java 单点登录源代码

package com.sso.servlet; import java.io.IOException; import java.io.PrintWriter; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentMap; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * Servlet implementation class MainServlet */ public class MainServlet extends HttpServlet { private static final long serialVersionUID = 1L; private static final String _COOKIENAME = "SSO" ; private ConcurrentMap SSOMap; public MainServlet() { super(); // TODO Auto-generated constructor stub } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { execute(request,response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { execute(request,response); } private void execute(HttpServletRequest request, HttpServletResponse response) { // TODO Auto-generated method stub HttpSession session = request.getSession(); String rs = ""; try { String method = request.getParameter("method"); String tourl = request.getParameter("tourl"); if("login".equals(method)){ session.setAttribute("tourl", tourl); response.sendRedirect("login.jsp"); }else if("getFlag".equals(method)){ String cookiename = request.getParameter("cookiename"); System.out.println("---------cookiename:"+cookiename); System.out.println("---------SSOMap.size():"+SSOMap.size()); if(cookiename!=null&&SSOMap!=null&&SSOMap.size()>0){ String value = SSOMap.get(cookiename).toString(); if(value != null){ rs = value; }else{ rs = "nologin"; } }else{ rs = "nologin"; } }else if("logincheck".equals(method)){ String username = request.getParameter("username"); String password = request.getParameter("password"); tourl = session.getAttribute("tourl").toString(); if("t".equals(username)&&"123".equals(password)){ // Cookie cookie = new Cookie("cookiename","cookievalue"); SSOMap.put(_COOKIENAME, "t"); System.out.println("--------tourl:"+tourl); response.sendRedirect(tourl); } } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } try { PrintWriter pw = response.getWriter(); pw.write(rs); pw.flush(); pw.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Override public void init() throws ServletException { // TODO Auto-generated method stub SSOMap = new ConcurrentHashMap<String,Object>(); } }