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Xiaobian to share with you how to use SpringBoot+Logback to achieve link tracking function, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

First, the realization principle

Spring Boot uses the LogBack log system by default, and the relevant jar package has been introduced, so we can use LogBack to print logs without any configuration.

MDC (Mapped Diagnostic Context, mapping debug context) is a function provided by log4j and logback to facilitate logging under multithreaded conditions.

The idea of implementation is that at the beginning of a request, add the context information related to the request (such as customer ID, customer IP address, sessionId, request parameters, etc.) to MDC, and then configure logback-spring.xml, then the Logback component will print out the information stored in MDC in each log, thus realizing all the operations of an ID through the user.

II. Code practice

To create a new spring boot project spring-boot-log, follow these steps.

Create a new log interceptor

The log interceptor gets the user's sessionId at the beginning of the request. Of course, it can also generate a UUID and store it in MDC.

The SessionInterceptor code is as follows:

/ * Log interceptor * @ Author: Java fragmentation * * / public class SessionInterceptor extends HandlerInterceptorAdapter {/ * * session ID * / private final static String SESSION_KEY = "sessionId"; @ Override public void postHandle (HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3) throws Exception {} @ Override public boolean preHandle (HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {/ / String token = UUID.randomUUID (). ToString (). ReplaceAll ("-", ") / / this example test uses sessionId, or you can use String token such as UUID = request.getSession (). GetId (); MDC.put (SESSION_KEY, token); return true;} @ Override public void afterCompletion (HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3) throws Exception {/ / delete MDC.remove (SESSION_KEY);}}

Create a new configuration class

Create a new InterceptorConfig and register the log interceptor you just had.

The InterceptorConfig code is as follows:

@ Configurationpublic class InterceptorConfig implements WebMvcConfigurer {@ Bean public SessionInterceptor getSessionInterceptor () {return new SessionInterceptor ();} @ Override public void addInterceptors (InterceptorRegistry registry) {registry.addInterceptor (getSessionInterceptor ()) .addPathPatterns ("/ *");}

Modify logback-spring.xml

Configure logback-spring.xml to obtain the sessionId added by the log interceptor and print it to the log. The configuration file can be obtained as follows:

% X {sessionId}

In this example, sessionId is printed to the console and file. The complete configuration is as follows:

% date [% thread] [% X {sessionId}]%-5level% logger {80} -% msg%n ${log.base} .log ${log.base}.% d {yyyy-MM-dd} .log.zip% date [% thread] [% X {sessionId}]%-5level% logger {80} -% msg%n

Add controller

Create a new TestLogController and print the log.

The code is as follows:

@ RestControllerpublic class TestLogController {Logger log = LoggerFactory.getLogger (getClass ()); / * * Test login * / @ RequestMapping (value = "/ testLogin") public String testLogin () {log.info ("user logged in successfully!") ; return "ok";} / * * Test issue order * / @ RequestMapping (value = "/ testNewOrder") public String testNewOrder () {log.info ("user created order!") ; log.info ("request completed, return ok!") ; return "ok";} / * * Test purchase * / @ RequestMapping (value = "/ testPay") public String testPay () {log.info ("user pays!") ; return "ok";}}

III. Testing

Open the browser continuous access interfaces testLogin, testNewOrder and testPay to simulate user login, order placing, and payment operations. The log printed in the console and file already contains sessonId information. The printed result is as follows:

[http-nio-8888-exec-1] [CB8E7DB250A31F2BE6C05B30633B9A95] INFO com.example.springbootlog.controller.TestLogController-user logged in successfully! [http-nio-8888-exec-2] [CB8E7DB250A31F2BE6C05B30633B9A95] INFO com.example.springbootlog.controller.TestLogController-the user created the order! [http-nio-8888-exec-2] [CB8E7DB250A31F2BE6C05B30633B9A95] INFO com.example.springbootlog.controller.TestLogController-request completed, return ok! [http-nio-8888-exec-3] [CB8E7DB250A31F2BE6C05B30633B9A95] INFO com.example.springbootlog.controller.TestLogController-user payment!

The above is all the contents of the article "how to use SpringBoot+Logback to achieve link tracking". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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