Intellij Idea创建的第一个JavaWeb程序-优快云博客

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("<html>");
        out.println("<head>");
        out.println("<title>Hello World!</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<h1>Hello World!</h1>");
        out.println("</body>");
        out.println("</html>");
    }

}

4.配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <servlet>
        <servlet-name>SayHello</servlet-name>
        <servlet-class>com.myweb.SayHello</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>SayHello</servlet-name>
        <url-pattern>/sayhello</url-pattern>
    </servlet-mapping>
</web-app>