手工编写第一个Servlet

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博客分类：

java

Servlet

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

三实例

1、创建MyFirstServletDemo web project.

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>

<title>My JSP 'index.jsp' starting page</title>

<!--

-->

</head>

<body>

<h1>第一个Servlet小例子</h1>

<a href="servlet/HelloServlet">Get方式请求HelloServlet</a>

</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

http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd";>

<display-name></display-name>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<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

查看图片附件

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2017-10-11 20:06
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