Spring-全局异常处理-@RestControllerAdvice

@RestControllerAdvice是复合注解
@ControllerAdvice
@ResponseBody

import org.springframework.web.bind.annotation.RestControllerAdvice;

作用：对Controller进行增强，两者搭配，常做全局异常处理

@ControllerAdvice 作用在类上，有三种用法

• 全局异常处理： @ModelAttribute
• 全局数据绑定： @ModelAttribute
• 全局数据预处理： @InitBinder

1. 全局异常处理

@RestControllerAdvice
public class GlobalExceptionDeal {
	@ExceptionHandler(NullPointerException.class)
	@ResponseStatus(value = HttpStatus.INTERNAL_SERVER_ERROR)
	public ResponseBean dealNullPointerException() {
		ResponseBean responseBean = new ResponseBean(500,"服务器异常--空指针异常");
		return responseBean;
	}
	@ExceptionHandler(Exception.class)
	@ResponseStatus(value=HttpStatus.INTERNAL_SERVER_ERROR)
	public ResponseBean dealUnexpectedException(){
		ResponseBean responseBean=new ResponseBean(505,"服务器异常--未知错误");
		return responseBean;
	}
}