通过Session 登入/登出

地址: http://struts2.group.iteye.com/group/wiki/1654-18-through-session-login-logout

在本章我们将通过Session创建一个login/logout程序.该程序会对用户进行身份验证.每当你运行的时候它将获取用户id和密码(用户名/密码都是"admin").当两个字段都是正确的,显示欢迎页面.

在struts.xml中创建Action映射.这就是要添加到struts.xml中的代码 :

Xml代码

1. <action name="login" class="net.roseindia.loginAction" > 
2.         <result name="success" type="dispatcher">/pages/uiTags/Success.jsp</result> 
3.        <result name="error" type="redirect">/pages/uiTags/Login.jsp</result> 
4. </action> 
5.  
6. <action name="logout" class="net.roseindia.logoutAction" > 
7.        <result name="success" type="redirect">/pages/uiTags/checkLogin.jsp</result> 
8. </action> 

<action name="login" class="net.roseindia.loginAction" >        <result name="success" type="dispatcher">/pages/uiTags/Success.jsp</result>       <result name="error" type="redirect">/pages/uiTags/Login.jsp</result></action><action name="logout" class="net.roseindia.logoutAction" >       <result name="success" type="redirect">/pages/uiTags/checkLogin.jsp</result></action>

创建一个Action类来处理login请求.struts2框架提供了一个基础的ActionSupport类,它实现了常用的框架接口.在我们的Action类中(loginAction.java)我们继承了ActionSupport类.

这就是"loginAction"的代码 :

Java代码

1. package net.roseindia; 
2. import com.opensymphony.xwork2.ActionSupport; 
3. import com.opensymphony.xwork2.ActionContext; 
4. import java.util.*; 
5.  
6. public class loginAction extends ActionSupport { 
7.   private String userId; 
8.   private String password; 
9.   public String execute() throws Exception{ 
10.  
11.     if ("admin".equals(userId) && "admin".equals(password)) { 
12.       Map session = ActionContext.getContext().getSession(); 
13.       session.put("logged-in","true"); 
14.             return SUCCESS; 
15.         } 
16.     else{ 
17.        return ERROR; 
18.     } 
19.     } 
20.  
21.     public String logout() throws Exception { 
22.  
23.     Map session = ActionContext.getContext().getSession(); 
24.     session.remove("logged-in"); 
25.         return SUCCESS; 
26.     } 
27.  
28.     public String getPassword() { 
29.         return password; 
30.     } 
31.  
32.     public void setPassword(String password) { 
33.         this.password = password; 
34.     } 
35.  
36.     public String getUserId() { 
37.         return userId; 
38.     } 
39.  
40.     public void setUserId(String userId) { 
41.         this.userId = userId; 
42.     } 
43. }  

package net.roseindia;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.ActionContext;import java.util.*;public class loginAction extends ActionSupport {  private String userId;  private String password;  public String execute() throws Exception{    if ("admin".equals(userId) && "admin".equals(password)) {      Map session = ActionContext.getContext().getSession();      session.put("logged-in","true");            return SUCCESS;        }    else{       return ERROR;    }    }    public String logout() throws Exception {    Map session = ActionContext.getContext().getSession();    session.remove("logged-in");        return SUCCESS;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public String getUserId() {        return userId;    }    public void setUserId(String userId) {        this.userId = userId;    }} 

同样,创建一个Action类来处理登出操作.该类(logoutAction)继承了ActionSupport

这是logoutAction的代码

Java代码

1. package net.roseindia; 
2. import javax.servlet.http.HttpSession; 
3. import com.opensymphony.xwork2.ActionSupport; 
4. import com.opensymphony.xwork2.ActionContext; 
5. import java.util.*; 
6.  
7. public class logoutAction extends ActionSupport { 
8.   public String execute() throws Exception {  
9.     Map session = ActionContext.getContext().getSession(); 
10.     session.remove("logged-in");  
11.     return SUCCESS; 
12.     } 
13. }  

package net.roseindia;import javax.servlet.http.HttpSession;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.ActionContext;import java.util.*;public class logoutAction extends ActionSupport {  public String execute() throws Exception {     Map session = ActionContext.getContext().getSession();    session.remove("logged-in");     return SUCCESS;    }} 

创建Login表单:该程序的用户界面由login表单组成(Login.jsp). "Login.jsp"向用户显示了登录页面.

这是login.jsp文件的代码 :

Html代码

1. <%@ taglib prefix="s" uri="/struts-tags" %> 
2. <%@ page language="java" contentType="text/html"%> 
3.  
4. <html> 
5.     <head> 
6.         <title>Insert Data here!</title> 
7.      <link href="<s:url value="/css/main.css"/>" rel="stylesheet" 
8.           type="text/css"/>   
9.   </head> 
10.     <body> 
11.     <s:form action="/roseindia/login.action" method="POST"> 
12.       <s:textfield name="userId" label="Login Id"/><br> 
13.       <s:password name="password" label="Password"/><br> 
14.          <s:submit value="Login" align="center"/> 
15.     </s:form> 
16.   </body> 
17. </html> 

<%@ taglib prefix="s" uri="/struts-tags" %><%@ page language="java" contentType="text/html"%><html>    <head>        <title>Insert Data here!</title>     <link href="<s:url value="/css/main.css"/>" rel="stylesheet"          type="text/css"/>    </head>    <body>    <s:form action="/roseindia/login.action" method="POST">      <s:textfield name="userId" label="Login Id"/><br>      <s:password name="password" label="Password"/><br>         <s:submit value="Login" align="center"/>    </s:form>  </body></html>

当用户得到了成功的身份验证,"Success.jsp"页面显示的登录的成功信息(Welcome, you have logged-in.)和session(Session Time: Wed Aug 01 11:26:38 GMT+05:30 2007 and Logout ).如果你点击"Logout",将再次显示login页面.

这是Success.jsp文件的代码 :

Html代码

1. <%@ taglib prefix="s" uri="/struts-tags" %> 
2. <%@ page language="java" contentType="text/html" import="java.util.*"%> 
3. <jsp:include page="/struts2tags/pages/uiTags/loginCheck.jsp" /> 
4.  
5. <html> 
6.     <head> 
7.         <title>Welcome, you have logined!</title> 
8.   </head> 
9.     <body> 
10.     Welcome, you have logined. <br /> 
11.     <b>Session Time: </b><%=new Date(session.getLastAccessedTime())%> 
12.       <br /><br /> 
13.       <a href="<%= request.getContextPath() %>/roseindia/logout.action">Logout</a> 
14.       <br /> 
15.     </body> 
16. </html> 

<%@ taglib prefix="s" uri="/struts-tags" %><%@ page language="java" contentType="text/html" import="java.util.*"%><jsp:include page="/struts2tags/pages/uiTags/loginCheck.jsp" /><html>    <head>        <title>Welcome, you have logined!</title>  </head>    <body>    Welcome, you have logined. <br />    <b>Session Time: </b><%=new Date(session.getLastAccessedTime())%>      <br /><br />      <a href="<%= request.getContextPath() %>/roseindia/logout.action">Logout</a>      <br />    </body></html>

该页面登出合法用户.

checkLogin.jsp

Html代码

1. <%@ taglib prefix="s" uri="/struts-tags" %> 
2. <%@ page language="java" contentType="text/html" import="java.util.*"%> 
3. <html> 
4.     <head> 
5.         <title>Check validate!</title> 
6.   </head> 
7.     <body> 
8.       <s:if test="#session.login != 'admin'"> 
9.       <jsp:forward page="/pages/uiTags/Login.jsp" />   
10.       </s:if> 
11.     </body> 
12. </html> 

<%@ taglib prefix="s" uri="/struts-tags" %><%@ page language="java" contentType="text/html" import="java.util.*"%><html>    <head>        <title>Check validate!</title>  </head>    <body>      <s:if test="#session.login != 'admin'">      <jsp:forward page="/pages/uiTags/Login.jsp" />        </s:if>    </body></html>

输出 :

运行程序获得登录页面 :

在login页面输入错误的用户id和密码 :

你将得到下面的输出 :

输入正确的用户id和密码 :

你将获得如下输出 :

点击"Logout"后,你将获得如下输出 :