springboot全局异常处理

@ControllerAdvice
public class GlobalExceptionHandler {

private Map<String, String> map = null ;

/**
* 空指针异常报错  404
* @return
*/
@ExceptionHandler(value=NullPointerException.class)
@ResponseBody
public Map<String, String> nullPointerException(){
map = new HashMap<>();
map.put("error", "404");
return map;
}

@ExceptionHandler(value=Exception.class)
@ResponseBody
public Map<String, String> Exception(){
map = new HashMap<>();
map.put("error", "500");
return map;
}

}