Groovy在此处的行为使我感到困惑。我已经运行了一些调试器,试图确定动态混合器中的哪些位置,这些代码路径可能会越过,但是想知道是否有人可以直接在这里设置我。使用Groovy中的GStrings设置/获取系统属性时的不同结果
基本上,在为一个值设置一个GString的系统属性,这取决于我如何设置属性,该属性并不总是通过某些方法可读。
我看过Why Map does not work for GString in Groovy?和Why groovy does not see some values in dictionary?但我的问题特别适用于地图值,所以不确定那些适用或不适用?
段:
def tdollar='dollar'
System.setProperty('key1', 'value1')
System.setProperty('key2', "value2$tdollar")
// Replace the below with any property setting method other than
// the above with the same results
System.properties['key4']='value4'
System.properties['key5']="value5$tdollar"
println System.hasProperty('key1')
println System.hasProperty('key2')
println System.hasProperty('key4')
println System.hasProperty('key5')
println
println System.getProperty('key1')
println System.getProperty('key2')
println System.getProperty('key4')
println System.getProperty('key5')
println
println System.properties.keySet()
println
println System.properties['key1']
println System.properties['key2']
println System.properties['key4']
println System.properties['key5']
输出:
null
null
null
null
value1
value2dollar
value4
null
[java.runtime.name, sun.boot.library.path, java.vm.version, gopherProxySet, java.vm.vendor, java.vendor.url, path.separator, java.vm.name, file.encoding.pkg, user.country, sun.java.launcher, sun.os.patch.level, program.name, key5, key4, java.vm.specification.name, user.dir, key2, java.runtime.version, key1, java.awt.graphicsenv, java.endorsed.dirs, os.arch, java.io.tmpdir, line.separator, java.vm.specification.vendor, os.name, tools.jar, sun.jnu.encoding, script.name, java.library.path, java.specification.name, java.class.version, sun.management.compiler, os.version, user.home, user.timezone, java.awt.printerjob, file.encoding, java.specification.version, java.class.path, user.name, java.vm.specification.version, sun.java.command, java.home, sun.arch.data.model, user.language, java.specification.vendor, awt.toolkit, java.vm.info, java.version, java.ext.dirs, sun.boot.class.path, java.vendor, file.separator, java.vendor.url.bug, sun.io.unicode.encoding, sun.cpu.endian, groovy.starter.conf, groovy.home, sun.cpu.isalist]
value1
value2dollar
value4
value5dollar
为什么,如果我不使用System.setProperty(key, value)
语法,是物业通过System.getProperty(key)
不可读,但仍是可读通过任何其他方法?
鉴于此行为,有没有关于Groovy中系统属性的最佳实践记录。
写这个,我不知道这只是一个普遍的地图问题。将测试。
看到这个答案,深入了解Java的Properties'''对象的'''奇怪的行为:HTTP:/ /stackoverflow.com/questions/39038580/using-groovy-for-variable-expansion-in-java-properties/39043586#39043586 – BalRog