package com.crm.filter; import java.io.IOException; import java.io.PrintWriter; 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; public class LoginFilter implements Filter { private static final String LOGON_URI = "LOGON_URI"; private static final String HOME_URI = "HOME_URI"; private String logon_page; private String home_page; public void destroy() { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest) request; HttpServletResponse resp = (HttpServletResponse) response; resp.setContentType("text/html;"); resp.setCharacterEncoding("utf-8"); HttpSession session = req.getSession(); PrintWriter out = resp.getWriter(); // 得到用户请求的URI String request_uri = req.getRequestURI(); // 得到web应用程序的上下文路径 String ctxPath = req.getContextPath(); // 去除上下文路径,得到剩余部分的路径 String uri = request_uri.substring(ctxPath.length()); // 判断用户访问的是否是登录页面 if (uri.equals(logon_page) || uri.equals(home_page)) { chain.doFilter(request, response); return; } else { // 如果访问的不是登录页面,则判断用户是否已经登录 if (null != session.getAttribute("curUser") && "" != session.getAttribute("curUser")) { chain.doFilter(request, response); return; } else { out.println(""); return; } } } public void init(FilterConfig config) throws ServletException { // TODO Auto-generated method stub // 从部署描述符中获取登录页面和首页的URI logon_page = config.getInitParameter(LOGON_URI); home_page = config.getInitParameter(HOME_URI); // System.out.println(logon_page); if (null == logon_page || null == home_page) { throw new ServletException("没有找到登录页面或主页"); } } } web.xml loginFilter com.crm.filter.LoginFilter LOGON_URI /login.jsp HOME_URI /index.jsp loginFilter *.jsp |
作者:吴旭晓 | 来源:个人博客 | 点击量:1796 | 发布时间:2013-06-26
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