META-INF文件夾是幹啥的，META-INF文件夾的做用， META-INF文件夾能刪嗎

時間 2019-11-11

標籤 meta inf 文件夾幹啥欄目 HTML5 简体版

原文原文鏈接

今天有人問到 META-INF文件夾是幹啥的，META-INF文件夾的做用， META-INF文件夾能刪嗎，還有項目的META-INF下面通常會有個MANIFEST.MF 文件，都是幹啥的。html

百度搜了一下，基本找不到答案。因而上stakoverflow搜，獲得以下答案：java

If you remove META-INF from a jar then there is no MANIFEST.MF and so java -jar can't find the main class.apache

You can create jars without META-INF but when you are going to execute a jar a META-INF/MANIFEST.MF is required.oracle

See http://docs.oracle.com/javase/7/docs/technotes/guides/jar/jar.htmleclipse

這句英文很簡單，簡單翻譯以下：ide

若是你將Jar中的META-INF文件夾刪除，那麼jar文件裏邊就沒有MANIFEST.MF文件。那麼，java -jar就找不到main class.ui

沒有META-INF你仍然能夠建立一個Jar文件。可是，當你想要執行jar文件的時候，這個jar是須要具有 META-INF/MANIFEST.MF的。翻譯

咱們在使用eclipse或者myeclipse新建項目以後，在項目中能夠找到META-INF文件夾，下面有個MANIFEST.MF。htm

打開以後發現裏邊只有：blog

Manifest-Version: 1.0
Class-Path:

瞬間變有疑問：這麼少點信息，有啥做用。爲啥上面那段英文說的這個文件這麼的不可或缺。

因而我隨便在項目的lib中找了一個jar文件commons-io-2.3.jar，打開，把裏邊的MANIFEST.MF文件拿出來，打開以下：

Manifest-Version: 1.0
Export-Package: org.apache.commons.io.output;version="2.3",org.apache.
 commons.io.monitor;version="2.3",org.apache.commons.io.filefilter;ver
 sion="2.3",org.apache.commons.io.comparator;version="2.3",org.apache.
 commons.io.input;version="2.3",org.apache.commons.io;version="2.3"
Implementation-Title: Commons IO
Built-By: ggregory
Tool: Bnd-1.50.0
Implementation-Vendor: The Apache Software Foundation
Implementation-Vendor-Id: org.apache
Specification-Title: Commons IO
Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txt
Bundle-SymbolicName: org.apache.commons.io
X-Compile-Target-JDK: 1.6
Implementation-Version: 2.3
Specification-Vendor: The Apache Software Foundation
Bundle-Name: Commons IO
Created-By: Apache Maven Bundle Plugin
X-Compile-Source-JDK: 1.6
Bundle-Vendor: The Apache Software Foundation
Build-Jdk: 1.6.0_31
Bundle-Version: 2.3.0
Bnd-LastModified: 1334069963279
Bundle-ManifestVersion: 2
Bundle-Description: The Commons IO library contains utility classes, s
 tream implementations, file filters, file comparators, endian transfo
 rmation classes, and much more.
Bundle-DocURL: http://commons.apache.org/io/
Implementation-Build: tags/2.3-RC1@r1311772; 2012-04-10 10:59:15-0400
Specification-Version: 2.3
Include-Resource: META-INF/LICENSE.txt=LICENSE.txt,META-INF/NOTICE.txt
 =NOTICE.txt
Archiver-Version: Plexus Archiver

　　密密麻麻一大片，是一行行的，相似配置文件，前面一個'key' 後面一個‘value’

具體這些玩意有啥用，META-INF 裏邊還能夠放啥，可擊上面文字中提供的的鏈接。好長一片英文，感興趣的話，慢慢看吧。