第一个JavaWeb程序

1. 创建

2. 目录结构

src目录用于放java源文件，web目录用于放web资源，WEB-INF是Java web应用固定的存放配置及类库的目录，index.jsp是我们首页，JavaWeb.iml是IntelliJ的项目文件，打开工程就是打开它 了，External Library是一些外部引用的库，展开看看好多。

3. 创建Servlet

修改代码

package com.myweb;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.*;/** * Created by Jiqing on 2017/1/9. */@WebServlet(name = "SayHello")public class SayHello extends HttpServlet {    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        response.setContentType("text/html");        PrintWriter out = response.getWriter();        out.println("");        out.println("");        out.println("");        out.println("");        out.println("");        out.println("
Hello World!
");        out.println("");        out.println("");    }}

4.配置

    
        
             
      
       SayHello
              
      
       com.myweb.SayHello
          
         
             
      
       SayHello
              
      
       /sayhello
          
     
    

5. 执行