java培训课程之异常处理_ResponseStatusExceptionResolver

在异常及异常父类中找到 @ResponseStatus 注解，然后使用这个注解的属性进行处理。
定义一个 @ResponseStatus 注解修饰的异常类
若在处理器方法中抛出了上述异常：若ExceptionHandlerExceptionResolver 不解析上述异常。由于触发的异常 UnauthorizedException 带有@ResponseStatus 注解。因此会被ResponseStatusExceptionResolver 解析到。最后响应UNAUTHORIZED 代码给客户端。HttpStatus.UNAUTHORIZED 代表响应码401，无权限。关于其他的响应码请参考 HttpStatus 枚举类型源码。

org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver

Implementation of the HandlerExceptionResolver interface that uses the @ResponseStatus annotation to map exceptions to HTTP status codes.

This exception resolver is enabled by default in the

org.springframework.web.servlet.DispatcherServlet.

1 实验代码

页面链接

<a href=”testResponseStatusExceptionResolver?i=10″>testResponseStatusExceptionResolver</a>

自定义异常类

package com.atguigu.springmvc.exception;

import org.springframework.http.HttpStatus;

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

/**

* 自定义异常类

HttpStatus.FORBIDDEN 不允许的，禁用的

@ResponseStatus(value=HttpStatus.FORBIDDEN,reason=”用户名称和密码不匹配“)

public class UsernameNotMatchPasswordException extends RuntimeException{}

控制器方法

@RequestMapping(value=”/testResponseStatusExceptionResolver”)

public String testResponseStatusExceptionResolver(@RequestParam(“i”) int i){

if(i==13){

throw new UsernameNotMatchPasswordException();

}

System.out.println(“testResponseStatusExceptionResolver…”);

return “success”;

}

出现的错误消息
没使用注解时：@ResponseStatus(value=HttpStatus.FORBIDDEN,reason=”用户名称和密码不匹配“)

Java培训

使用注解时：@ResponseStatus(value=HttpStatus.FORBIDDEN,reason=”用户名称和密码不匹配“)

java培训

测试在方法上使用注解

@ResponseStatus(value=HttpStatus.NOT_FOUND,reason=”测试方法上设置响应状态码“)

@RequestMapping(value=”/testResponseStatusExceptionResolver”)

public String testResponseStatusExceptionResolver(@RequestParam(“i”) int i){

if(i==13){

throw new UsernameNotMatchPasswordException();

}

System.out.println(“testResponseStatusExceptionResolver…”);

return “success”;

}

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ResponseStatus

package org.springframework.web.bind.annotation;

import java.lang.annotation.Documented;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

import org.springframework.http.HttpStatus;

/**

* Marks a method or exception class with the status code and reason that should be returned. The status code is applied

* to the HTTP response when the handler method is invoked, or whenever said exception is thrown.

* @author Arjen Poutsma

* @see org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver

* @since 3.0

@Target({ElementType.TYPE, ElementType.METHOD})

@Retention(RetentionPolicy.RUNTIME)

@Documented

public @interface ResponseStatus {

HttpStatus value();

String reason() default “”;

}

HttpStatus

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