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web app struts框架里实现filter.

1 web.xml里添加filter配置信息。
        

<filter>
                <filter-name>authentication</filter-name>
                <filter-class>
                        com.nova.colimas.web.filters.authenticationfilter 
                </filter-class>
                <init-param>
                        <param-name>onerror</param-name>
                        <param-value>/pages/index.jsp</param-value>
                </init-param>
        </filter>
        <filter-mapping>
                <filter-name>authentication</filter-name>
                <url-pattern>/protect/*</url-pattern>
        </filter-mapping>

<filter-class>定义使用com.nova.colimas.web.filters.authenticationfilter类执行过滤action。
<init-param>当验证失败后forward到/pages/index.jsp
<filter-mapping>只有当地址包括/protect/时运行filter类

2 实现com.nova.colimas.web.filters.authenticationfilter

package com.nova.colimas.web.filters;

import java.io.ioexception;
import javax.servlet.requestdispatcher;
import javax.servlet.servletexception;
import javax.servlet.http.*;
import javax.servlet.filter;
import javax.servlet.filterchain;
import javax.servlet.filterconfig;

import com.nova.colimas.web.bean.userbean;

import javax.servlet.servletrequest;
import javax.servlet.servletresponse;

import org.apache.struts.globals;
import org.apache.struts.action.*;
import com.nova.colimas.web.constants.constants;

/**
 * filter implementation for user authentication。必须实现filter接口
 * @author tyrone
 * @version $id: authenticationfilter.java,v 1.0
 */
public class authenticationfilter implements filter
{
        
        /**
         * filterconfig will store the reference of filterconfig
         */
        private filterconfig filterconfig;
        
        private string onerrorurl;

        /**
         * store the reference of the filterconfig.
         * @param config filterconfig object
         * @throws servletexception
         */
        public void init(filterconfig config) throws servletexception
        {
//获得验证失败forward地址
                filterconfig = config;
                onerrorurl=filterconfig.getinitparameter("onerror");
                if (onerrorurl==null  "".equals(onerrorurl)){
                        onerrorurl="/pages/index.jsp";
                }
        }
        /**
         * user authentication is  done. if user is authenticated successful then
         * control is transferred to logon uri
         * @param servletrequest request
         * @param servletrequest response
         * @param filterchain filter chain
         * @throws servletexception,ioexception
         */
        public void dofilter(servletrequest request, servletresponse response, filterchain next)
                        throws ioexception, servletexception
        {
                httpservletrequest httprequest = (httpservletrequest)request;
                httpservletresponse httpresponse=(httpservletresponse)response;
                // current session
                httpsession httpsession = httprequest.getsession();
//session里是否有用户信息。
                if (httpsession.getattribute(constants.user_key) == null)
                {
                        actionerrors errors=new actionerrors();
                        errors.add(actionerrors.global_error,
                                        new actionerror("error authentication"));
                        httprequest.setattribute(globals.error_key,errors);
                //没有，验证失败forward到/pages/index.jsp        httprequest.getrequestdispatcher(onerrorurl).forward(httprequest,httpresponse);
                }else
//成果过滤action结束
                        next.dofilter(request,response);
                
        }

        /**
         * destroy() method is called by the servlet container
         */
        public void destroy()
        {
        }
        
}

 

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