System.getProperty

public void getSystemKey(){
 
File sysFile = new File("d:/study","sysFile.properties");
Properties sysPro = System.getProperties();
   try {
       sysPro.store(new FileOutputStream(sysFile), "Properties ClASS");
   } catch (FileNotFoundException e1) {
       e1.printStackTrace();
   } catch (IOException e) {
        e.printStackTrace();
    }
}

#Properties ClASS

#Wed Mar 18 16:04:29 CST 2015

java.runtime.name=Java(TM) SE Runtime Environment

sun.boot.library.path=D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\jre\\bin

java.vm.version=11.3-b02

java.vm.vendor=Sun Microsystems Inc.

java.vendor.url=http\://java.sun.com/

path.separator=;

java.vm.name=Java HotSpot(TM) Client VM

file.encoding.pkg=sun.io

sun.java.launcher=SUN_STANDARD

user.country=CN

sun.os.patch.level=

java.vm.specification.name=Java Virtual Machine Specification

user.dir=D\:\\workspace\\study\\2015-3-17Java-FileUpDown

java.runtime.version=1.6.0_13-b03

java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment

java.endorsed.dirs=D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\jre\\lib\\endorsed

os.arch=x86

java.io.tmpdir=C\:\\Users\\ADMINI~1\\AppData\\Local\\Temp\\

line.separator=\r\n

java.vm.specification.vendor=Sun Microsystems Inc.

user.variant=

os.name=Windows Vista

sun.jnu.encoding=GBK

java.library.path=D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\bin;.;C\:\\Windows\\Sun\\Java\\bin;C\:\\Windows\\system32;C\:\\Windows;D\:/InstallFiles/Genuitec/Common/binary/com.sun.java.jdk.win32.x86_1.6.0.013/jre/bin/client;D\:/InstallFiles/Genuitec/Common/binary/com.sun.java.jdk.win32.x86_1.6.0.013/jre/bin;C\:\\ProgramData\\Oracle\\Java\\javapath;C\:\\Program Files (x86)\\NVIDIA Corporation\\PhysX\\Common;C\:\\Windows\\system32;C\:\\Windows;C\:\\Windows\\System32\\Wbem;C\:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;D\:\\InstallFiles\\dzpk\\Java\\jdk1.6.0_24\\lib

java.specification.name=Java Platform API Specification

java.class.version=50.0

sun.management.compiler=HotSpot Client Compiler

os.version=6.2

user.home=C\:\\Users\\Administrator

user.timezone=Asia/Shanghai

java.awt.printerjob=sun.awt.windows.WPrinterJob

file.encoding=GBK

java.specification.version=1.6

java.class.path=D\:\\workspace\\study\\2015-3-17Java-FileUpDown\\WebRoot\\WEB-INF\\classes;D\:\\workspace\\study\\2015-3-17Java-FileUpDown\\WebRoot\\WEB-INF\\lib\\poi-3.11-20141221.jar;D\:\\workspace\\study\\2015-3-17Java-FileUpDown\\WebRoot\\WEB-INF\\lib\\commons-logging-1.1.3.jar;D\:\\workspace\\study\\2015-3-17Java-FileUpDown\\WebRoot\\WEB-INF\\lib\\junit-4.11.jar;D\:\\workspace\\study\\2015-3-17Java-FileUpDown\\WebRoot\\WEB-INF\\lib\\log4j-1.2.17.jar

user.name=Administrator

java.vm.specification.version=1.0

java.home=D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\jre

sun.arch.data.model=32

user.language=zh

java.specification.vendor=Sun Microsystems Inc.

awt.toolkit=sun.awt.windows.WToolkit

java.vm.info=mixed mode

java.version=1.6.0_13

java.ext.dirs=D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\jre\\lib\\ext;C\:\\Windows\\Sun\\Java\\lib\\ext

sun.boot.class.path=D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\jre\\lib\\resources.jar;D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\jre\\lib\\rt.jar;D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\jre\\lib\\sunrsasign.jar;D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\jre\\lib\\jsse.jar;D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\jre\\lib\\jce.jar;D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\jre\\lib\\charsets.jar;D\:\\InstallFiles\\Genuitec\\Common\\binary\\com.sun.java.jdk.win32.x86_1.6.0.013\\jre\\classes;D\:\\InstallFiles\\Genuitec\\Common\\plugins\\com.genuitec.eclipse.j2eedt.core_8.6.1.me201010211225\\data\\libraryset\\EE_5\\javaee.jar;D\:\\InstallFiles\\Genuitec\\Common\\plugins\\com.genuitec.eclipse.j2eedt.core_8.6.1.me201010211225\\data\\libraryset\\EE_5\\jsf-impl.jar;D\:\\InstallFiles\\Genuitec\\Common\\plugins\\com.genuitec.eclipse.j2eedt.core_8.6.1.me201010211225\\data\\libraryset\\EE_5\\jsf-api.jar;D\:\\InstallFiles\\Genuitec\\Common\\plugins\\com.genuitec.eclipse.j2eedt.core_8.6.1.me201010211225\\data\\libraryset\\EE_5\\jstl-1.2.jar

java.vendor=Sun Microsystems Inc.

file.separator=\\

java.vendor.url.bug=http\://java.sun.com/cgi-bin/bugreport.cgi

sun.io.unicode.encoding=UnicodeLittle

sun.cpu.endian=little

sun.desktop=windows