import java.util.Iterator;
import java.util.Properties;
import java.util.Set;
import java.util.Map.Entry;
 
public class SystemInfo {
    public static void main(String[] args){
        String os = System.getProperty("os.name");
        System.out.println(os);
        Properties ps = System.getProperties();
        Set<Entry<Object, Object>> set = ps.entrySet();
        Iterator<Entry<Object, Object>> it = set.iterator();
        while(it.hasNext()){
            Entry<Object, Object> e = it.next();
            System.out.println(e.getKey() + "=" + e.getValue());
        }
    }
}

输出:

java.runtime.name=Java(TM) SE Runtime Environment
sun.boot.library.path=/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/lib
java.vm.version=23.7-b01
gopherProxySet=false
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
user.country=CN
sun.java.launcher=SUN_STANDARD
sun.os.patch.level=unknown
java.vm.specification.name=Java Virtual Machine Specification
user.dir=/Users/penngo/Documents/workspace/meet
java.runtime.version=1.7.0_15-b03
java.awt.graphicsenv=sun.awt.CGraphicsEnvironment
java.endorsed.dirs=/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/lib/endorsed
os.arch=x86_64
java.io.tmpdir=/var/folders/pn/91tlb5xs16958737mj6b_9700000gn/T/
line.separator=


java.vm.specification.vendor=Oracle Corporation
os.name=Mac OS X
sun.jnu.encoding=US-ASCII
java.library.path=/Users/penngo/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
java.specification.name=Java Platform API Specification
java.class.version=51.0
sun.management.compiler=HotSpot 64-Bit Tiered Compilers
os.version=10.8.3
http.nonProxyHosts=local|*.local|169.254/16|*.169.254/16
user.home=/Users/penngo
user.timezone=
java.awt.printerjob=sun.lwawt.macosx.CPrinterJob
file.encoding=UTF-8
java.specification.version=1.7
java.class.path=/Users/penngo/Documents/workspace/meet/bin:/Users/penngo/Documents/workspace/meet/lib/commons-dbutils-1.4.jar
user.name=penngo
java.vm.specification.version=1.7
sun.java.command=com.fymeet.test.Test
java.home=/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre
sun.arch.data.model=64
user.language=zh
java.specification.vendor=Oracle Corporation
awt.toolkit=sun.lwawt.macosx.LWCToolkit
java.vm.info=mixed mode
java.version=1.7.0_15
java.ext.dirs=/Users/penngo/Library/Java/Extensions:/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/lib/ext:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
sun.boot.class.path=/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/lib/sunrsasign.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/lib/JObjC.jar:/Library/Java/JavaVirtualMachines/jdk1.7.0_15.jdk/Contents/Home/jre/classes
java.vendor=Oracle Corporation
file.separator=/
java.vendor.url.bug=http://bugreport.sun.com/bugreport/
sun.io.unicode.encoding=UnicodeBig
sun.cpu.endian=little
socksNonProxyHosts=local|*.local|169.254/16|*.169.254/16
ftp.nonProxyHosts=local|*.local|169.254/16|*.169.254/16
sun.cpu.isalist=