Javaservlet不加载jsp
我正试图像这样把一个jsp映射到一个servlet
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>HockeyNightWeb</display-name>
<servlet>
<servlet-name>DefaultServlet</servlet-name>
<servlet-class>DefaultServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DefaultServlet</servlet-name>
<url-pattern>/DefaultServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>DefaultServlet</servlet-name>
<url-pattern>/login.jsp</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>DefaultServlet</servlet-name>
<url-pattern>/DefaultServlet/login.jsp</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
</web-app>
因此，默认页面是login。当我没有将它映射到servlet时，页面就会显示出来。但是，当它被映射时，它会进入servlet，而不是登录。jsp不显示，url保持http://localhost:8080/HockeyNightWeb/
当我调试时，它进入doGet，然后什么也没发生
这是servlet
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* Servlet implementation class DefaultServlet
*/
public class DefaultServlet extends HttpServlet
{
private static final long serialVersionUID = 1L;
private MatchHandler matchHandler;
private RequestDispatcher jsp;
private ParisHandler parisHandler;
/**
* @see HttpServlet#HttpServlet()
*/
public DefaultServlet()
{
super();
matchHandler = new MatchHandler();
parisHandler = new ParisHandler();
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
System.out.println("doGet");
processRequest(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
System.out.println("doPost");
processRequest(request, response);
}
protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 1. get received JSON data from request
BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream()));
String json = null;
try
{
/*json = matchHandler.GetListeMatchJSON();
System.out.println(json);
String reponse = parisHandler.PostParis("Miaw", "Montreal", 5, "1");
System.out.println(reponse);*/
}
catch (ClassNotFoundException e)
{
e.printStackTrace();
}
//response.getWriter().write(arg0);
//response.sendRedirect("http://localhost:8080/HockeyNightWeb/index.jsp");
}
}
有人知道为什么吗？ 多谢各位
# 1 楼答案
必须将请求从servlet发送到所需的jsp页面。下面是对“如何从servlet向jsp发送请求”的回答
redirect jsp from servlet RequestDispatcher
阅读JEE HttpServletRequest页面，了解如何知道何时发送以及发送到何处的信息，提示：阅读getRequestURI
这是一个Good servlet and JSP tutorial site : Core Servlets and JSP。阅读“中间servlet&；JSP”和“高级servlet&；JSP”文章
# 2 楼答案
注意：您指的是具有相同servlet名称的不同URL
仅将此用作您的web。xml条目