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四個有用的過濾器 Filter

一、使瀏覽器不緩存頁面的過濾器

import javax.servlet.*;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

/**

* 用于的使 Browser 不緩存頁面的過濾器

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、檢測用戶是否登陸的過濾器

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;

/**

* 用于檢測用戶是否登陸的過濾器，如果未登錄，則重定向到指的登錄頁面

* 配置參數

* checkSessionKey 需檢查的在 Session 中保存的關鍵字

* redirectURL 如果用戶未登錄，則重定向到指定的頁面，URL不包括 ContextPath

* notCheckURLList 不做檢查的URL列表，以分號分開，并且 URL 中不包括 ContextPath

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());

}

三、字符編碼的過濾器

import javax.servlet.*;

import java.io.IOException;

/**

* 用于設置 HTTP 請求字符編碼的過濾器，通過過濾器參數encoding指明使用何種字符編碼,用于處理Html Form請求參數的中文問題

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、資源保護過濾器

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;

/**

* This Filter class handle the security of the application.

* It should be configured inside the web.xml.

* @author Derek Y. Shen

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;

/**

* Initializes the Filter.

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");

}

/**

* Standard doFilter object.

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");

chain.doFilter(req, res);

}

public void destroy() {}

private boolean contains(String value, String contextPath) {

Iterator ite = this.restrictedResources.iterator();

while (ite.hasNext()) {

String restrictedResource = (String)ite.next();

if ((contextPath + restrictedResource).equalsIgnoreCase(value)) {

return true;

}

return false;

}

private boolean authorize(HttpServletRequest req) {

//處理用戶登錄

/* UserBean user = (UserBean)req.getSession().getAttribute(BeanNames.USER_BEAN);

if (user != null && user.getLoggedIn()) {

//user logged in

return true;

}

else {

return false;

}*/

}

posted on 2007-12-03 17:13 都市淘沙者閱讀(611) 評論(0) 編輯收藏所屬分類: Java Basic/Lucene/開源資料

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四個有用的過濾器 Filter