HandlerExceptionResolver使用

落日映苍穹つ 2023-07-03 15:26 8阅读 0赞

1：介绍：

2：使用：

2.1 项目结构：

2.2：编写异常处理类：

2.3 编写控制器：

2.4：编写异常页面

2.5：测试：

--------------------

# 1：介绍： #

我们使用SimpleMappingExceptionResolver获取不到异常对象，**为了能够简化代码，而且能够获取到异常对象，我们使用HandlerExceptionResolver来处理异常，并进行页面的跳转。**

# **2：使用：** #

## 2.1 项目结构： ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70][]

## 2.2：编写异常处理类： ##

package com.bjsxt.springbooterr.exception;
    
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.HandlerExceptionResolver;
    import org.springframework.web.servlet.ModelAndView;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    @Configuration
    public class GloableHandler3 implements HandlerExceptionResolver {
    
        /**
         *
         * @param httpServletRequest
         * @param httpServletResponse
         * @param o 出现异常的对象
         * @param e 异常对象
         * @return
         */
        @Override
        public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
            ModelAndView mv=new ModelAndView();
            if (e instanceof NullPointerException){
                mv.setViewName("error5");
            }
            if(e instanceof  ArithmeticException){
                mv.setViewName("error6");
            }
            mv.addObject("error",e.toString());
            return mv;
        }
    }

## 2.3 编写控制器： ##

package com.bjsxt.springbooterr.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.servlet.ModelAndView;
    
    @Controller
    public class UserController {
    
        //空指针异常
        @RequestMapping("/pagejump")
        public String pageJump(){
            String str=null;
            str.length();
            return "ok";
        }
    
        //算术异常
        @RequestMapping("/pagejump1")
        public String pageJump1(){
            int i=3/0;
            return "ok";
        }
    
    
    }

## 2.4：编写异常页面 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 1][]

## ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 2][] ##

## 2.5：测试： ##

![20200207131100174.png][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/2020020713084712.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200207131009117.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20200207131028782.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTgxMTU0,size_16,color_FFFFFF,t_70
[20200207131100174.png]: https://img-blog.csdnimg.cn/20200207131100174.png