目标：springboot全局异常捕获

概述

1、自定义异常处理

package com.itheima.exeception;

/** * @Author David老师 * @Description * @Tel/微信：***** * @Version 1.0 **/public class BussinssException extends  RuntimeException {

    private String code;    private String msg;

    public BussinssException(String code,String msg){        this.code = code;        this.msg = msg;    }

    public String getCode() {        return code;    }

    public void setCode(String code) {        this.code = code;    }

    public String getMsg() {        return msg;    }

    public void setMsg(String msg) {        this.msg = msg;    }}

2：自定义异常

package com.itheima.exeception;

import org.springframework.stereotype.Controller;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 David老师 * @Description * @Tel/微信：150******37 * @Version 1.0 **/@ControllerAdvicepublic class MyControllerAdvice {

    /*     * @Author David老师     * @Tel/微信：150****37     * @Description 所有的全局异常，只要作用在@RequestMapping方法上，所有的异常信息都会被捕获到。     * @Date 16:57 2019/5/29     * @Param [ex]     * @return java.util.Map     **/    @ResponseBody    @ExceptionHandler(value = Exception.class)    public Map errorHandler( Exception ex){        Map map = new HashMap<>();        map.put("code",-1);        map.put("msg",ex.getMessage());        return map;    }    @ResponseBody    @ExceptionHandler(value = BussinssException.class)    public Map errorHandler2( BussinssException ex){        Map map = new HashMap<>();        map.put("code",ex.getCode());        map.put("msg",ex.getMsg());        return map;    }}

3：UserServiceImpl

@Override@Transactionalpublic int saveUser(User user) {    try{        return userDao.saveUser(user);//取钱    }catch(Exception ex){        throw  new BussinssException("409","保存用户失败，请检查");    }}

测试

package com.itheima.web;

import com.itheima.exeception.BussinssException;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.core.env.Environment;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;

/** * @Author David老师 * @Description * @Tel/微信：150*****37 * @Version 1.0 **/@RestControllerpublic class UserController {

   @Autowired    private IUserService userService;

      /**     * 保存用户     * @param user     */    @PostMapping("/saveUser")    public int saveUser(User user){        return userService.saveUser(user);    }

}

使用postman访问：

http://localhost:8081/saveUser?username=zhangsan&password=23w4e5r65t7y8

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