重定向到servlet中的根URL [英] Redirecting to the root URL in servlet
问题描述
您好,我使用servlet实现了简单的Web应用程序,以基于可用会话提供登录和欢迎页面。每当用户输入URL http:// localhost:8888 /
时,我附加了下面的代码,
他必须转到仪表板
servlet(如 web.xml
中所述)
在仪表盘servlet
中,检查会话
如果会话可用,那么我将服务 在 它会将信息发布到 如果它为true创建一个会话并将用户重定向到 web应用程序应该只有这2个URL, (1) 用户不应该知道我为他们服务的页面的类型(html或jsp),但我只需要提供HTML页面(这是我的要求) 当我启动应用程序引擎时,At首先将请求发送至仪表板,然后将其重定向至 我使用 问题: 如何解决这个问题? 如果我将 我附上了下面的源代码, dashboard servlet package servlet; 登录Servlet web.xml appengine-web.xml login.html welcome.html 谢谢, 您不应仅检查会话是否为空。你应该把像'logged_in'这样的值作为属性放入会话中。然后,控制它决定在哪里路由。 更新: 作为一种快速解决方案, LoginServlet doPost和更改doPost,如下所示: Hi I did simple web application with servlet, to serve login and welcome page based on the session available. I had attached the code below, whenever the user types the URL In the if the session is available, then I will serve In the after user entry the information, it will post the information to the if it is true create a session and redirect the user to the web application should need to have only these 2 URL, (1) user should not aware of the type of page I am serving to them(html or jsp) but I need to serve HTML page only(this my requirement) when I start the app engine, At first the request send to dashboard then it is redirected to the I used
QUESTION: How can solve this problem? If I change url pattern in I have attached the source code below, dashboard servlet package servlet; Login Servlet web.xml appengine-web.xml login.html welcome.html Thank you, You should not check only whether session is null. You should put a value like 'logged_in' into session as attribute. Then, control it for deciding where to route. Update: As a quick solution, route doGet inside LoginServlet to doPost and change doPost as below:
这篇关于重定向到servlet中的根URL的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋! welcome.html
页面,
,否则我将重定向到登录servlet $ c $
$ b 登录servlet
中,
GET
方法,
如果用户有会话我重定向到仪表盘servlet
else我会在用户输入信息后转发 welcome.html
页面
登录servlet
(即POST)。
POST
方法,
我会从请求中获取用户名和密码,我会检查值是 admin
和 password
dashboard servlet code>
else我将把用户重定向到登录servlet
(GET方法)
http:// localhost:8888 /
(2) http:// localhost:8888 / login
登录servlet
,然后再次为仪表板创建循环,
System.out.println()
跟踪控件输出结果是
管理控制台正在运行在http:// localhost:8888 / _ah / admin
Jul 25,2017 11:12:55 AM com.google.appengine.tools.development.DevAppSer verImpl doStart
INFO:Dev App Server现在正在运行
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >短划线board servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
没有会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet让我thod
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法d
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无session,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求no session
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
logi n servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无session,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求no session
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板服务器t
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
no会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- > ;仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
没有会话,
登录servlet get方法
请求没有会话
- >仪表板servlet
get方法
没有会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- - >仪表板servlet
get方法
无会话,
登录servlet get方法
re quest no session
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
no会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- > ;仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
没有会话,
登录servlet get方法
请求没有会话
- >仪表板servlet
get方法
没有会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无ssion,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- > ;仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
没有会话,
登录servlet get方法
请求没有会话
- >仪表板servlet
get方法
没有会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- - >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
没有会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet ge t方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无session,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get m ethod
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无session,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求no session
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get方法
无会话,
登录servlet get方法
请求no ses sion
- >仪表板servlet
get方法
无会话,
登录servlet get方法
请求无会话
- >仪表盘servlet
get method
no session,
web.xml
中的url模式更改为< url-pattern> / index< / url-pattern>
,并且在重定向到 /
的servlet中,我更改为 / index
对于
dashboard servlet
它工作正常,但我怎样才能使用servlet的/?
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 {$ b $ public void doGet(HttpServletRequest req,HttpServletResponse resp)抛出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);
$ b
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 {$ b $ public void doPost(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException {
// TODO自动生成方法存根
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);
$ b $ 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);
}
}
}
< web-app>
< servlet>
< servlet-name>登录< / servlet-name>
< servlet-class> servlet.LoginServlet< / servlet-class>
< / servlet>
< servlet-mapping>
< servlet-name>登录< / servlet-name>
< url-pattern> / login< / url-pattern>
< / servlet-mapping>
< servlet>
< servlet-name>仪表板< / servlet-name>
< servlet-class> servlet.DashboardServlet< / servlet-class>
< / servlet>
< servlet-mapping>
< servlet-name>仪表板< / servlet-name>
< url-pattern> /< / url-pattern>
< / servlet-mapping>
< / web-app>
<?xml version =1.0encoding =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.filevalue =WEB-INF / logging.properties/>
< / system-properties>
<会话启用>真实< /会话启用>
< / appengine-web-app>
<!DOCTYPE html>
< html>
< head>
< title>在此插入标题< / title>
< / head>
< body>
< form action =/ loginmethod =post>
用户名:< input type ='text'name ='username'>密码:< input
type ='password'name ='password'>< input type ='submit '
value ='提交'>
< / form>
< / body>
< / html>
<!DOCTYPE html>
< html>
< head>
< meta charset =ISO-8859-1>
< title>在此插入标题< / title>
< / head>
< body>欢迎在这里
< / body>
< / html>
public void doPost(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException {
System.out.println(login servlet get method);
HttpSession session = req.getSession(false);
if(session!= null&& session.getAttribute(sessionUserName)!= null){
System.out.println(request with session);
resp.sendRedirect(/);
} else {
String name = req.getParameter(username);
String password = req.getParameter(password);
if(name.equals(admin)&& password.equals(password)){
session = req.getSession();
session.setAttribute(sessionUserName,name);
resp.sendRedirect(/);
} else {
System.out.println(request no session);
req.getRequestDispatcher(/ WEB-INF / login.html)。forward(req,resp);
}
}
}
http://localhost:8888/
, he must take to the dashboard
servlet (as mention in the web.xml
)dashboard servlet
, where session is checked welcome.html
page,
else I redirect to login servlet
login servlet
,GET
method,
if the user have the session I redirect to the dashboard servlet
else I will the forward the welcome.html
pagelogin servlet
(i.e., POST)POST
method,
I will get the username and password from the request, I will check value is admin
and password
dashboard servlet
else I will redirect the user to the login servlet
(GET Method)http://localhost:8888/
(2) http://localhost:8888/login
login servlet
but then its making loop for the dashboard once again,System.out.println()
to track the control my output is 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
-->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
-->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,
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web.xml
as <url-pattern>/index</url-pattern>
and in the servlet whereever redirection to the /
I changed to /index
for the dashboard servlet
it is working fine, but how can I make use of the "/" for servletimport 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");
}
}
}
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);
}
}
}
<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>
<?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>
<!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>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>welcome here
</body>
</html>
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("login servlet get method");
HttpSession session = req.getSession(false);
if (session != null && session.getAttribute("sessionUserName")!=null) {
System.out.println("request with session");
resp.sendRedirect("/");
} else {
String name = req.getParameter("username");
String password = req.getParameter("password");
if (name.equals("admin") && password.equals("password")) {
session = req.getSession();
session.setAttribute("sessionUserName", name);
resp.sendRedirect("/");
} else {
System.out.println("request no session");
req.getRequestDispatcher("/WEB-INF/login.html").forward(req, resp);
}
}
}