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(iMilo)

 
 
 

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All the splendor in the world is not worth a good friend!! Hello my friend!!

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四个有用的Java过滤器(转)(  

2009-04-03 11:52:26|  分类: servlet |  标签: |举报 |字号 订阅

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一、使浏览器不缓存页面的过滤器    

import javax.servlet.*;   

import javax.servlet.http.HttpServletResponse;   

import java.io.IOException;    

  

  

public class ForceNoCacheFilter implements Filter {   

  

public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException   

  

    ((HttpServletResponse) response).setHeader("Cache-Control","no-cache");   

    ((HttpServletResponse) response).setHeader("Pragma","no-cache");   

    ((HttpServletResponse) response).setDateHeader ("Expires", -1);   

    filterChain.doFilter(request, response);   

  

  

public void destroy()   

  

  

  

      public void init(FilterConfig filterConfig) throws ServletException   

  

  

  

  

二、检测用户是否登陆的过滤器   

  

import javax.servlet.*;   

import javax.servlet.http.HttpServletRequest;   

import javax.servlet.http.HttpServletResponse;   

import javax.servlet.http.HttpSession;   

import java.util.List;   

import java.util.ArrayList;   

import java.util.StringTokenizer;   

import java.io.IOException;   

  

  

public class CheckLoginFilter   

implements Filter   

  

      protected FilterConfig filterConfig = null;   

      private String redirectURL = null;   

      private List notCheckURLList = new ArrayList();   

      private String sessionKey = null;    

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException   

  

    HttpServletRequest request = (HttpServletRequest) servletRequest;   

    HttpServletResponse response = (HttpServletResponse) servletResponse;   

  

     HttpSession session = request.getSession();   

    if(sessionKey == null)   

      

     filterChain.doFilter(request, response);   

     return;   

      

    if((!checkRequestURIIntNotFilterList(request)) && session.getAttribute(sessionKey) == null)   

      

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

     return;   

      

    filterChain.doFilter(servletRequest, servletResponse);   

  

  

public void destroy()   

  

    notCheckURLList.clear();   

  

  

private boolean checkRequestURIIntNotFilterList(HttpServletRequest request)   

  

    String uri = request.getServletPath() + (request.getPathInfo() == null ? "" : request.getPathInfo());   

    return notCheckURLList.contains(uri);   

  

  

public void init(FilterConfig filterConfig) throws ServletException   

  

    this.filterConfig = filterConfig;   

    redirectURL = filterConfig.getInitParameter("redirectURL");   

    sessionKey = filterConfig.getInitParameter("checkSessionKey");   

  

    String notCheckURLListStr = filterConfig.getInitParameter("notCheckURLList");   

  

    if(notCheckURLListStr != null)   

      

     StringTokenizer st = new StringTokenizer(notCheckURLListStr, ";");   

     notCheckURLList.clear();   

     while(st.hasMoreTokens())   

       

   notCheckURLList.add(st.nextToken());   

       

      

java源动力,java开源社区,http://www.web-java.com

  

  

  

三、字符编码的过滤器   

  

import javax.servlet.*;   

import java.io.IOException;   

  

  

public class CharacterEncodingFilter   

implements Filter   

  

protected FilterConfig filterConfig = null;   

protected String encoding = "";   

  

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException   

  

          if(encoding != null)   

           servletRequest.setCharacterEncoding(encoding);   

          filterChain.doFilter(servletRequest, servletResponse);   

  

  

public void destroy()   

  

    filterConfig = null;   

    encoding = null;   

  

  

      public void init(FilterConfig filterConfig) throws ServletException   

  

           this.filterConfig = filterConfig;   

          this.encoding = filterConfig.getInitParameter("encoding");   

  

  

  

  

四、资源保护过滤器   

  

  

package catalog.view.util;   

  

import javax.servlet.Filter;   

import javax.servlet.FilterConfig;   

import javax.servlet.ServletRequest;   

import javax.servlet.ServletResponse;   

import javax.servlet.FilterChain;   

import javax.servlet.ServletException;   

import javax.servlet.http.HttpServletRequest;   

import java.io.IOException;   

import java.util.Iterator;   

import java.util.Set;   

import java.util.HashSet;

//   

import org.apache.commons.logging.Log;   

import org.apache.commons.logging.LogFactory;    

  

  

public class SecurityFilter implements Filter {   

//the login page uri   

private static final String LOGIN_PAGE_URI = "login.jsf";   

    

//the logger object   

private Log logger = LogFactory.getLog(this.getClass());   

    

//a set of restricted resources   

private Set restrictedResources;   

    

  

public void init(FilterConfig filterConfig) throws ServletException {   

   this.restrictedResources = new HashSet();   

   this.restrictedResources.add("/createProduct.jsf");   

   this.restrictedResources.add("/editProduct.jsf");   

   this.restrictedResources.add("/productList.jsf");   

  

    

  

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)   

    throws IOException, ServletException {   

   this.logger.debug("doFilter");   

     

   String contextPath = ((HttpServletRequest)req).getContextPath();   

   String requestUri = ((HttpServletRequest)req).getRequestURI();   

     

   this.logger.debug("contextPath = " + contextPath);   

   this.logger.debug("requestUri = " + requestUri);   

     

   if (this.contains(requestUri, contextPath) && !this.authorize((HttpServletRequest)req)) {   

    this.logger.debug("authorization failed");   

    ((HttpServletRequest)req).getRequestDispatcher(LOGIN_PAGE_URI).forward(req, res);   

     

   else {   

    this.logger.debug("authorization succeeded");  

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