index.jsp:
1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head> 10 <base href="<%=basePath%>"> 11 12 <title>My JSP 'index.jsp' starting page</title> 13 <meta http-equiv="pragma" content="no-cache"> 14 <meta http-equiv="cache-control" content="no-cache"> 15 <meta http-equiv="expires" content="0"> 16 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 17 <meta http-equiv="description" content="This is my page"> 18 </head> 19 20 <body> 21 <h1>第一个Servlet小例子</h1> 22 <hr> 23 <a href="servlet/HelloServlet">get方式请求HelloServlet</a><br> 24 <form action="servlet/HelloServlet" method="post"> 25 <input type="submit" value="用post方式请求HelloServlet" > 26 </form> 27 </body> 28 </html>
web.xml:
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app version="2.5" 3 xmlns="http://java.sun.com/xml/ns/javaee" 4 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 5 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 6 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> 7 <display-name></display-name> 8 <welcome-file-list> 9 <welcome-file>index.jsp</welcome-file> 10 </welcome-file-list> 11 12 <servlet> 13 <servlet-name>HelloServlet</servlet-name> 14 <servlet-class>servlet.HelloServlet</servlet-class> 15 </servlet> 16 <servlet-mapping> 17 <servlet-name>HelloServlet</servlet-name> 18 <!-- 和界面上的超链接一一对应 --> 19 <url-pattern>/servlet/HelloServlet</url-pattern> 20 </servlet-mapping> 21 </web-app>
HelloServlet.java
1 package servlet; 2 3 import java.io.IOException; 4 import java.io.PrintWriter; 5 6 import javax.servlet.ServletException; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse; 10 11 public class HelloServlet extends HttpServlet{ 12 13 @Override 14 protected void doGet(HttpServletRequest request, HttpServletResponse response) 15 throws ServletException, IOException { 16 System.out.println("处理get()请求......"); 17 PrintWriter out=response.getWriter(); 18 response.setContentType("text/html;charset=utf-8"); 19 out.println("<strong>Hello Servet!</strong><br>"); 20 } 21 22 @Override 23 protected void doPost(HttpServletRequest request, HttpServletResponse response) 24 throws ServletException, IOException { 25 System.out.println("处理post()请求......"); 26 PrintWriter out=response.getWriter(); 27 response.setContentType("text/html;charset=utf-8"); 28 out.println("<strong>Hello Servet!</strong><br>"); 29 } 30 31 }