使用Java會話進行登錄/註銷

我的login.jsp頁面調用了此頁面LoginAction。

package struts.action; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import javax.servlet.http.HttpSession; 
import org.apache.struts.action.ActionForm; 
import org.apache.struts.action.ActionForward; 
import org.apache.struts.action.ActionMapping; 

import struts.form.LoginForm; 

public class LoginAction extends org.apache.struts.action.Action { 
private final static String SUCCESS = "success"; 
private final static String FAILURE = "failure"; 

    public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { 
     LoginForm lf = (LoginForm) form; 
     HttpSession session = request.getSession(true); 
     if (lf.getUsername().equals(lf.getPassword())) { 

      session.setAttribute("Username", lf.getUsername()); 
      System.out.println(session.getAttribute("Username")); 
      return mapping.findForward(SUCCESS); 

     } else { 
      return mapping.findForward(FAILURE); 
     } 
    } 
}

通訊LoginForm的頁面

package struts.form; 
import org.apache.struts.action.*; 

public class LoginForm extends ActionForm{ 

    private String username; 
    private String password; 

    public LoginForm() { 
     super(); 
    } 
    private static final long serialVersionUID = 104092268304152302L; 

    public String getUsername() { 
    return username; 
    } 

    public void setUsername(String username) { 
    this.username = username; 
} 

    public String getPassword() { 
     return password; 
     } 

     public void setPassword(String password) { 
     this.password = password; 
    } 
}

的success.jsp，在

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %> 
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %> 
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %> 
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %> 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><%@page 
    language="java" contentType="text/html; charset=ISO-8859-1" 
    pageEncoding="ISO-8859-1"%> 
<html> 
<head> 
<title>success</title> 
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 
</head> 
<body> 
<H1>Hello: <% session.getAttribute("Username"); %></H1> 

<html:form action="/LogoutAction" > 
     <html:submit value="Logout" /> 
</html:form> 

</body> 
</html>

註銷操作頁包struts.action登錄時所顯示的頁面;

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

import org.apache.struts.action.ActionForm; 
import org.apache.struts.action.ActionForward; 
import org.apache.struts.action.ActionMapping; 

public class LogoutAction extends org.apache.struts.action.Action { 

    private final static String SUCCESS = "success"; 
    private final static String FAILURE = "failure"; 

    @Override 
    public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) 
    throws Exception { 
     HttpSession session = request.getSession(true); 
     System.out.println(session.getAttribute("Username")); 

     try{ 
      session.removeAttribute("Username"); 
      session.invalidate(); 
      return mapping.findForward(SUCCESS); 
     }catch(Exception ex){ 
      System.out.println("Error"); 
     } 
    return mapping.findForward(FAILURE); 
    } 
}

對應的註銷表格 package struts.form; import org.apache.struts.action。*;

public class LogoutForm extends ActionForm{ 

    private static final long serialVersionUID = 1L; 

}

所以會在我的登錄操作創建，和它的作品，因爲如果我使用getAttribute（），並將其打印到控制檯，用戶名出現。但是，用戶名不會顯示在我的success.jsp頁面上。

任何人都可以幫忙嗎？

來源

2013-04-18 user2287752

您使用的是什麼版本的Struts2的？ – KyelJmD

失蹤=在<％= session.getAttribute（「用戶名」）; ％> – NullPointerException

優先考慮scriptlet，比如'$ {Username}'。 –

你忘了=

<H1>Hello: <%= session.getAttribute("Username"); %></H1>

來源

2013-04-18 15:29:09

這是有效的！非常感謝你！ – user2287752

@ user2287752高興地幫助:)與項目的好運。 –

使用Java會話進行登錄/註銷

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