idea中web项目的创建

在idea中创建web项目

1）创建一个普通的Java项目

2）右键项目选择ADD Framework Support

 3）勾选JavaEE

4）添加jar包

点击Project Structure

 5）部署Tomcat

配置项目访问路径

在Web工程中编写Servlet

在src下创建HelloServlet.java

package www.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 {
        PrintWriter pw=resp.getWriter();
        pw.println("HelloServlet");
        pw.flush();
        pw.close();
    }

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

在web.xml对该servlet进行配置

<?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_4_0.xsd"
         version="4.0">
    <!--为servlet取名-->
    <servlet>
        <servlet-name>servlet1</servlet-name>
        <servlet-class>www.servlet.HelloServlet</servlet-class>
    </servlet>
    <!--做URL映射-->
    <servlet-mapping>
        <servlet-name>servlet1</servlet-name>
        <url-pattern>/helloservlet</url-pattern>
    </servlet-mapping>
</web-app>

启动Tomcat