Java 如何为 Gradle 项目生成类路径？
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How do I generate the class path for a Gradle project?
提问by Sriram Subramanian
I have a gradle project with multiple packages. After the build, each package generates its jar files in build/libs. The external jar dependencies are pulled into ~/.gradle. I would now like to run the service locally from the commandline with the appropriate classpath. For this purpose, I am writing a script that constructs the classpath. The problem is that the script does not understand all the external dependencies and hence cannot construct the classpath. Is there a way for gradle to help with this? Ideally, I would like to dump all the dependencies into a folder at the end of the build.
我有一个包含多个包的 gradle 项目。构建完成后，每个包都会在 build/libs 中生成它的 jar 文件。外部 jar 依赖项被拉入 ~/.gradle。我现在想从命令行使用适当的类路径在本地运行该服务。为此，我正在编写一个构建类路径的脚本。问题在于脚本不了解所有外部依赖项，因此无法构建类路径。gradle 有没有办法帮助解决这个问题？理想情况下，我想在构建结束时将所有依赖项转储到一个文件夹中。
回答by zagyi
You could try something like this in your build script:
你可以在你的构建脚本中尝试这样的事情：
// add an action to the build task that creates a startup shell script
build << {
File script = file('start.sh')
script.withPrintWriter {
it.println '#!/bin/sh'
it.println "java -cp ${getRuntimeClasspath()} com.example.Main \"$@\""
}
// make it executable
ant.chmod(file: script.absolutePath, perm: 'u+x')
}
String getRuntimeClasspath() {
sourceSets.main.runtimeClasspath.collect { it.absolutePath }.join(':')
}
回答by Tom Anderson
Firstly, i would suggest using the application pluginif you can, since it takes care of this already.
首先，如果可以的话，我建议使用应用程序插件，因为它已经解决了这个问题。
If you want to dump the classpath to a file yourself, the simplest way is something like:
如果您想自己将类路径转储到文件中，最简单的方法是：
task writeClasspath << {
buildDir.mkdirs()
new File(buildDir, "classpath.txt").text = configurations.runtime.asPath + "\n"
}
If you want to actually copy all the libraries on the classpath into a directory, you can do:
如果要将类路径上的所有库实际复制到目录中，可以执行以下操作：
task copyDependencies(type: Copy) {
from configurations.runtime
into new File(buildDir, "dependencies")
}
