这是我从网上看一遍文章做的练习。自解压程序是 ZipSelfExtractor.java（请下载），作者为 Z.S. Jin。一、自解压jar文件的优点： 自解压jar文件可以在任意支持java的平台上解开。二、 制作自解压jar文件的过程如下：1、修改MANIFEST.MF文件    随便找一个jar格式的文件，如jstl.jar，先用winzip或winRAR解压,这是因为我们要修改其中的MANIFEST.MF文件。其实修改很简单，只要在MANIFEST.MF文件中指定（或修改）这个基于java 的解压程序包含main()方法的类的名称为：    Main-Class: ZipSelfExtractor 如将jstl.jar文件中包含的MANIFEST.MF文件:Manifest-Version: 1.0Ant-Version: Apache Ant 1.5.2 Created-By: 1.4.1_02-b06 (Sun Microsystems Inc.)Specification-Title: JavaServer Pages Standard Tag Library (JSTL)Specification-Version: 1.1Implementation-Title: JavaServer Pages Standard Tag Library API Reference ImplementationImplementation-Version: 1.1.0-D13Implementation-Vendor: Sun Microsystems, Inc.Implementation-Vendor-Id: com.sunExtension-Name: javax.servlet.jsp.jstl 改为:Manifest-Version: 1.0Main-Class: ZipSelfExtractorAnt-Version: Apache Ant 1.5.2 Created-By: 1.4.1_02-b06 (Sun Microsystems Inc.)Specification-Title: JavaServer Pages Standard Tag Library (JSTL)Specification-Version: 1.1Implementation-Title: JavaServer Pages Standard Tag Library API Reference ImplementationImplementation-Version: 1.1.0-D13Implementation-Vendor: Sun Microsystems, Inc.Implementation-Vendor-Id: com.sunExtension-Name: javax.servlet.jsp.jstl2、更新jstl.jar文件在命令行执行如下命令：D:\java>jar uvfm jstl.jar manifest.mf ZipSelfExtractor.class 下面是屏幕显示：2005-9-17 11:05:10 java.util.jar.Attributes read警告: Duplicate name in Manifest: Manifest-Version2005-9-17 11:05:10 java.util.jar.Attributes read警告: Duplicate name in Manifest: Main-Class2005-9-17 11:05:10 java.util.jar.Attributes read警告: Duplicate name in Manifest: Ant-Version2005-9-17 11:05:10 java.util.jar.Attributes read警告: Duplicate name in Manifest: Created-By2005-9-17 11:05:10 java.util.jar.Attributes read警告: Duplicate name in Manifest: Specification-Title2005-9-17 11:05:10 java.util.jar.Attributes read警告: Duplicate name in Manifest: Specification-Version2005-9-17 11:05:10 java.util.jar.Attributes read警告: Duplicate name in Manifest: Implementation-Version2005-9-17 11:05:10 java.util.jar.Attributes read警告: Duplicate name in Manifest: Implementation-Vendor2005-9-17 11:05:10 java.util.jar.Attributes read警告: Duplicate name in Manifest: Implementation-Vendor-Id2005-9-17 11:05:10 java.util.jar.Attributes read警告: Duplicate name in Manifest: Extension-Name更新清单(manifest)增加：ZipSelfExtractor.class(读入= 5290) (写出= 3031)(压缩了 42%) D:\java> 三、测试双击更新后的jstl.jar文件或在命令行输入： java -jar jstl.jar 你将看到如下窗口，选择解压文件存放目录，OK！

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