jvm运行时环境属性一览

前言：

在web编程技术内幕中看到一个用apache组件进行文件下载的例子，对于DiskFileUpload类的setRepositoryPath方法，设置临时文件的存放路径，里面指出如果不调用该方法指定绝对路径。那么会使用"java.io.tempdir"这个环境属性的值。想到前面没有遇到过这个环境属性，这里列举出所有环境属性。代码如下：

         Properties properties = System.getProperties();
         Enumeration names = properties.propertyNames();
         String propertyName;
         while (names.hasMoreElements()) {
             propertyName = (String) names.nextElement();
             System.out.print(propertyName + ":");
             System.out.println(properties.getProperty(propertyName));
         }

getSysProps

运行结果如下：

 java.runtime.name:Java(TM) SE Runtime Environment
 sun.boot.library.path:E:\MyEclipse\JDK\1.8\jre\bin
 java.vm.version:25.101-b13
 java.vm.vendor:Oracle Corporation
 java.vendor.url:http://java.oracle.com/
 path.separator:;
 java.vm.name:Java HotSpot(TM) 64-Bit Server VM
 file.encoding.pkg:sun.io
 idea.launcher.port:7535
 user.script:
 user.country:CN
 sun.java.launcher:SUN_STANDARD
 sun.os.patch.level:Service Pack 1
 java.vm.specification.name:Java Virtual Machine Specification
 user.dir:E:\MyEclipse\workspace\ScriptEngine
 java.runtime.version:1.8.0_101-b13
 java.awt.graphicsenv:sun.awt.Win32GraphicsEnvironment
 java.endorsed.dirs:E:\MyEclipse\JDK\1.8\jre\lib\endorsed
 os.arch:amd64
 java.io.tmpdir:C:\Users\ADMINI~1\AppData\Local\Temp\
 line.separator:

 java.vm.specification.vendor:Oracle Corporation
 user.variant:
 os.name:Windows 7
 sun.jnu.encoding:GBK
 java.library.path:E:\MyEclipse\JDK\1.8\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;E:\Tools\jruby-9.1.2.0\bin;E:\MyEclipse\JDK\1.8\bin;C:\ProgramData\Oracle\Java\javapath;E:\Tools\jruby-9.1.2.0\bin;E:\Tools\Python3.6\Scripts\;E:\Tools\Python3.6\;.
 java.specification.name:Java Platform API Specification
 java.class.version:52.0
 sun.management.compiler:HotSpot 64-Bit Tiered Compilers
 os.version:6.1
 user.home:C:\Users\Administrator
 user.timezone:
 java.awt.printerjob:sun.awt.windows.WPrinterJob
 java.specification.version:1.8
 file.encoding:UTF-8
 idea.launcher.bin.path:E:\IntelliJ IDEA 2016.2.2\bin
 user.name:Administrator
 java.class.path:E:\MyEclipse\workspace\ScriptEngine\bin;E:\Tools\jpython\jython.jar;E:\MyEclipse\JDK\1.8\jre\lib\charsets.jar;E:\MyEclipse\JDK\1.8\jre\lib\deploy.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\access-bridge-64.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\cldrdata.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\dnsns.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\jaccess.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\jfxrt.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\localedata.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\nashorn.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\sunec.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\sunjce_provider.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\sunmscapi.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\sunpkcs11.jar;E:\MyEclipse\JDK\1.8\jre\lib\ext\zipfs.jar;E:\MyEclipse\JDK\1.8\jre\lib\javaws.jar;E:\MyEclipse\JDK\1.8\jre\lib\jce.jar;E:\MyEclipse\JDK\1.8\jre\lib\jfr.jar;E:\MyEclipse\JDK\1.8\jre\lib\jfxswt.jar;E:\MyEclipse\JDK\1.8\jre\lib\jsse.jar;E:\MyEclipse\JDK\1.8\jre\lib\management-agent.jar;E:\MyEclipse\JDK\1.8\jre\lib\plugin.jar;E:\MyEclipse\JDK\1.8\jre\lib\resources.jar;E:\MyEclipse\JDK\1.8\jre\lib\rt.jar;E:\Tools\jruby-9.1.2.0\lib\jruby.jar;E:\IntelliJ IDEA 2016.2.2\lib\idea_rt.jar
 java.vm.specification.version:1.8
 sun.arch.data.model:64
 java.home:E:\MyEclipse\JDK\1.8\jre
 sun.java.command:com.intellij.rt.execution.application.AppMain TestRuby
 java.specification.vendor:Oracle Corporation
 user.language:zh
 awt.toolkit:sun.awt.windows.WToolkit
 java.vm.info:mixed mode
 java.version:1.8.0_101
 java.ext.dirs:E:\MyEclipse\JDK\1.8\jre\lib\ext;C:\Windows\Sun\Java\lib\ext
 sun.boot.class.path:E:\MyEclipse\JDK\1.8\jre\lib\resources.jar;E:\MyEclipse\JDK\1.8\jre\lib\rt.jar;E:\MyEclipse\JDK\1.8\jre\lib\sunrsasign.jar;E:\MyEclipse\JDK\1.8\jre\lib\jsse.jar;E:\MyEclipse\JDK\1.8\jre\lib\jce.jar;E:\MyEclipse\JDK\1.8\jre\lib\charsets.jar;E:\MyEclipse\JDK\1.8\jre\lib\jfr.jar;E:\MyEclipse\JDK\1.8\jre\classes
 java.vendor:Oracle Corporation
 file.separator:\
 java.vendor.url.bug:http://bugreport.sun.com/bugreport/
 sun.cpu.endian:little
 sun.io.unicode.encoding:UnicodeLittle
 sun.desktop:windows
 sun.cpu.isalist:amd64

Result