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Detailed guide to deploying WAR packages in Tomcat

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Jan 13, 2024 pm 02:05 PM

tomcat deploy war package

Detailed guide to deploying WAR packages in Tomcat

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.

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 named HelloWorld folder and create the following directory structure under the folder:

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

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1.2 Write a simple HTML page in the index.html file. The content can be arbitrary.
1.3 Create a web.xml file in the WEB-INF directory, and configure Servlet mapping and other related information in it. The following is a simple example:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" 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">
  <display-name>HelloWorld</display-name>
  <servlet>
    <servlet-name>HelloServlet</servlet-name>
    <servlet-class>com.example.HelloServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>HelloServlet</servlet-name>
    <url-pattern>/hello</url-pattern>
  </servlet-mapping>
</web-app>

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1.4 Write a Java class named HelloServlet to 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("<html>");
        out.println("<body>");
        out.println("<h1 id="Hello-World">Hello, World!</h1>");
        out.println("</body>");
        out.println("</html>");
    }
}

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1.5 Compile the Java class file and compile the # The ##.class file is copied to the WEB-INF/classes directory. 1.6 Copy all dependent jar packages to the
WEB-INF/lib directory.

Now, you have prepared a simple web application and generated a WAR package file named

HelloWorld.war.

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

After successfully deploying the WAR package, you can access the application in the browser. Assuming that your Tomcat server is running locally and the port number is 8080, you can enter

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

The above are the detailed steps for deploying WAR packages under Tomcat. By following these steps, you can get your web application deployed to a Tomcat server and up and running. Hope this article can be helpful to you!

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