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In this article Xiaobian for you to introduce in detail "how to handle custom exceptions and return json in Springboot2.0", the content is detailed, the steps are clear, and the details are handled properly. I hope that this article "how to handle custom exceptions and return json in Springboot2.0" can help you solve your doubts.

1. Write custom exception classes

Package cn.jfjb.crud.exception;public class UserNotExistException extends RuntimeException {public UserNotExistException () {super ("user does not exist");}}

two。 Handling self-test exceptions

Package cn.jfjb.crud.handler;import cn.jfjb.crud.exception.UserNotExistException;import org.springframework.web.bind.annotation.ControllerAdvice;import org.springframework.web.bind.annotation.ExceptionHandler;import org.springframework.web.bind.annotation.ResponseBody;import java.util.HashMap;import java.util.Map;@ControllerAdvicepublic class MyExceptionHandler {@ ResponseBody @ ExceptionHandler (UserNotExistException.class) public Map handleException (Exception e) {Map map = new HashMap (); map.put ("code", "user.notexist") Map.put ("message", e.getMessage ()); return map;}}

3. Configure application.yml file (exception cannot be obtained without configuration)

Server: error: include-exception: true

4. Write tests

Package cn.jfjb.crud.controller;import cn.jfjb.crud.exception.UserNotExistException;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;@Controllerpublic class HelloController {@ RequestMapping ({"/ testException"}) public String testException (@ RequestParam ("user") String user) {if (user! = "aaa") {throw new UserNotExistException ();} return "index";}}

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