How IDEA perfectly configures Servlet (applicable to IDEA 2022 and below)

Table of contents

Prepare Java files

import-servlet-api.jar

Configure Tomcat server

Prepare Java files

1. First create a new Java project

Select the new project, select Maven as the build system, and click Create

2. Choose to add framework support (in English Add Framework Support)

3. Choose to add web applications (check Web Application) and JavaEE applications (Java Applications) and click OK

4. web/WEB-INFCreate a new lib folder in the directory

import-servlet-api.jar

Download tomcat, I downloaded tomcat9.0
Apache Tomcat® - Welcome!
Enter Project Structure, click on the library, click on the plus sign + select Java

3. Find the location of the downloaded tomcat file package, open lib, select jsp-api.jar and servlet-api.jar

4. Click OK to open the path under src

5. Right-click to select servlet and create a file

6. New servlet

package org.example; /**
 * @author 雫玖
 * @version 1.0
 * @date 2022/10/1 17:16
 */

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet(name = "Servlet", value = "/Servlet")
public class Servlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}

7. Add mapping in web.xml

<?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">

    <servlet>
        <servlet-name>Servlet</servlet-name>
        <servlet-class>org.example.Servlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Servlet</servlet-name>
        <url-pattern>/demo</url-pattern>
    </servlet-mapping>

</web-app>