Hello Servlet

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Create structure:

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.
├── pom.xml
├── src/
│   ├── main/
│   │   ├── com/
│   │   │   └── leon/
│   │   │       └── Hello.java
│   │   └── resources/
│   └── test/
│       ├── java/
│       └── resources/
└── web/
    ├── WEB-INF/
    │   └── web.xml
    └── hello.jsp

pom.xml web.xml

add dependency

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.leon</groupId>
  <artifactId>hello</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>hello Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>
  <build>
    <finalName>hello</finalName>
  </build>
</project>

add app config

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<?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">
</web-app>

Servlet

container action

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package com.leon;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(name = "hello", urlPatterns = {"/"})
public class Hello extends javax.servlet.http.HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().print("Hello World");
    }

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

}

IntelliJ IDEA

  1. Open Module Setting
  2. Set Project SDK/ Product/ Artifact direcotry
  3. Set Module resource folder, compile dependencies.
  4. Set Facets/ Artifact

test

http://localhost:8080/