DWR 过滤器验证权限

实现方法:在dwr每个方法调用前拦截验证权限

1.实现拦截器(需dwr2.0以上版本)

package net.gkyh.util;

import java.lang.reflect.Method;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

import org.directwebremoting.AjaxFilter;

import org.directwebremoting.AjaxFilterChain;

import org.directwebremoting.WebContext;

import org.directwebremoting.WebContextFactory;

public class DWRFilter implements AjaxFilter{

public Object doFilter(Object object, Method method, Object[] arr,

  AjaxFilterChain chain) throws Exception {

//获取session

 WebContext ctx = WebContextFactory.get(); 

        HttpServletRequest request = ctx.getHttpServletRequest(); 

        HttpSession session = request.getSession();

        String flag =(String) session.getAttribute("flag");        

        if(null == flag){

             System.out.println("session验证失败");

            return "session_error";

        }

//拦截调用方法

        String methodName=method.getName();

         System.out.println("拦截目标方法："+methodName);

       

       if(!CheckLimit(methodName)){

            System.out.println("权限验证失败");

           return "limit_error";

       }

Object obj=chain.doFilter(object, method, arr);

System.out.println("目标方法"+method.getName()+"执行结束");

return obj;

}

}

2.修改dwr.xml,添加红色部分

<?xml version="1.0" encoding="UTF-8"?>   

<!DOCTYPE dwr PUBLIC  "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN"  "http://www.getahead.ltd.uk/dwr/dwr10.dtd">

<dwr>   

    <allow>              

        <create javascript="TermManager" creator="spring" scope="application">   

            <param name="beanName" value="TermManager"></param>  

        </create> 

        <filter class="net.gkyh.util.DWRFilter"></filter>

    </allow>   

</dwr>

3.调用TermManager中的方法时会先执行DWRFilter拦截器