使用log4j MDC实现日志追踪

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
/**
 * 线程上下文
 *
 * @date 2017年3月1日
 * @since 1.0.0
 */
public class ThreadContext {
    /**
     * 线程上下文变量的持有者
     */
    private final static ThreadLocal<Map<String, Object>> CTX_HOLDER = new ThreadLocal<Map<String, Object>>();
    static {
        CTX_HOLDER.set(new HashMap<String, Object>());
    }
 
    /**
     * traceID
     */
    private final static String TRACE_ID_KEY = "traceId";
    /**
     * 会话ID
     */
    private final static String SESSION_KEY = "token";
    /**
     * 操作用户ID
     */
    private final static String VISITOR_ID_KEY = "userId";
    /**
     * 操作用户名
     */
    private final static String VISITOR_NAME_KEY = "userName";
    /**
     * 客户端IP
     */
    private static final String CLIENT_IP_KEY = "clientIp";
    /**
     * 添加内容到线程上下文中
     *
     * @param key
     * @param value
     */
    public final static void putContext(String key, Object value) {
        Map<String, Object> ctx = CTX_HOLDER.get();
        if (ctx == null) {
            return;
        }
        ctx.put(key, value);
    }
    /**
     * 从线程上下文中获取内容
     *
     * @param key
     */
    @SuppressWarnings("unchecked")
    public final static <T extends Object> T getContext(String key) {
        Map<String, Object> ctx = CTX_HOLDER.get();
        if (ctx == null) {
            return null;
        }
        return (T) ctx.get(key);
    }
    /**
     * 获取线程上下文
     */
    public final static Map<String, Object> getContext() {
        Map<String, Object> ctx = CTX_HOLDER.get();
        if (ctx == null) {
            return null;
        }
        return ctx;
    }
    /**
     * 删除上下文中的key
     *
     * @param key
     */
    public final static void remove(String key) {
        Map<String, Object> ctx = CTX_HOLDER.get();
        if (ctx != null) {
            ctx.remove(key);
        }
    }
    /**
     * 上下文中是否包含此key
     *
     * @param key
     * @return
     */
    public final static boolean contains(String key) {
        Map<String, Object> ctx = CTX_HOLDER.get();
        if (ctx != null) {
            return ctx.containsKey(key);
        }
        return false;
    }
    /**
     * 清空线程上下文
     */
    public final static void clean() {
        CTX_HOLDER.remove();
    }
    /**
     * 初始化线程上下文
     */
    public final static void init() {
        CTX_HOLDER.set(new HashMap<String, Object>());
    }
    /**
     * 设置traceID数据
     */
    public final static void putTraceId(String traceId) {
        putContext(TRACE_ID_KEY, traceId);
    }
    /**
     * 获取traceID数据
     */
    public final static String getTraceId() {
        return getContext(TRACE_ID_KEY);
    }
    /**
     * 设置会话的用户ID
     */
    public final static void putUserId(Integer userId) {
        putContext(VISITOR_ID_KEY, userId);
    }
    /**
     * 设置会话的用户ID
     */
    public final static int getUserId() {
        Integer val = getContext(VISITOR_ID_KEY);
        return val == null ? 0 : val;
    }
    /**
     * 设置会话的用户名
     */
    public final static void putUserName(String userName) {
        putContext(VISITOR_NAME_KEY, userName);
    }
    /**
     * 获取会话的用户名称
     */
    public final static String getUserName() {
        return Optional.ofNullable(getContext(VISITOR_NAME_KEY))
                .map(name -> String.valueOf(name))
                .orElse("");
    }
    /**
     * 取出IP
     *
     * @return
     */
    public static final String getClientIp() {
        return getContext(CLIENT_IP_KEY);
    }
    /**
     * 设置IP
     *
     * @param ip
     */
    public static final void putClientIp(String ip) {
        putContext(CLIENT_IP_KEY, ip);
    }
    /**
     * 设置会话ID
     *
     * @param token
     */
    public static void putSessionId(String token) {
        putContext(SESSION_KEY, token);
    }
    /**
     * 获取会话ID
     *
     * @param token
     */
    public static String getSessionId(String token) {
        return getContext(SESSION_KEY);
    }
    /**
     * 清空会话数据
     */
    public final static void removeSessionId() {
        remove(SESSION_KEY);
    }
}

import java.util.UUID;
import org.slf4j.MDC;
import ThreadContext;
/**
 * trace工具
 *
 * @date 2017年3月10日
 * @since 1.0.0
 */
public class TraceUtil {
    public static void traceStart() {
        ThreadContext.init();
        String traceId = generateTraceId();
        MDC.put('traceId', traceId);
        ThreadContext.putTraceId(traceId);
    }
    public static void traceEnd() {
        MDC.clear();
        ThreadContext.clean();
    }
    /**
     * 生成跟踪ID
     *
     * @return
     */
    private static String generateTraceId() {
        return UUID.randomUUID().toString();
    }
}

import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.web.filter.OncePerRequestFilter;
import com.pingan.manpan.common.util.TraceUtil;
import com.pingan.manpan.user.dto.ThreadContext;
import com.pingan.manpan.web.common.surpport.IpUtils;
/**
 * 上下文Filter
 *
 * @date 2017/3/10
 * @since 1.0.0
 */
//@Order 标记组件的加载顺序
@Order(Ordered.HIGHEST_PRECEDENCE)
public class ContextFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
                                    FilterChain filterChain) throws ServletException, IOException {
        try {
            ThreadContext.putClientIp(IpUtils.getClientIp(request));
            TraceUtil.traceStart();
            filterChain.doFilter(request, response);
        } finally {
            TraceUtil.traceEnd();
        }
    }
}

    /**
     * 请求上下文,应该在最外层
     *
     * @return
     */
    @Bean
    public FilterRegistrationBean requestContextRepositoryFilterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new ContextFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        return filterRegistrationBean;
    }

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <jmxConfigurator/>
    <property name="LOG_LEVEL_PATTERN" value="%X{traceId:-} %5p"/>
    <property name="LOG_FILE" value="${LOG_PATH}/web.logx"/>
    <property name="LOG_FILE_SUFFIX" value=".logx"/>
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    <include resource="org/springframework/boot/logging/logback/console-appender.xml"/>
    <appender name="FILE"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        <encoder>
            <pattern>${FILE_LOG_PATTERN}</pattern>
        </encoder>
        <file>${LOG_FILE}${LOG_FILE_SUFFIX}</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}${LOG_FILE_SUFFIX}</fileNamePattern>
        </rollingPolicy>
    </appender>
    <appender name="SYSLOG" class="ch.qos.logback.classic.net.SyslogAppender">
        <syslogHost>127.0.0.1</syslogHost>
        <facility>local6</facility>
        <port>514</port>
        <suffixPattern>${FILE_LOG_PATTERN}</suffixPattern>
    </appender>
    
    <logger name="druid.sql" level="DEBUG" />
    <root level="INFO">
        <appender-ref ref="CONSOLE"/>
        <appender-ref ref="FILE"/>
        <appender-ref ref="SYSLOG"/>
    </root>
</configuration>

Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: http://test.page.qingin.cn
Cache-Control: max-age=30
Connection: keep-alive
Content-Type: application/json;charset=UTF-8
Date: Tue, 11 Aug 2020 12:02:19 GMT
Expires: Tue, 11 Aug 2020 12:02:49 GMT
Server: nginx/1.16.1
traceID: c6019df137174d2b98631474db4156b7
Transfer-Encoding: chunked
Vary: Origin
Vary: Access-Control-Request-Method
Vary: Access-Control-Request-Headers

package com.generator.admin.filter;
import org.apache.logging.log4j.ThreadContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.UUID;
/**
 * @calssName Log4j2Filter
 * @Description 对用户的请求添加日志编号,并将此编号返回给前端，便于日志查询
 */
@WebFilter(filterName = "Log4j2Filter", urlPatterns = "/*", initParams = {@WebInitParam(name = "DESCRIPTION", value = "这是Log4j2Filter过滤器")})
public class Log4j2Filter implements Filter {
    private String description;
    public static final String TRACE_ID = "traceID";
    private static final Logger logger = LoggerFactory.getLogger(Log4j2Filter.class);
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        description = filterConfig.getInitParameter("DESCRIPTION");
        System.out.println("过滤器初始化:"+ description);
    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException,ServletException {
            
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;
        
        // 生成一个随机数给到前端
        String traceId = UUID.randomUUID().toString().replace("-", "");
        // 随机数放到此线程的上下文中，可以在每条日志前加入。具体看下面log4j2.xml
        ThreadContext.put(TRACE_ID, traceId);
        // 随机数放到Header中，在Response Headers中可查看到此数据
        resp.addHeader(TRACE_ID, traceId);  
        filterChain.doFilter(req, resp);
        ThreadContext.clearAll();
    }
    @Override
    public void destroy() {
        System.out.println("过滤器，被销毁："+ description);
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<!--设置log4j2的自身log级别为warn-->
<!--日志级别以及优先级排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL -->
<!--Configuration后面的status，这个用于设置log4j2自身内部的信息输出，可以不设置,当设置成trace时，你会看到log4j2内部各种详细输出-->
<!--monitorInterval：Log4j能够自动检测修改配置 文件和重新配置本身，设置间隔秒数-->
<configuration status="warn" monitorInterval="30">
    
    <!--全局参数-->
    <Properties>
        <Property name="logPath">logs</Property>
    </Properties>
    
    <!--先定义所有的appender-->
    <appenders>
        <!--这个输出控制台的配置-->
        <console name="Console" target="SYSTEM_OUT">
            <!-- traceID:就是在过滤器中生成的随机数 -->
            <PatternLayout pattern="[traceID:%X{traceID}]-[%d{yyyy-MM-dd HH:mm:ss:SSS}]-[%t]-[%p]-[%l]-%m%n"/>
        </console>
    </appenders>
    <!--然后定义logger，只有定义了logger并引入的appender，appender才会生效-->
    <loggers>
        <!--过滤掉spring和mybatis的一些无用的debug信息-->
        <logger name="org.springframework" level="INFO"></logger>
        <logger name="org.mybatis" level="INFO"></logger>
        <logger name="com.zaxxer" level="WARN"></logger>
        <!-- com.generator开发/测试环境用DEBUG,并用控制台输出即可 -->
        <logger name="com.generator" level="DEBUG" additivity="false">
            <appender-ref ref="Console"/>
        </logger>
        <!-- 未指定的包都按此 level 打印日志 -->
        <root level="DEBUG">
            <appender-ref ref="Console"/>
        </root>
    </loggers>
</configuration>