Archive Files

• Java Archive file(JAR)
• JAR is an acronym of Java archive
• JAR is a compressed format of a compiled Java project.
• Contains .class files And some metadata And some other resources.
• Used to distribute Java code/libraries for use by other projects.
• To create a jar file Using eclipse go to project right Click on the project And select export.
• To execute jar from terminal use
• java -jar filename.jar
• When we decompress a jar file We get our package and class file along with a folder Meta-INF which has a MANIFEST.MF
• The manifest file describes the Java file.
• Create jar from console
• jar -cf test.jar package-name
• View Data in Jar
• jar -tf test.jar
• Add new package in jar
• Jar -uf test.jar new-package
• WAR file
• War file Is An abbreviation of web archive.
• War is used to deploy web applications on different servers.
• WAR bundles, HTML, pages, servlets, JSP, and web.xml And other files related to web development.
• WAR helps us to easily deliver and deploy projects.
• A WAR file represents one web application.
• web.xml Contains the web metadata info of the WAR file.
• EAR files
• EAR files are an Abbreviation of Enterprise Archive Files.
• Represents Enterprise application.
• Contains anything from Java J2EE for example EJB, JMS,Servlets, JSP’s, EJB’s, JMS et cetera.
• In many cases, EAR contains both WAR and JAR files.
• It contains a descriptor called as manifest.
• app.xml contains the metadata info of the EAR file.