1. Write a custom exception class
package cn.jfjb.crud.exception; public class UserNotExistException extends RuntimeException { public UserNotExistException() { super("用户不存在"); } }
2. Handle 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; @ControllerAdvice public class MyExceptionHandler { @ResponseBody @ExceptionHandler(UserNotExistException.class) public Map<string> handleException(Exception e) { Map<string> map = new HashMap(); map.put("code", "user.notexist"); map.put("message", e.getMessage()); return map; } }</string></string>
3. Configure the application.yml file (exceptions 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; @Controller public class HelloController { @RequestMapping({"/testException"}) public String testException(@RequestParam("user") String user) { if (user != "aaa") { throw new UserNotExistException(); } return "index"; } }
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