全局异常和自定义异常处理

雨点打透心脏的1/2处 2024-02-05 21:09 111阅读 0赞

全局异常GlobalException.java，basePackages：controller层所在的包全路径

import com.guet.score_management_system.common.domian.AjaxResult;
    import org.springframework.web.bind.annotation.ControllerAdvice;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    /**
     * 全局异常处理
     */
    @ControllerAdvice(basePackages = "com.demo.controller")
    public class GlobalException {
        /**统一处理异常@ExceptionHandler，用于Exception*/
        /*  @ExceptionHandler(Exception.class)
        @ResponseBody
        public AjaxResult error(HttpServletRequest request,Exception e){
            return AjaxResult.error("系统异常");
        }*/
    
        /**ExceptionHandler用来捕获ServiceException异常*/
        @ExceptionHandler(ServiceException.class)
        /**将AjaxResult转为JSON对象*/
        @ResponseBody
        /**需要自定义一个类，用来继承RuntimeException*/
        public AjaxResult serviceException(ServiceException e){
            return AjaxResult.error("500",e.getMessage());
        }
    }

自定义异常ServiceException.java

public class ServiceException extends RuntimeException {
        /**
         * 异常信息
         */
        private String message;
    
        public ServiceException(String message) {
            this.message = message;
        }
    
        public String getMessage() {
            return message;
        }
    
        public void setMessage(String message) {
            this.message = message;
        }
    }

使用，任意controller类

public User login(User user) {
            /** 判断输入的用户名是否为空 */
            if (user.getUsername() == null || "".equals(user.getUsername())){
                throw new ServiceException("用户名不能为空");
            }
            /** 判断输入的密码是否为空 */
            if (user.getPassword() == null || "".equals(user.getPassword())){
                throw new ServiceException("密码不能为空");
            }
            /** 判断获取输入的用户名和密码与数据库中的是否对应 */
            User dbUser = userMapper.selectUsernameAndPassword(user.getUsername(), user.getPassword());
            if (dbUser == null){
                throw new ServiceException("用户名或密码错误");
            }
            return dbUser;
        }

前端

login() {
      request.post('/login', this.form).then(res => {
        if(res.code === '200'){
            this.$message.success('登录成功')
            // 跳转到首页
            this.$router.push('/')
        }else{
            this.$message.error(res.message)
         }
      })
    },

效果：

![3323a61277084e5f9372c3b781db44b0.png][]

![9e2b176c9b0541aeaf8e273a091db4f2.png][]

![dea648ad91804525b9ea36d2af7ba23a.png][]

[3323a61277084e5f9372c3b781db44b0.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/62227e13f76546a5acc11316164cfd54.png
[9e2b176c9b0541aeaf8e273a091db4f2.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/faa45f0c1ede41748f59e983c14a090a.png
[dea648ad91804525b9ea36d2af7ba23a.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/0dbe32b2db404568a5ca96e9bf4cd860.png