Question

我有2个文件，＆＃34; launcher.jar＆＃34;和＆＃34; camStudio.jar＆＃34;我需要合并。我决定尝试使用批处理代码执行此操作：

copy /b launcher.jar + camStudio.jar file.jar

然而，由此产生的＆＃34; file.jar＆＃34;仅包含＆＃34; camStudio.jar＆＃34;的内容。如何防止＆＃34; launcher.jar＆＃34;中的文件？被删除？

Answer 1

组合两个.jar文件的内容比从命令行调用copy要复杂一些。 .jar文件不是普通目录，而是一种压缩文件，因此您需要使用特殊的实用程序来操作它们。幸运的是，这些工具附带标准的JKD。

JDK附带了实用程序jar，用于操作.jar文件并不令人惊讶。它的用法描述如下：

Usage: jar {ctxui}[vfmn0Me] [jar-file] [manifest-file] [entry-point] [-C dir] files ...
Options:
    -c  create new archive
    -t  list table of contents for archive
    -x  extract named (or all) files from archive
    -u  update existing archive
    -v  generate verbose output on standard output
    -f  specify archive file name
    -m  include manifest information from specified manifest file
    -n  perform Pack200 normalization after creating a new archive
    -e  specify application entry point for stand-alone application
        bundled into an executable jar file
    -0  store only; use no ZIP compression
    -M  do not create a manifest file for the entries
    -i  generate index information for the specified jar files
    -C  change to the specified directory and include the following file
If any file is a directory then it is processed recursively.
The manifest file name, the archive file name and the entry point name are
specified in the same order as the 'm', 'f' and 'e' flags.

Example 1: to archive two class files into an archive called classes.jar:
       jar cvf classes.jar Foo.class Bar.class
Example 2: use an existing manifest file 'mymanifest' and archive all the
           files in the foo/ directory into 'classes.jar':
       jar cvfm classes.jar mymanifest -C foo/ .

用于合并两个.jar文件的相关命令是x和c。即使这样，组合.jar文件也需要一两行，所以我将这些.bat文件放在一起以自动化它。

:: Pass one or more .jar files as command line arguments
:: Combine_Jar [file1] [file2 ...]
:: Combine_Jar Test.jar
:: Combine_Jar Test.jar Test2.jar Test3.jar
@echo off & setlocal enabledelayedexpansion

set "jarDir=%cd%"
set "newJar="
set "folders="
pushd %temp%
for %%a in (%*) do (
    call :extract %%a
    set "newJar=!newJar!_%%~na_"
)



set "tempDirs=!newJar:_=^"!"
set "tempDirs=%tempDirs:^"^"=^" ^"%"

set "newJar=!newJar:~1,-1!.jar"
set "newJar=!newJar:__=_!"
if exist "!newJar!" del /Q "!newJar!"

jar cf "!newJar!" %tempDirs%

for %%a in (%*) do call rd /s /q  "%%~na"

move /Y "!newJar!" "%jarDir%" > nul
popd
exit /B

:extract
set "tempDir=%~n1"

if exist "%tempDir%" (
    rd /s /q "%tempDir%"
)
md "%tempDir%"

pushd "%tempDir%"
jar xf "%jarDir%\%~1"
popd
exit /B

将所有jar文件作为参数传递到单个jar文件中。

执行复制/合并时批量删除文件

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