使用Session 登录，注销
我们打算开发一个使用到Session登录/注销的应用。这个应用验证用户的身份，无论你什么时候运行，它都需要用户的id和password（id和password都是admin）当两个字段都输入下确的时候，它显示welcome页面。
在struts.xml文件里创建一个action mapping 。代码如下
<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>
开发一个Action类管理login请求,Struts2框架提供一个基类ActionSupport,loginAction的代码如下：
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;
}
}
同样地，要开发一个Action类来管理logout 的操作,LogoutAction代码如下：
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;
}
}
登录页面login.jsp
<%@ 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>
登录成功的页面：success.jsp
<%@ 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>
注销成功的页面checkLogin.jsp
<%@ 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>
