一、日志配置记录

• 日志组件

  日志门面	日志实现	桥接方式	改变依赖
  slf4j	Logback	slf4j-log4j12	jcl-over-slf4j
  commons-logging	Log4j	slf4j-jdk14	log4j-over-slf4j
  Log4j	Log4j2
  	Java util logging

二、MDC具体应用

• 配置开启MDC【Mapped Diagnostic Contexts】

  • 默认没有开启，需要手动设置LogMDC.setMDCEnable(true)
  • 配置logback.xml日志模板 %X
  • 流程只有执行过程出现异常时才会记录MDC信息

• 实现方式

  • 一般情况，MDC只有在流程出现错误的情况，才会被捕获，打印到控制台。

  • 可以使用拦截器的方式，来捕获MDC日志。

• 代码实现

  • 使用拦截器

        package com.laogoubi.interceptor;
    
        import org.activiti.engine.impl.agenda.AbstractOperation;
        import org.activiti.engine.impl.interceptor.DebugCommandInvoker;
        import org.activiti.engine.logging.LogMDC;
        import org.slf4j.Logger;
        import org.slf4j.LoggerFactory;
    
        /**
         * @ClassName MDCCommandInvoker
         * @Description 捕获MDC日志
         * @Author eastern
         * @Date 2020/6/28 下午11:10
         * @Version 1.0
         **/
        public class MDCCommandInvoker extends DebugCommandInvoker {
    
          private static final Logger logger = LoggerFactory.getLogger(MDCCommandInvoker.class);
    
          @Override
          public void executeOperation(Runnable runnable) {
            // 获取LogMDC的状态
            boolean mdcEnabled = LogMDC.isMDCEnabled();
            // 无论是否打开，都打开
            LogMDC.setMDCEnabled(true);
    
            if (runnable instanceof AbstractOperation) {
              AbstractOperation operation = (AbstractOperation) runnable;
    
              if (operation.getExecution() != null) {
                // 将可执行的对象放到上下文中
                LogMDC.putMDCExecution(operation.getExecution());
              }
            }
            // 执行正常的业务操作
            super.executeOperation(runnable);
            // 清除上下文
            LogMDC.clear();
            // 还原现场，如果进来之前是不生效的，设置回原来的值
            if (!mdcEnabled) {
              LogMDC.setMDCEnabled(false);
            }
          }
    }

  • xml配置activiti_mdc.cfg.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans.xsd">
    
        <bean id="processEngineConfiguration" class="org.activiti.engine.impl.cfg.StandaloneInMemProcessEngineConfiguration">
          <property name="commandInvoker" ref="commandInvoker"/>
        </bean>
      <bean id="commandInvoker" class="com.laogoubi.interceptor.MDCCommandInvoker"></bean>
    </beans>

  • 日志依赖

    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>1.1.11</version>
    </dependency>

    配置：logback.xml

    <?xml version="1.0" encoding="UTF-8"?>
    
      <configuration>
          <property name="encoding" value="UTF-8"></property>
          <property name="mdc" value="%d{HH:mm:ss.SSS}[%thread][%-5level]%msg  ProcessDefinitionId=%X{mdcProcessDefinitionID} executionId=%X{mdcExecutionId}
      mdcProcessInstanceID=%X{mdcProcessInstanceID} mdcBusinessKey=%X{mdcBusinessKey} %logger{10}.%M:%L%n"></property>
          <appender name="consoleLog" class="ch.qos.logback.core.ConsoleAppender">
      <!--        <layout class="ch.qos.logback.classic.PatternLayout">-->
      <!--            &lt;!&ndash;输入合适&ndash;&gt;-->
      <!--            <pattern>-->
      <!--                %d - %msg%n-->
      <!--            </pattern>-->
      <!--        </layout>-->
              <encoder>
                  <pattern>${mdc}</pattern>
                  <charset>${encoding}</charset>
              </encoder>
        </appender>
    
          <appender name="fileInfoLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
              <!--过滤-->
              <filter class="ch.qos.logback.classic.filter.LevelFilter">
                  <level>ERROR</level>
                  <!--禁止-->
                  <onMatch>DENY</onMatch>
                  <!--接受-->
                  <onMismatch>ACCEPT</onMismatch>
              </filter>
              <encoder>
                  <pattern>
                      %msg%n
                  </pattern>
              </encoder>
              <!--滚动策略-->
              <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                  <!--路径-->
                  <fileNamePattern>/Users/xxx/IdeaProjects/activiti-study/info.%d.log</fileNamePattern>
              </rollingPolicy>
        </appender>
    
          <appender name="fileErrorLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
              <!--过滤-->
              <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
                  <level>ERROR</level>
              </filter>
              <encoder>
                  <pattern>
                      %msg%n
                  </pattern>
              </encoder>
              <!--滚动策略-->
              <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                  <!--路径-->
                  <fileNamePattern>/Users/xxx/IdeaProjects/activiti-study/error.%d.log</fileNamePattern>
              </rollingPolicy>
        </appender>
    
          <root level="info">
              <appender-ref ref="consoleLog"></appender-ref>
              <appender-ref ref="fileInfoLog"></appender-ref>
              <appender-ref ref="fileErrorLog"></appender-ref>
          </root>
      </configuration>