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web.xml中 filter解析

AdminFilter.java：

package org.bluechant.mvc.filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.bluechant.mvc.core.GlobalSources;

/**

* @author CHAOS

* @date 2012-02-28 12:49

* filter for check wheather user already login in ,

* if not , send redirect to the login page

* if already login , forward user's request to the target request URL

public class AdminFilter implements Filter {

private String loginPage ;

private String loginAction ;

private String userLoginTag ;

//FilterConfig可用于訪問Filter的配置信息

private FilterConfig config;

//執(zhí)行過濾的核心方法

public void doFilter(ServletRequest req, ServletResponse res,

FilterChain chain) throws IOException, ServletException {

HttpServletRequest request = (HttpServletRequest) req;

HttpServletResponse response = (HttpServletResponse )res;

HttpSession session = request.getSession(true);

//獲取客戶請求的頁面

String urlPath = request.getServletPath();

//如果session范圍的user為null，即表明沒有登錄

//且用戶請求的既不是登錄頁面，也不是處理登錄的頁面if( session.getAttribute("user") == null

boolean flag = needNotFilter(urlPath);

//不需要進行攔截的頁面

if(!flag){

Object obj = session.getAttribute(userLoginTag);

System.out.println("the session userLoginTag value is :"+obj);

if(obj!=null){

flag = true ;

}

if(flag){

chain.doFilter(req, res);

}else{

//攔截不通過的時候跳轉(zhuǎn)到的目標//forward到登錄頁面

response.sendRedirect(request.getContextPath()+loginPage);

}

//只有在”/login.html“ || “/account!login.do” 情況下才進行攔截通過，否則攔截不通過跳到登陸頁面

private boolean needNotFilter(String urlPath){

if(urlPath.endsWith(loginPage) || urlPath.endsWith(loginAction)){

return true ;

}

return false ;

}

/**

* init params

public void init(FilterConfig config) throws ServletException {

loginPage = config.getInitParameter("loginPage");

loginAction = config.getInitParameter("loginAction");

userLoginTag = config.getInitParameter("userLoginTag");

System.out.println("the loginPage value is :"+loginPage);

System.out.println("the loginAction value is :"+loginAction);

System.out.println("the userLoginTag value is :"+userLoginTag);

this.config = config;

//以前頁面登陸的時候session進行設(shè)置HttpSession session = request.getSession(true);

//session.setAttribute(GlobalSources.user_login_tag, user);

GlobalSources.user_login_tag = userLoginTag ;//session放到GlobalSources，bean里，
用GlobalSources.user_login_tag獲得

}

public void destroy(){

this.config = null;

}

web.xml中對應filter文件:
<filter>
      <filter-name>adminFilter</filter-name>
      <filter-class>org.bluechant.mvc.filter.AdminFilter</filter-class>
          <init-param>
               <param-name>loginAction</param-name>
               <param-value>/account!login.do</param-value>
          </init-param>
          <init-param>
               <param-name>loginPage</param-name>
               <param-value>/login.html</param-value>
          </init-param>
          <init-param>
               <param-name>userLoginTag</param-name>
               <param-value>account_login_check</param-value>
          </init-param>
</filter>

<filter>
          <filter-name>userSourceFilter</filter-name>
          <filter-class>org.bluechant.mvc.filter.AccountRoleFilter</filter-class>
</filter>

<filter-mapping>
          <filter-name>adminFilter</filter-name>
          <url-pattern>*.do</url-pattern>
</filter-mapping>

<filter-mapping>
          <filter-name>userSourceFilter</filter-name>
          <url-pattern>*.do</url-pattern>
</filter-mapping>

posted on 2012-05-24 10:40 youngturk 閱讀(897) 評論(0) 編輯收藏所屬分類: web.xml解析

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