IDEA + Maven + Servlet：实现Servlet

IDEA + Maven + Servlet : 实现Servlet

1、打开idea软件，新建一个maven项目

2、往maven的pom.xml配置文件中添加依赖的jar包

3、main文件夹下添加2个文件夹

java标注为

resource标注为

4、更新web.xml配置文件

本来想用最新的web4.0的，无奈我的idea 2017.3不支持web4.0，把图中2个地方标注的4.0改为3.1就解决报错问题。

5、编写实现Servlet接口的类

package com.happy.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //往控制台输出
        System.out.println("Hello!");
        //往页面输出
        PrintWriter writer = resp.getWriter();  //响应流
        writer.println("Hello My Servlet!");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}