entryservlet.java

简单的sso实现

package org.yqing.sso;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
 * @author <a href="mailto:[e-mail]">Cabby</a>
 *	sso server servlet
 */
public class EntryServlet extends HttpServlet {
	
	private static final Log log = LogFactory.getLog(EntryServlet.class);
	
	private String modulus="";
	
	private String priExponent ="";
	
	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		Permission permission =Permission.getInstance(request,response);
		if(permission.isLogin()){
			String mainPage = permission.getRedirectUrl(modulus, priExponent);
			log.info("登陆成功转到主页面:"+mainPage);
			response.sendRedirect(mainPage);
		}else{
			
			response.sendRedirect(Constant.HINT_PAGE+"?"+permission.getLoginUrl());
		}
		return;
		
	}

	
	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		
		this.modulus = getInitParameter("modulus");
		this.priExponent = getInitParameter("priExponent");
		
		Constant.LOGIN_PATH = getInitParameter("login_path");
		
		Constant.QUERY_STRING = getInitParameter("queryString");
		Constant.RESOURCE_NAME = getInitParameter("resourceName");
		Constant.ALGORITHM = getInitParameter("algorithm");
		Constant.PRE_URL=getInitParameter("welcomePage");
		Constant.WELCOME_PAGE = getInitParameter("welcomePage");
		Constant.HINT_PAGE = getInitParameter("hintPage");
	}

}