Java sessionCreate不起作用
[英]Java sessionCreate doesn't work
問題描述
我正在使用Java EE。 我的會話有一些問題。 我已經創建了Listener類，它看起來像這樣：
package RandomPackage;
import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
/**
* Application Lifecycle Listener implementation class Listener
*
*/
@WebListener
public class Listener implements HttpSessionListener {
/**
* Default constructor.
*/
public Listener() {
// TODO Auto-generated constructor stub
}
/**
* @see HttpSessionListener#sessionCreated(HttpSessionEvent)
*/
public void sessionCreated(HttpSessionEvent arg0) {
System.out.print("Session Created");
arg0.getSession().setAttribute("Name", "Geoge");
}
/**
* @see HttpSessionListener#sessionDestroyed(HttpSessionEvent)
*/
public void sessionDestroyed(HttpSessionEvent arg0) {
// TODO Auto-generated method stub
}
}
現在在我的HTML文件中，有以下代碼：
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1> Hello </h1>
<form action="SessionTest" method="POST">
<input type="submit">
</form>
</body>
</html>
我的SessionTest servlet如下所示：
package RandomPackage;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/SessionTest")
public class SessionTest extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public SessionTest() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("String is " + (String)request.getSession().getAttribute("Name"));
}
}
它應該具有輸出：“ String is George”，但是它永遠不會輸出“ Session Created”，而輸出是“ String is null”
有什么建議么？
1 個解決方案
解決方案1
0 2017-05-23 17:42:53
我已經嘗試過相同的代碼，對我來說工作看到輸出
Java繪畫不起作用
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