LogBack通过MDC实现日志记录区分用户Session

1.首先实现一个interceptor,在请求开始的时候MDC put一个Session标志,interceptor结束的时候remove掉

public class SessionInterceptor implements HandlerInterceptor {
    /**
     * 会话ID
     */
    private final static String SESSION_KEY = "sessionId";

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object handler) throws Exception {
        // 放SessionId
        String token = UUID.randomUUID().toString();
        MDC.put(SESSION_KEY, token);

        return true;
    }

    public void postHandle(HttpServletRequest request, HttpServletResponse response,
                           Object handler, ModelAndView modelAndView) throws Exception {

    }

    public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
                                Object handler, Exception ex) throws Exception {
        // 删除
        MDC.remove(SESSION_KEY);
    }
}

2.然后在logback相应的配置中加上seesionId的配置就可以了

 <pattern> %X{sessionId} %date [%thread] %-5level %logger{80} - %msg%n</pattern>

MDC中的值在logback.xml文件中的pattern中用%X{key}来引用！