout pattern="%d{HH:mm:ss.SSS} [%tid] [%t] %-5level %logger{36} - %msg%n"/>
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```
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- 日志示例
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```
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#tid:N/A，代表环境设置不正确或监控已经关闭
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#tid: ,代表测试当前访问不在监控范围
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#tid:1.0a2.1453065000002.c3f8779.27878.30.184，标识此次访问的tid信息，示例如下
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[DEBUG] Returning handler method [public org.springframework.web.servlet.ModelAndView com.ai.cloud.skywalking.example.controller.OrderSaveController.save(javax.servlet.http.HttpServletRequest)] TID:1.0a2.1453192613272.2e0c63e.11144.58.1 2016-01-19 16:36:53.288 org.springframework.beans.factory.support.DefaultListableBeanFactory
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```
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## 如何在追踪日志中记录日志上下文
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- 使用sky walking提供的专用API，可以将日志保存到追踪日志中。示例如下：
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```java
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String businessKey = "phoneNumber:" + phoneNumber + ",resourceId:" + resourceId + ",mail:" + mail;
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BusinessKeyAppender.setBusinessKey2Trace(businessKey);
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```
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## 如何在代码中获取traceid
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- 通过API获取traceid
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```java
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Tracing.getTraceId();
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```
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## 还有其他方式获取traceid么？
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- 通过web应用的http调用入口，通过返回的header信息，找到此次调用的traceid。前提：此web应用的url，已经使用skywalking进行监控。
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