如何使用sbtassembly在sbt中禁用jar壓縮？

我感興趣的是構建未壓縮的jar文件，以便在只有幾個類更改時使我的rsync更快，到目前爲止，我無法弄清楚如何告訴sbtassembly禁用壓縮。如何使用sbtassembly在sbt中禁用jar壓縮？

server > inspect assembly 
[info] Task: java.io.File 
[info] Description: 
[info] Builds a single-file deployable jar. 
[info] Provided by: 
[info] {file:/.../}server/*:assembly 
[info] Dependencies: 
[info] server/*:assembly-merge-strategy(for assembly) 
[info] server/*:assembly-output-path(for assembly) 
[info] server/*:package-options(for assembly) 
[info] server/*:assembly-assembled-mappings(for assembly) 
[info] server/*:cache-directory 
[info] server/*:test(for assembly) 
[info] server/*:streams(for assembly) 
[info] Delegates: 
[info] server/*:assembly 
[info] {.}/*:assembly 
[info] */*:assembly

...

server > inspect assembly-option(for assembly) 
[info] Setting: sbtassembly.AssemblyOption = AssemblyOption(true,true,true,<function1>) 
[info] Description: 
[info] 
[info] Provided by: 
[info] {file:/.../}server/*:assembly-option(for assembly) 
[info] Dependencies: 
[info] server/*:assembly-assemble-artifact(for package-bin) 
[info] server/*:assembly-assemble-artifact(for assembly-package-scala) 
[info] server/*:assembly-assemble-artifact(for assembly-package-dependency) 
[info] server/*:assembly-excluded-files(for assembly) 
...

AssemblyOption並沒有說明什麼包裝，然而，和插件似乎使用SBT自己Package對於這一點，所以也許有配置是方式？程序包反過來調用IO.jar(...)來寫入文件。這使用withZipOutput來創建一個ZipOutputStream（或JarOutputStream），我想打電話給setMethod(ZipOutputStream.STORED)，但我不能。

除了sbt功能請求以外的任何想法？

來源

2012-11-20 Rob Starling

無法通過sbt配置直接執行此操作，因爲sbt假定zip和jar工件中的任何文件都應該被壓縮。

解決方法之一是解壓縮並重新壓縮（不壓縮）jar文件。

packageBin in Compile <<= packageBin in Compile map { file => 
    println("(Re)packaging with zero compression...") 
    import java.io.{FileInputStream,FileOutputStream,ByteArrayOutputStream} 
    import java.util.zip.{CRC32,ZipEntry,ZipInputStream,ZipOutputStream} 
    val zis = new ZipInputStream(new FileInputStream(file)) 
    val tmp = new File(file.getAbsolutePath + "_decompressed") 
    val zos = new ZipOutputStream(new FileOutputStream(tmp)) 
    zos.setMethod(ZipOutputStream.STORED) 
    Iterator.continually(zis.getNextEntry). 
    takeWhile(ze => ze != null). 
    foreach { ze => 
     val baos = new ByteArrayOutputStream 
     Iterator.continually(zis.read()). 
     takeWhile(-1 !=). 
     foreach(baos.write) 
     val bytes = baos.toByteArray 
     ze.setMethod(ZipEntry.STORED) 
     ze.setSize(baos.size) 
     ze.setCompressedSize(baos.size) 
     val crc = new CRC32 
     crc.update(bytes) 
     ze.setCrc(crc.getValue) 
     zos.putNextEntry(ze) 
     zos.write(bytes) 
     zos.closeEntry 
     zis.closeEntry 
    } 
    zos.close 
    zis.close 
    tmp.renameTo(file) 
    file 
}

現在，當您運行在SBT package，最終的jar文件將是未壓縮的，您可以與驗證：您可以通過添加以下設置到您的項目（例如，在build.sbt）做到這一點unzip -vl path/to/package.jar。

來源

2013-08-16 21:35:40 earldouglas

如何使用sbtassembly在sbt中禁用jar壓縮？

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