日志追踪（MDC）

1.maven依赖

<dependency>
   <groupId>org.slf4j</groupId>
   <artifactId>slf4j-log4j12</artifactId>
   <version>1.7.25</version>
</dependency>

2.log4j.properties

log4j.rootLogger = info, stdout

log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} API_NAME:[%X{API_NAME}] UUID:[%X{UUID}] [ %t:%r ] - [ %p ]  %m%n

3.Log4jUtils

public class Log4jUtils {
    private static final Logger LOGGER = LoggerFactory.getLogger(Log4jUtils.class);

    private static final Map<String, String> TAGS = new HashMap<>();

    static {
        try {
            TAGS.put("API_NAME", "SpringBoot-demo");
        } catch (Exception e) {
            throw new RuntimeException("init mdc tags error.", e);
        }
    }

    public Log4jUtils() {
    }

    public static void initGlobalMDC() {
        Iterator<Entry<String, String>> iterator = TAGS.entrySet().iterator();
        while(iterator.hasNext()) {
            Entry<String, String> entry = iterator.next();
            MDC.put(entry.getKey(), entry.getValue());
        }
    }
}

4.Log4jFilter

public class Log4jFilter implements Filter {
    private static final Logger LOGGER = LoggerFactory.getLogger(Log4jFilter.class);

    public Log4jFilter() {
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        LOGGER.info("Log4jFilter init.");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        Log4jUtils.initGlobalMDC();
        MDC.put("UUID", UUID.randomUUID().toString());
        try {
            chain.doFilter(request, response);
        } finally {
            MDC.clear();
        }
    }

    @Override
    public void destroy() {
        LOGGER.info("Log4jFilter destroy.");
    }
}

5.WebFilterConfig

@Configuration
public class WebFilterConfig {
    @Bean
    public FilterRegistrationBean log4jFilterRegistrationBean() {
        FilterRegistrationBean<Log4jFilter> registrationBean = new FilterRegistrationBean<>();
        registrationBean.setName("log4jFilter");
        Log4jFilter log4jFilter = new Log4jFilter();
        registrationBean.setFilter(log4jFilter);
        registrationBean.setOrder(0);
        return registrationBean;
    }
}

6.测试

@RestController
public class TestController {
    private static final Logger LOGGER = LoggerFactory.getLogger(TestController.class);

    @RequestMapping("/test")
    @ResponseBody
    public void test() {
        LOGGER.info("test");
    }


    @RequestMapping("/sub_thread_test")
    @ResponseBody
    public void subThreadTest() {
        LOGGER.info("sub_thread_test");
        new Thread(() -> LOGGER.info("sub_thread_test run.")).start();
    }
}

日志如下：
2018-12-07 15:21:52 API_NAME:[SpringBoot-demo] UUID:[df3e0d89-b547-48af-a7a7-d5aa1df4cd73] [ http-nio-8080-exec-5:11626 ] - [ INFO ]  test
2018-12-07 15:22:20 API_NAME:[SpringBoot-demo] UUID:[483a0d14-9f98-4dbd-a312-1bd25f022401] [ http-nio-8080-exec-8:39609 ] - [ INFO ]  sub_thread_test
2018-12-07 15:22:20 API_NAME:[SpringBoot-demo] UUID:[483a0d14-9f98-4dbd-a312-1bd25f022401] [ Thread-13:39625 ] - [ INFO ]  sub_thread_test run.

注意：System.setProperty("log4j2.isThreadContextMapInheritable", "true") 别忘了它

源码：https://gitee.com/jsjack_wang/springboot-demo dev-mdc分支

猜你喜欢