【发布时间】：2017-02-11 09:19:17
【问题描述】：
我正在尝试为 servlet 编写一个简单的代码来接受用户的输入并打印它。 这是我的 Servlet 类-：
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class welcome
*/
//@WebServlet("/welcome")
public class welcome extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public welcome() {
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());
response.setContentType("text/html");
PrintWriter pw=response.getWriter();
String name=request.getParameter("name");//will return value
pw.println("Welcome "+name);
pw.close();
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
我的Html页面代码-:Newfile101.html
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="./welcome" method="get">
Enter your name<input type="text" name="name"><br>
<input type="submit" value="login">
</form>
</body>
</html>
我的 web.xml 文件-：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>T3</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>son</servlet-name>
<servlet-class>welcome</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>son</servlet-name>
<url-pattern>/welcome</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>NewFile101.html</welcome-file>
</welcome-file-list>
</web-app>
现在即使我的 web.xml 包含欢迎文件列表，它仍然无法正常工作。 我在 eclipse oxigen 中使用 Tomcat 8.5。
请帮忙。
【问题讨论】：
-
为什么在同一个 web.xml 文件中有两个
<welcome-file-list>元素？是故意的吗？