嗨我用servlet做了简单的Web应用程序,根据可用会话提供登录和欢迎页面。我已经连接了下面的代码,重定向到servlet中的根URL
每当用户键入URL http://localhost:8888/
,他必须要到dashboard
的servlet(如web.xml
提)
在dashboard servlet
,其中会话检查
如果会话是可用的,那么我将成为welcome.html
页面, 否则我重定向到login servlet
在login servlet
,
GET
方法, 如果用户有我重定向到dashboard servlet
否则会议上,我将转发welcome.html
页面
用户进入后的信息,将发布信息所述login servlet
(即,POST)
POST
方法, 我会得到来自请求的用户名和密码,我将检查值是admin
和password
如果这是真的创建一个会话,将用户重定向到dashboard servlet
否则我将用户重定向到login servlet
(GET方法)
Web应用程序应该需要有只有这2个网址,
(1)http://localhost:8888/
(2)http://localhost:8888/login
用户应该不知道我服他们网页的类型(HTML或JSP),但我要为只有HTML页面(这是我的要求)
当我启动应用程序引擎,起初请求发送到仪表板,然后它会被重定向到login servlet
但后来它的制作回路仪表盘再次
我用System.out.println()
跟踪控制我的输出是
The admin console is running at http://localhost:8888/_ah/admin
Jul 25, 2017 11:12:55 AM com.google.appengine.tools.development.DevAppServerImpl doStart
INFO: Dev App Server is now running
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
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login servlet get method
request no session
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get method
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request no session
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request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
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request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
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request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
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request no session
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get method
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request no session
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no session,
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request no session
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request no session
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request no session
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no session,
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request no session
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no session,
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request no session
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request no session
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request no session
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request no session
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request no session
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request no session
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request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
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request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
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request no session
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get method
no session,
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request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
-->dashboard servlet
get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
login servlet get method
request no session
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get method
no session,
问题:
如何才能解决这个问题呢?
如果我更改了web.xml
URL模式为<url-pattern>/index</url-pattern>
和徘徊无论重定向到/
我改/index
为dashboard servlet
它工作正常,但我怎么能使用的“/”的servlet的servlet的
我已附加下面的源代码,
仪表盘的servlet
包的servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@SuppressWarnings("serial")
public class DashboardServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("-->dashboard servlet");
System.out.println("get method");
HttpSession session = req.getSession(false);
if (session != null) {
System.out.println("session is available");
req.getRequestDispatcher("/WEB-INF/welcome.html").forward(req, resp);
} else {
System.out.println("no session,");
resp.sendRedirect("/login");
}
}
}
登录的Servlet
package servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@SuppressWarnings("serial")
public class LoginServlet extends HttpServlet {
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("-->>>login servlet post method");
String name = req.getParameter("username");
String password = req.getParameter("password");
if (name.equals("admin") && password.equals("password")) {
HttpSession session = req.getSession();
session.setAttribute("sessionUserName", name);
resp.sendRedirect("/");
} else {
resp.sendRedirect("/login");
}
}
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("login servlet get method");
HttpSession session = req.getSession(false);
if (session != null) {
System.out.println("request with session");
resp.sendRedirect("/");
} else {
System.out.println("request no session");
req.getRequestDispatcher("/WEB-INF/login.html").forward(req, resp);
}
}
}
的web.xml
<web-app>
<servlet>
<servlet-name>Login</servlet-name>
<servlet-class>servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>Dashboard</servlet-name>
<servlet-class>servlet.DashboardServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Dashboard</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
的AppEngine-web.xml中
<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
<application></application>
<version>1</version>
<threadsafe>true</threadsafe>
<system-properties>
<property name="java.util.logging.config.file" value="WEB-INF/logging.properties" />
</system-properties>
<sessions-enabled>true</sessions-enabled>
</appengine-web-app>
的login.html
<!DOCTYPE html>
<html>
<head>
<title>Insert title here</title>
</head>
<body>
<form action="/login" method="post">
User name :<input type='text' name='username'>Password :<input
type='password' name='password'><input type='submit'
value='Submit'>
</form>
</body>
</html>
welcome.html
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>welcome here
</body>
</html>
谢谢
是,即使我试图与会话属性中,如果条件('如果(会话! = null && session.getAttribute(“sessionUserName”)。equals(“admin”))')它给出了相同的结果@yılmaz – Prakash
@Prakash答案编辑。 –
@Prakash如果问题解决了,请将其标记为已解决。 –