JAVA 程序启动时System中所带的变量信息

        最近开始看tomcat的源码，发现在在tomcat启动的时候有这样一行代码：

      

  File bootstrapJar =            new File(System.getProperty("user.dir"), "bootstrap.jar");

感觉比较奇怪，程序在之前并没有setProperty（“user.dir”）,所这样看啦，这个应该是java虚拟机启动时加载的内容。

所以写了几行测试代码看java虚拟机启动时其它的内容是什么：

package cn.com.casco.tomcat.test;import java.util.Properties;import java.util.Set;public class Test001 {/** * @param args *  * @author 61228 *  * 测试java程序启动时 System内所带的变量信息 */public static void main(String[] args) {// TODO Auto-generated method stubProperties properties=System.getProperties();Set<Object> set=properties.keySet();for (Object string : set) {String str=properties.getProperty((String)string);System.out.println(string+"    "+str);}}}

在我的机器上运行的结果如下：

java.runtime.name    Java(TM) SE Runtime Environmentsun.boot.library.path    D:\Java\jdk1.6.0_43\jre\binjava.vm.version    20.14-b01java.vm.vendor    Sun Microsystems Inc.java.vendor.url    http://java.sun.com/path.separator    ;java.vm.name    Java HotSpot(TM) 64-Bit Server VMfile.encoding.pkg    sun.iosun.java.launcher    SUN_STANDARDuser.country    CNsun.os.patch.level    Service Pack 1java.vm.specification.name    Java Virtual Machine Specificationuser.dir    D:\jamesworkspace\TestTomcatjava.runtime.version    1.6.0_43-b01java.awt.graphicsenv    sun.awt.Win32GraphicsEnvironmentjava.endorsed.dirs    D:\Java\jdk1.6.0_43\jre\lib\endorsedos.arch    amd64java.io.tmpdir    C:\Users\61228\AppData\Local\Temp\line.separator    java.vm.specification.vendor    Sun Microsystems Inc.user.variant    os.name    Windows 7sun.jnu.encoding    GBKjava.library.path    D:\Java\jdk1.6.0_43\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;D:/Java/jdk1.6.0_43/bin/../jre/bin/server;D:/Java/jdk1.6.0_43/bin/../jre/bin;D:/Java/jdk1.6.0_43/bin/../jre/lib/amd64;F:\61228\app\product\11.1.0\db_1\bin;C:\PROGRAM FILES (X86)\INTEL\ICLS CLIENT\;C:\PROGRAM FILES\INTEL\ICLS CLIENT\;C:\Windows\SYSTEM32;C:\Windows;C:\Windows\SYSTEM32\WBEM;C:\Windows\SYSTEM32\WINDOWSPOWERSHELL\V1.0\;C:\PROGRAM FILES\INTEL\INTEL(R) MANAGEMENT ENGINE COMPONENTS\DAL;C:\PROGRAM FILES\INTEL\INTEL(R) MANAGEMENT ENGINE COMPONENTS\IPT;C:\PROGRAM FILES (X86)\INTEL\INTEL(R) MANAGEMENT ENGINE COMPONENTS\DAL;C:\PROGRAM FILES (X86)\INTEL\INTEL(R) MANAGEMENT ENGINE COMPONENTS\IPT;C:\PROGRAM FILES (X86)\INTEL\OPENCL SDK\3.0\BIN\X86;C:\PROGRAM FILES (X86)\INTEL\OPENCL SDK\3.0\BIN\X64;;C:\Program Files\ThinkPad\Bluetooth Software\;C:\Program Files\ThinkPad\Bluetooth Software\syswow64;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;D:\Java\jdk1.6.0_43\bin;D:\Program Files\eclipsejee\eclipse;;.java.specification.name    Java Platform API Specificationjava.class.version    50.0sun.management.compiler    HotSpot 64-Bit Tiered Compilersos.version    6.1user.home    C:\Users\61228user.timezone    java.awt.printerjob    sun.awt.windows.WPrinterJobfile.encoding    GBKjava.specification.version    1.6java.class.path    D:\jamesworkspace\TestTomcat\binuser.name    61228java.vm.specification.version    1.0sun.java.command    cn.com.casco.tomcat.test.Test001java.home    D:\Java\jdk1.6.0_43\jresun.arch.data.model    64user.language    zhjava.specification.vendor    Sun Microsystems Inc.awt.toolkit    sun.awt.windows.WToolkitjava.vm.info    mixed modejava.version    1.6.0_43java.ext.dirs    D:\Java\jdk1.6.0_43\jre\lib\ext;C:\Windows\Sun\Java\lib\extsun.boot.class.path    D:\Java\jdk1.6.0_43\jre\lib\resources.jar;D:\Java\jdk1.6.0_43\jre\lib\rt.jar;D:\Java\jdk1.6.0_43\jre\lib\sunrsasign.jar;D:\Java\jdk1.6.0_43\jre\lib\jsse.jar;D:\Java\jdk1.6.0_43\jre\lib\jce.jar;D:\Java\jdk1.6.0_43\jre\lib\charsets.jar;D:\Java\jdk1.6.0_43\jre\lib\modules\jdk.boot.jar;D:\Java\jdk1.6.0_43\jre\classesjava.vendor    Sun Microsystems Inc.file.separator    \java.vendor.url.bug    http://java.sun.com/cgi-bin/bugreport.cgisun.io.unicode.encoding    UnicodeLittlesun.cpu.endian    littlesun.desktop    windowssun.cpu.isalist    amd64

总结：自己要学的还很多，貌似信息还满全面的，很多在以后编程的时候还可以用上，比方说说user.language 和user.country之类的。