javaWeb之初识Servlet

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javaWeb之初识Servlet

这里写图片描述

第一个Servlet代码：
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>      <hr>      <a href="servlet/HelloServlet">GET方式请求HelloServlet</a><br>      <form action="servlet/HelloServlet" method="post">          <input type="submit" value="POST方式请求HelloServlet">      </form>  </body></html>

web.xml:

<?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" id="WebApp_ID" version="3.0">  <display-name>moocServlet</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>HelloServlet</servlet-name>      <servlet-class>com.mooc.servlet.HelloServlet</servlet-class>  </servlet>  <servlet-mapping>      <servlet-name>HelloServlet</servlet-name>      <url-pattern>/servlet/HelloServlet</url-pattern><!-- 和a标签请求的路径一一对应 -->  </servlet-mapping></web-app>

HelloServlet.java:

package com.mooc.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HttpServletpublic 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");//指定输出内容的文件格式和编码格式        out.println("<strong>hello servlet</strong><br>");    }    @Override    protected void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        // TODO Auto-generated method stub        System.out.println("处理post请求....");        PrintWriter out=response.getWriter();        response.setContentType("text/html;charset=utf-8");//指定输出内容的文件格式和编码格式        out.println("<strong>hello servlet</strong><br>");    }}

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