Springmvc异常处理器及拦截器实现代码

今天带来Springmvc异常处理器及拦截器实现代码教程详解

一、异常处理器

1、实现HandlerExceptionResolver接口

package com.wuxi.exceptions;

import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class RequestExceptionResolver implements HandlerExceptionResolver {
  @Override
  public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
    ModelAndView mv = new ModelAndView();
    mv.addObject("errorMsg", e.getMessage());//错误信息
    mv.setViewName("error");//请求转发的页面
    return mv;
  }
}

2、springmvc的xml配置文件

二、拦截器

1、实现HandlerInterceptor接口

package com.wuxi.interceptors;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ControllerInterceptor implements HandlerInterceptor {
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    System.out.println("controller的方法执行之前执行");
    return true;//true：放行；false：拦截
  }

  @Override
  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    System.out.println("controller的方法执行之后执行");
  }

  @Override
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    System.out.println("jsp执行之后执行");
  }
}

2、springmvc的xml配置文件

 

   
    
   
  
    
    
   
   
  
    
       
         
       
    
   
   
    
    
    
   
  
    
   
   
   
   
   
     pre2->controller->post2->post1->jsp->after2->after1-->
     
       
       
       
       -->
       
     
   
   
    
 

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