javaWeb之初识Servlet

javaWeb之初识Servlet

javaWeb之初识Servlet_第1张图片
javaWeb之初识Servlet_第2张图片
javaWeb之初识Servlet_第3张图片

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+"/";
%>


<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting pagetitle>
    <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">
    
  head>

  <body>
      <h1>第一个Servlet小例子h1>
      <hr>
      <a href="servlet/HelloServlet">GET方式请求HelloServleta><br>
      <form action="servlet/HelloServlet" method="post">
          <input type="submit" value="POST方式请求HelloServlet">
      form>
  body>
html>

web.xml:


<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>moocServletdisplay-name>
  <welcome-file-list>
    <welcome-file>index.htmlwelcome-file>
    <welcome-file>index.htmwelcome-file>
    <welcome-file>index.jspwelcome-file>
    <welcome-file>default.htmlwelcome-file>
    <welcome-file>default.htmwelcome-file>
    <welcome-file>default.jspwelcome-file>
  welcome-file-list>

  <servlet>
      <servlet-name>HelloServletservlet-name>
      <servlet-class>com.mooc.servlet.HelloServletservlet-class>
  servlet>
  <servlet-mapping>
      <servlet-name>HelloServletservlet-name>
      <url-pattern>/servlet/HelloServleturl-pattern>
  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");//指定输出内容的文件格式和编码格式
        out.println("hello servlet
"
); } @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("hello servlet
"
); } }

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