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Java Jar Files

Java Jar Files. Bar-Ilan University 2004-2005 תשס"ה by Moshe Fresko. Why Jar Files ?. The Java TM Archive (JAR) file format enables one to bundle multiple files into a single archive file. JAR provides many benefits Security Decreased download time Compression

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Java Jar Files

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  1. Java Jar Files Bar-Ilan University 2004-2005 תשס"ה by Moshe Fresko

  2. Why Jar Files ? • The JavaTM Archive (JAR) file format enables one to bundle multiple files into a single archive file. • JAR provides many benefits • Security • Decreased download time • Compression • Packaging for extensions • Package sealing • Package versioning • Portability

  3. Jar Basics • Using Jar Tool provided by JDK • To create a jar file • jar cf jar-file input-file(s) • To view the contents of a jar file • jar tf jar-file • Extract the contents of a jar file • jar xf jar-file • To run an application package • java -jar app.jar • To invoke an applet packaged as a JAR file • <applet code=MyApplet.class archive=“MyJar.jar" width=100 height=50> </applet>

  4. Manifest File • When you create a JAR file, it automatically receives a default manifest file. • META-INF/MANIFEST.MF Manifest-Version: 1.0 Created-By: 1.4.2 (Sun Microsystems Inc.) • Application in a JAR file. • The class name having main(String[]) Main-Class: classname

  5. Manifest File • Package Sealing Name: myCompany/myPackage/ Sealed: true • Package Versioning Name: java/util/ Specification-Title: "Java Utility Classes" Specification-Version: "1.2" Specification-Vendor: "Sun Microsystems, Inc.". Implementation-Title: "java.util" Implementation-Version: "build57" Implementation-Vendor: "Sun Microsystems, Inc."

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