HelloWorld Example

By AmarSivas | Created :2019-04-13 | Updated : 2020-12-21 | Viewed : 418 times

The current article explains about Hello-World with Servlet. We will learn about the servlet set up and will learn about the Hello-World example.

Perquisitions

JdK 11
Servlet 4.0
Apache-Tomcat 9.0.16
Eclipse 4.X
Apache Maven 3.X

As we are using the Maven as build management tool, we will create a maven project in eclipse as given below.

Create Maven project for HelloWorldApp-Example

Click on File tab 
--> New 
--> Click on Maven Project 
--> Please check on Create Simple Project (Skip architype selection) 
--> Click on Next --> Enter the values com.docsconsole.tutorials.servlet4 as Group Id, HelloWorldApp-Example as Artifact Id 
--> Click on Finish

pom.xml

<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/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.docsconsole.tutorials.servlet4</groupId>
	<artifactId>HelloWorldApp-Example</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>
	<name>HelloWorldApp-Example</name>
	<description>HelloWorldApp-Example</description>


	<properties>
		<maven.war.plugin.version>3.2.2</maven.war.plugin.version>
		<servlets.version>4.0.0</servlets.version>
		<jsp.version>2.3.1</jsp.version>
		<jstl.version>1.2.2</jstl.version>
		<tld.version>1.1.2</tld.version>
		<log4j.version>1.2.17</log4j.version>
		<maven.compiler.source>11</maven.compiler.source>
		<maven.compiler.target>11</maven.compiler.target>
	</properties>

	<dependencies>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>${servlets.version}</version>
			<scope>provided</scope>
		</dependency>

		<!-- JSP Dependency -->
		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>javax.servlet.jsp-api</artifactId>
			<version>${jsp.version}</version>
			<scope>provided</scope>
		</dependency>

		<!-- JSTL Dependency -->
		<dependency>
			<groupId>javax.servlet.jsp.jstl</groupId>
			<artifactId>javax.servlet.jsp.jstl-api</artifactId>
			<version>${jstl.version}</version>
		</dependency>
		<!-- TagLibs Dependency -->
		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>${tld.version}</version>
		</dependency>
		<!-- Log4j -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>${log4j.version}</version>
		</dependency>
	</dependencies>

	<build>
		<pluginManagement>
			<plugins>

				<plugin>
					<groupId>org.apache.maven.plugins</groupId>
					<artifactId>maven-war-plugin</artifactId>
					<version>${maven.war.plugin.version}</version>
					<configuration>
						<warSourceDirectory>src/main/webapp</warSourceDirectory>
						<warName>${project.artifactId}</warName>
						<failOnMissingWebXml>false</failOnMissingWebXml>
					</configuration>
				</plugin>
			</plugins>
		</pluginManagement>
	</build>

</project>

Please create java and xml files as given below.

HelloWorldServlet.java

package com.docsconsole.servelet.tutorials;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloWorldServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public HelloWorldServlet() {
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		System.out.println("Hello World");
		
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("<html><body>");
		out.println("Hello World!");
		out.println("</body></html>");
		out.close();
	}

}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="4.0"
	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">
	
	<display-name>HelloWorldApp-Example</display-name>
	<servlet>
		<servlet-name>HelloWorldServlet</servlet-name>
		<servlet-class>com.docsconsole.servelet.tutorials.HelloWorldServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>
	
	<servlet-mapping>
		<servlet-name>HelloWorldServlet</servlet-name>
		<url-pattern>/helloWorld</url-pattern>
	</servlet-mapping>
</web-app>

After creation of the project the directory will be as given below

Please create war and deploy in tomcat server. Once it deployed please type URL “http://localhost:8080/HelloWorldApp-Example/helloWorld” in the browser then you can see below given output.

Please refer to the Github repository here Servlet-HelloWorld-Example-App