@ControllerAdvice全局处理异常

短命女 2022-11-13 00:50 180阅读 0赞

@ControllerAdvice，是Spring3.2提供的新注解,它是一个Controller增强器,可对controller中被 @RequestMapping注解的方法加一些逻辑处理。最常用的就是异常处理

## 统一异常处理 ##

需要配合@ExceptionHandler使用。  
当将异常抛到controller时,可以对异常进行统一处理,规定返回的json格式或是跳转到一个错误页面

//全局异常捕捉处理
    @ControllerAdvice
    public class CustomExceptionHandler {
    
        @ResponseBody
        @ExceptionHandler(value = Exception.class)
        public Map errorHandler(Exception ex) {
            Map map = new HashMap();
            map.put("code", 400);
            //判断异常的类型,返回不一样的返回值
            if(ex instanceof MissingServletRequestParameterException){
                map.put("msg","缺少必需参数："+((MissingServletRequestParameterException) ex).getParameterName());
            }
            else if(ex instanceof MyException){
                map.put("msg","这是自定义异常");
            }
            return map;
        }
    }

//自定义异常类
    @Data
    public class MyException extends RuntimeException {
        private long code;
        private String msg;
    
        public MyException(Long code, String msg){
            super(msg);
            this.code = code;
            this.msg = msg;
        }
    
        public MyException(String msg){
            super(msg);
            this.msg = msg;
        }
    }
    @RestController
    public class TestController {
        @RequestMapping("testException")
        public String testException() throws Exception{
            throw new MissingServletRequestParameterException("name","String");
        }
    
        @RequestMapping("testMyException")
        public String testMyException() throws MyException{
            throw new MyException("i am a myException");
        }
    }