欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

手工编写第一个Servlet 博客分类: java Servlet 

程序员文章站 2024-03-18 16:35:04
...
一 步骤
1、继承HttpServlet
2、重写doGet()或者doPost()方法
3、在web.xml中注册Servlet
 
二 HttpServlet类继承图

手工编写第一个Servlet
            
    
    博客分类: java Servlet 
 
 
三 实例
1、创建MyFirstServletDemo web project.

手工编写第一个Servlet
            
    
    博客分类: java Servlet 
 
2、编辑index.jsp
<%@ page language="java" import="java.util.*"  contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
   
    <title>My JSP 'index.jsp' starting page</title>
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">   
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">
        <!--
        <link rel="stylesheet" type="text/css" href="styles.css">
        -->
  </head>
 
  <body>
    <h1>第一个Servlet小例子</h1>
    <a href="servlet/HelloServlet">Get方式请求HelloServlet</a>
    <form action="servlet/HelloServlet" method="post">
                <input type="submit" value="Post方式请求HelloServlet">
    </form>
  </body>
</html>
3、编写HelloServlet
package servlet;
 
import java.io.IOException;
import java.io.PrintWriter;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
//继承于HttpServlet
public class HelloServlet extends HttpServlet {
 
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response)
                        throws ServletException, IOException {
                // TODO Auto-generated method stub
                System.out.println("处理get()请求...");
                PrintWriter out = response.getWriter();
                response.setContentType("text/html; charset=utf-8");
                out.println("<strong>Hello Servlet!</strong><br>");
        }
 
        @Override
        protected void doPost(HttpServletRequest request, HttpServletResponse response)
                        throws ServletException, IOException {
                System.out.println("处理post()请求...");
                PrintWriter out = response.getWriter();
                response.setContentType("text/html; charset=utf-8");
                out.println("<strong>Hello Servlet!</strong><br>");
        }
 
}
4、编写web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
        xmlns="http://java.sun.com/xml/ns/javaee";
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
  <display-name></display-name>  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
        <servlet-name>HelloServlet</servlet-name>
        <servlet-class>servlet.HelloServlet</servlet-class>
  </servlet>
  <servlet-mapping>
         <servlet-name>HelloServlet</servlet-name>
         <url-pattern>/servlet/HelloServlet</url-pattern>
  </servlet-mapping>
</web-app>
 
四 运行结果

 


手工编写第一个Servlet
            
    
    博客分类: java Servlet 
 
  • 手工编写第一个Servlet
            
    
    博客分类: java Servlet 
  • 大小: 191.7 KB
  • 手工编写第一个Servlet
            
    
    博客分类: java Servlet 
  • 大小: 39.4 KB
  • 手工编写第一个Servlet
            
    
    博客分类: java Servlet 
  • 大小: 20.7 KB
相关标签: Servlet