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package DesktopSSO;            import java.io.*;            import java.net.*;            import java.text.*;            import java.util.*;            import java.util.concurrent.*;            import javax.servlet.*;            import javax.servlet.http.*;            public class SSOAuth extends HttpServlet {                                static private ConcurrentMap accounts;                static private ConcurrentMap SSOIDs;                String cookiename="WangYuDesktopSSOID";                String domainname;                                public void init(ServletConfig config) throws ServletException {                    super.init(config);                    domainname= config.getInitParameter("domainname");                    cookiename = config.getInitParameter("cookiename");                    SSOIDs = new ConcurrentHashMap();                    accounts=new ConcurrentHashMap();                    accounts.put("wangyu", "wangyu");                    accounts.put("paul", "paul");                    accounts.put("carol", "carol");                }                protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {                    PrintWriter out = response.getWriter();                    String action = request.getParameter("action");                    String result="failed";                    if (action==null) {                        handlerFromLogin(request,response);                    } else if (action.equals("authcookie")){                        String myCookie = request.getParameter("cookiename");                        if (myCookie != null)  result = authCookie(myCookie);                        out.print(result);                        out.close();                    } else if (action.equals("authuser")) {                        result=authNameAndPasswd(request,response);                        out.print(result);                        out.close();                    }  else if (action.equals("logout")) {                        String myCookie = request.getParameter("cookiename");                        logout(myCookie);                        out.close();                    }                }            .....            }

 private void handlerFromLogin(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {                    String username = request.getParameter("username");                    String password = request.getParameter("password");                    String pass = (String)accounts.get(username);                    if ((pass==null)||(!pass.equals(password)))                         getServletContext().getRequestDispatcher("/failed.html").forward(request, response);                    else {                        String gotoURL = request.getParameter("goto");                        String newID = createUID();                        SSOIDs.put(newID, username);                        Cookie wangyu = new Cookie(cookiename, newID);                        wangyu.setDomain(domainname);                        wangyu.setMaxAge(60000);                        wangyu.setValue(newID);                        wangyu.setPath("/");                        response.addCookie(wangyu);                        System.out.println("login success, goto back url:" + gotoURL);                        if (gotoURL != null) {                            PrintWriter out = response.getWriter();                            response.sendRedirect(gotoURL);                            out.close();                        }                    }                   }

package SSO;            import java.io.*;            import java.net.*;            import java.util.*;            import java.text.*;            import javax.servlet.*;            import javax.servlet.http.*;            import javax.servlet.*;            import org.apache.commons.httpclient.*;            import org.apache.commons.httpclient.methods.GetMethod;            public class SSOFilter implements Filter {                private FilterConfig filterConfig = null;                private String cookieName="WangYuDesktopSSOID";                private String SSOServiceURL=  "http://wangyu.prc.sun.com:8080/SSOAuth/SSOAuth";                private String SSOLoginPage= "http://wangyu.prc.sun.com:8080/SSOAuth/login.jsp";                                public void init(FilterConfig filterConfig) {                    this.filterConfig = filterConfig;                    if (filterConfig != null) {                        if (debug) {                            log("SSOFilter:Initializing filter");                        }                    }                            cookieName = filterConfig.getInitParameter("cookieName");                    SSOServiceURL = filterConfig.getInitParameter("SSOServiceURL");                    SSOLoginPage = filterConfig.getInitParameter("SSOLoginPage");                }              .....            .....            }

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {                    if (debug) log("SSOFilter:doFilter()");                    HttpServletRequest request = (HttpServletRequest) req;                    HttpServletResponse response = (HttpServletResponse) res;                    String result="failed";                    String url = request.getRequestURL().toString();                    String qstring = request.getQueryString();                    if (qstring == null) qstring ="";                    //檢查http請求的head是否有需要的cookie                    String cookieValue ="";                    javax.servlet.http.Cookie[] diskCookies = request.getCookies();                    if (diskCookies != null) {                        for (int i = 0; i < diskCookies.length; i++) {                            if(diskCookies[i].getName().equals(cookieName)){                                cookieValue = diskCookies[i].getValue();                                //如果找到了相應的cookie則效驗其有效性                                result = SSOService(cookieValue);                                if (debug) log("found cookies!");                            }                        }                    }                    if (result.equals("failed")) { //效驗失敗或沒(méi)有找到cookie，則需要登錄                        response.sendRedirect(SSOLoginPage+"?goto="+url);                    } else if (qstring.indexOf("logout") > 1) {//logout服務(wù)                        if (debug) log("logout action!");                        logoutService(cookieValue);                        response.sendRedirect(SSOLoginPage+"?goto="+url);                    }  else {//效驗成功                        request.setAttribute("SSOUser",result);                        Throwable problem = null;                        try {                            chain.doFilter(req, res);                        } catch(Throwable t) {                            problem = t;                            t.printStackTrace();                        }                               if (problem != null) {                            if (problem instanceof ServletException) throw (ServletException)problem;                            if (problem instanceof IOException) throw (IOException)problem;                            sendProcessingError(problem, res);                        }                    }                   }

    private String SSOService(String cookievalue) throws IOException {                    String authAction = "?action=authcookie&cookiename=";                    HttpClient httpclient = new HttpClient();                    GetMethod httpget = new GetMethod(SSOServiceURL+authAction+cookievalue);                    try {                          httpclient.executeMethod(httpget);                        String result = httpget.getResponseBodyAsString();                        return result;                    } finally {                        httpget.releaseConnection();                    }                }                                private void logoutService(String cookievalue) throws IOException {                    String authAction = "?action=logout&cookiename=";                    HttpClient httpclient = new HttpClient();                    GetMethod httpget = new GetMethod(SSOServiceURL+authAction+cookievalue);                    try {                        httpclient.executeMethod(httpget);                        httpget.getResponseBodyAsString();                    } finally {                        httpget.releaseConnection();                    }                }