纪念错误的理解单点登录

西门呀在吹雪

发布于 2020-11-09 09:49:51

3260

发布于 2020-11-09 09:49:51

文章被收录于专栏：架构之巅

错误理解了单点登录的概念老长时间，原因为只允许单用户登录系统就叫单点登录，度娘说我理解错了，这才真正明白嘛叫单点登录。这个例子是按照以前错误的理解来想的“单点登录” 现在想想应该叫 only—one-user-can-sign

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'index.jsp' starting page</title> </head> <body> <FORM action="Login.action" type="post"> <input type="text" name="username"/> <input type="submit" value="登录"> </FORM> </body> </html>

error.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'error.jsp' starting page</title> <meta http-equiv="Refresh" content="2;url=/SINGLE_LOGIN/index.jsp"> </head> <body> 该用户<font color="red">${sessionScope.username }</font>已经登录,即将转入登陆页面请重新登录<%--<%request.getSession().invalidate();%>

--%><%-- <script type="text/javascript"> window.close() </script> --%> </body> </html>

package com.test.action;

import java.util.Date;

import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class Login extends ActionSupport{

@Override public String execute() throws Exception { HttpServletRequest request=ServletActionContext.getRequest(); String username=request.getParameter("username"); String time=new Date()+""; System.out.println("当前登录用户名"+username+"#########"+time); HttpSession session=request.getSession(); System.out.println(session.getId()+"====what"); // System.out.println(session.isNew()); System.out.println(session.getCreationTime()+"创建时间");//1340611925538创建时间 if(username.equals(session.getAttribute("username"))){ return ERROR; }else { session.setAttribute("username",username); return SUCCESS; } }

}

struts.xml

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="struts_default" extends="struts-default"> <action name="Login" class="com.test.action.Login"> <result name="success">/success.jsp</result> <result name="error">/error.jsp</result> </action> </package> </struts>

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原始发表：2012/08/07 ，如有侵权请联系 cloudcommunity@tencent.com 删除

struts