JAVA高级面试进阶训练营视频教程

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1. 编写自定义异常类

package cn.jfjb.crud.exception;

/**
 * @author john
 * @date 2019/11/24 - 9:48
 */
public class UserNotExistException extends RuntimeException {
    public UserNotExistException() {
        super("用户不存在");
    }
}

2. 处理自测试异常

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;

/**
 * @author john
 * @date 2019/11/24 - 10:43
 */
@ControllerAdvice
public class MyExceptionHandler {

    @ResponseBody
    @ExceptionHandler(UserNotExistException.class)
    public Map<String, Object> handleException(Exception e) {
        Map<String, Object> map = new HashMap<>();
        map.put("code", "user.notexist");
        map.put("message", e.getMessage());
        return map;
    }
}

3. 配置application.yml文件(不配置的话无法获取exception)

server:
  error:
    include-exception: true

4. 编写测试

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;

/**
 * @author john
 * @date 2019/11/22 - 19:38
 */
@Controller
public class HelloController {
   
    @RequestMapping({"/testException"})
    public String testException(@RequestParam("user") String user) {
        if (user != "aaa") {
            throw new UserNotExistException();
        }
        return "index";
    }
}