WAR, JAR, EAR, and TAR - Archive file formats

In -depth understanding of Java archive file format: war, jar, ear, and tar

War, JAR, EAR and TAR are different archive file formats. WAR is used to pack the Java Web application, including Servlet, JSP and Web resources, which are deployed on servers such as Tomcat. JAR package Java class and library for independent applications or dependencies. EAR is used for enterprise -level Java EE applications, combining WAR, JAR, and EJB modules and deployed on servers such as JBoss or Glassfish. TAR is a general archive format, which is used to store any type of file, which is usually used with compression (such as .tar.gz). Each format is for specific cases: WAR is used for web applications, JAR is used for library, EAR is used for enterprise applications, TAR is used for general file archives.

The following is a detailed comparison of war, jar, ear, and tar files:

War (Web Application Archive)

Usage: Used to pack and deploy web applications in Java.

Content:

Servlet, JSP files, HTML, CSS, JavaScript.

• Library (.jar file).
• Configure files, such as web.xml.
• Static resources (images, styles, etc.).
usage: deployed on the web server or application server, such as Tomcat or JBOSS.

Structure:

Key: Web applications specific packaging.

<code>MyApp.war
├── WEB-INF/
│ ├── web.xml
│ ├── lib/
│ └── classes/
├── index.html
├── styles.css
└── script.js</code>

jar (java archive)

2. Usage: It is used to pack the Java class and its associated resources into a single file.

Content:

Compiled .class file.

metadata (in Meta-inf/Manifest.mf).

• Library.
Usage:
As an independent application.

The sharing library of other applications (for example, the dependency item in Maven/Gradle).

• Create command:
Structure:

Key: Java applications or libraries are universal.

jar cf MyApp.jar -C compiled_classes_directory/ .

Ear (Enterprise Archive)

<code>MyApp.jar
├── META-INF/
│ └── MANIFEST.MF
├── com/
│ └── example/
│ └── MyClass.class</code>

Usage: It is used to pack corporate applications (multi -module applications) in the Java EE.

Content: <内容>
Multiple war and jar files.

deployment descriptive, such as Application.xml.

ENB (Enterprise Java Beans) module.

• Usage: It is deployed on servers that meet the Java EE standards, such as JBoss, Weblogic or Glassfish.
• Structure: <<>
• Key: Enterprise -level multi -module applications.

Tar (Tape Archive)

Uses: A general archive format is not limited to Java.

<code>MyApp.ear
├── META-INF/
│ └── application.xml
├── MyWebApp.war
└── MyEJBModule.jar</code>

Content: Any type of file (text, binary files, images, etc.).

Usage:
Arrow the files together for storage or transmission.

Usually used with compression (for example .tar.gz).

Create command:

Structure: There is no specific structure; it depends on the added file.
Summary:

War: Used for web applications. Jar: Used for library or independent Java applications. EAR: For enterprise -level multi -module applications. TAR: For general file archive (non -Java -specific).

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