Tomcat is a commonly used Java Web application server, and deploying WAR packages is a common practice for publishing and running Web applications in Tomcat. This article will introduce the detailed steps of deploying WAR packages under Tomcat and provide specific code examples.

1. Preparation
   Before you start deploying the WAR package, you need to ensure that you have installed Tomcat and the relevant environment configuration has been completed. In addition, you also need to prepare the WAR package file to be deployed. You can create a simple web application and generate the WAR package by following the following steps:

1.1 Create a file namedHelloWorldfolder and create the following directory structure under the folder:

|- HelloWorld |- WEB-INF |- classes |- lib |- web.xml |- index.html

1.2 Write a simple HTML page in theindex.htmlfile. The content can be arbitrary.
1.3 Create aweb.xmlfile in theWEB-INFdirectory, and configure Servlet mapping and other related information in it. The following is a simple example:

  HelloWorld  HelloServlet com.example.HelloServlet   HelloServlet /hello  

1.4 Write a Java class namedHelloServletto implement a simple Servlet class. The following is an example:

package com.example; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; @WebServlet("/hello") public class HelloServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException { PrintWriter out = response.getWriter(); out.println(""); out.println(""); out.println("
Hello, World!
"); out.println(""); out.println(""); } }

1.5 Compile the Java class file and compile the # The ##.classfile is copied to theWEB-INF/classesdirectory.1.6 Copy all dependent jar packages to the
WEB-INF/libdirectory.

HelloWorld.war.

Deploying WAR package
2. 2.1 Move the generated WAR package file to the
   webappsdirectory of Tomcat.2.2 Run the Tomcat server and wait for it to automatically decompress and deploy the WAR package.
   

http://localhost:8080/HelloWorld/in the browser to access the homepage of the application.

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