java包下的META-INF文件夹下的MANIFEST.MF文件有神马作用 android客户端

2025-02-11 09:38:22
推荐回答(2个)
回答1:

META-INF文件夹中的MANIFEST.MF 的作用:

这个文件夹里面有文件:MANIFEST.MF

Manifest-Version: 1.0

Ant-Version: Apache Ant 1.7.1

Created-By: 14.0-b16 (Sun Microsystems Inc.)

Main-Class: com.hadeslee.yoyoplayer.player.ui.Main

Class-Path: lib/commons-codec-1.3.jar lib/commons-httpclient-3.1.jar l

 ib/commons-logging-1.1.jar lib/commons-logging-api.jar lib/examples.j

 ar lib/jflac-1.2.jar lib/jl1.0.jar lib/jmactritonusspi1.74.jar lib/jn

 a.jar lib/jogg-0.0.7.jar lib/jorbis-0.0.15.jar lib/jspeex0.9.7.jar li

 b/junit-4.4.jar lib/kj_dsp1.1.jar lib/mp3spi1.9.4.jar lib/tritonus_sh

 are.jar lib/vorbisspi1.0.2.jar

X-COMMENT: Main-Class will be added automatically by build

 

我们把MANIFEST中的配置信息进行分类,可以归纳出下面几个大类:

 

  一. 一般属性

  1. Manifest-Version

  用来定义manifest文件的版本,例如:Manifest-Version: 1.0

  2. Created-By

  声明该文件的生成者,一般该属性是由jar命令行工具生成的,例如:Created-By: Apache Ant 1.5.1

  3. Signature-Version

  定义jar文件的签名版本

  4. Class-Path

  应用程序或者类装载器使用该值来构建内部的类搜索路径

  二. 应用程序相关属性

  1. Main-Class

  定义jar文件的入口类,该类必须是一个可执行的类,一旦定义了该属性即可通过 java -jar x.jar来运行该jar文件。

  三. 小程序(Applet)相关属性

  1. Extendsion-List

  该属性指定了小程序需要的扩展信息列表,列表中的每个名字对应以下的属性

  2. -Extension-Name

  3. -Specification-Version

  4. -Implementation-Version

  5. -Implementation-Vendor-Id

  5. -Implementation-URL

  四. 扩展标识属性

  1. Extension-Name

  该属性定义了jar文件的标识,例如Extension-Name: Struts Framework

  五. 包扩展属性

  1. Implementation-Title 定义了扩展实现的标题

  2. Implementation-Version 定义扩展实现的版本

  3. Implementation-Vendor 定义扩展实现的组织 

  4. Implementation-Vendor-Id 定义扩展实现的组织的标识

  5. Implementation-URL : 定义该扩展包的下载地址(URL)

  6. Specification-Title 定义扩展规范的标题

  7. Specification-Version 定义扩展规范的版本

  8. Specification-Vendor 声明了维护该规范的组织

  9. Sealed 定义jar文件是否封存,值可以是true或者false (这点我还不是很理解)

  六. 签名相关属性

  签名方面的属性我们可以来参照JavaMail所提供的mail.jar中的一段

  Name: javax/mail/Address.class

  Digest-Algorithms: SHA MD5 

  SHA-Digest: AjR7RqnN//cdYGouxbd06mSVfI4=

  MD5-Digest: ZnTIQ2aQAtSNIOWXI1pQpw==

  这段内容定义类签名的类名、计算摘要的算法名以及对应的摘要内容(使用BASE64方法进行编码)

 

 

android客户端服务器java文件应该如何部署到tomcat

1、将java程序编译成.class文件,复制到tomcat中你的项目里的相应位置。

2、现在很多开发工具可以方便的部署java程序到tomcat,比如eclipse

通过add和remove来部署你的项目,通过publish来部署项目到tomcat你所设定的位置,默认是[盘符]:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps

回答2:

MANIFEST.MF是一个文本文件,里面记录了包里面所有文件的SHA1值
META-INF文件夹其实就是包的签名,如果修改了包的内容后,签名中记录的值和文件不匹配就会导致文件无法使用!

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