SpringBoot(6) SpringBoot配置全局异常

1、全局异常

@ControllerAdvice 如果是返回json数据 则用 RestControllerAdvice,就可以不加 @ResponseBody
//捕获全局异常,处理所有不可知的异常
@ExceptionHandler(value=Exception.class)

 @RestControllerAdvice
 public class CustomExtHandler {

     private static final Logger LOG = LoggerFactory.getLogger(CustomExtHandler.class);

     //捕获全局异常,处理所有不可知的异常
     @ExceptionHandler(value=Exception.class)
     Object handleException(Exception e,HttpServletRequest request){
         LOG.error("url {}, msg {}",request.getRequestURL(), e.getMessage());
         Map<String, Object> map = new HashMap<>();
             map.put("code", 100);
             map.put("msg", e.getMessage());
             map.put("url", request.getRequestURL());
             return map;
     }

 }

2、自定义异常类型

自定义异常类型MyException

 /*
  * 功能描述: 建立自定义异常类 -- 继承运行异常最高类
  *
  * */

 public class MyException extends RuntimeException{

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

     private String code;
     private String 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;
     }

 }

修改CustomExtHandler

 @RestControllerAdvice
 public class CustomExtHandler {

     private static final Logger LOG = LoggerFactory.getLogger(CustomExtHandler.class);

     //捕获全局异常,处理所有不可知的异常
     @ExceptionHandler(value=Exception.class)
     Object handleException(Exception e,HttpServletRequest request){
         LOG.error("url {}, msg {}",request.getRequestURL(), e.getMessage());
         Map<String, Object> map = new HashMap<>();
             map.put("code", 100);
             map.put("msg", e.getMessage());
             map.put("url", request.getRequestURL());
             return map;
     }

     /**
      * 功能描述: 处理自定义异常类
      * @return
      *
      */
     @ExceptionHandler(value = MyException.class)
     Object handleMyException(MyException e, HttpServletRequest request){
         //进行页面跳转
 //        ModelAndView modelAndView = new ModelAndView();
 //        modelAndView.setViewName("error.html");
 //        modelAndView.addObject("msg", e.getMessage());
 //        return modelAndView;

         //f返回json数据
         Map<String, Object> map = new HashMap<>();
         map.put("code", e.getCode());
         map.put("msg", e.getMessage());
         map.put("url", request.getRequestURL());
         return map;
     }
 }

模拟一个异常实现页面跳转

 /**
  * 功能描述: 模拟自定义异常
  * @return
  */
 @RequestMapping(value = "/api/v1/myext")
 public Object myext() {
     throw new MyException("500", "my ext异常");
 }
     

最后梳理顺序：

　　首先，建立自定义异常类 MyException，继承于RuntimeException。如果出异常，在@RestControllerAdvice注释下的CustomExtHandler里面捕获，根据异常种类进行处理。

异常处理的官网地址： https://docs.spring.io/spring-boot/docs/2.1.0.BUILD-SNAPSHOT/reference/htmlsingle/#boot-features-error-handling