一、JVM已经帮我们读取了系统信息

public void testSystemParam(){
    Properties p = System.getProperties();
    Iterator it = p.entrySet().iterator();
    while(it.hasNext()){
        Map.Entry entry = (Map.Entry) it.next();
        System.out.println(entry.getKey()+" : "+entry.getValue());
    }
}

二、Windows下的结果实例

java.runtime.name : Java(TM) SE Runtime Environment
sun.boot.library.path : C:\Program Files\Java\jdk1.8.0_141\jre\bin
java.vm.version : 25.141-b15
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
user.script : 
sun.java.launcher : SUN_STANDARD
sun.os.patch.level : 
PID : 2352
java.vm.specification.name : Java Virtual Machine Specification
user.dir : E:\workspace-idea-git\utms-client\utms-c-worker
java.runtime.version : 1.8.0_141-b15
java.awt.graphicsenv : sun.awt.Win32GraphicsEnvironment
java.endorsed.dirs : C:\Program Files\Java\jdk1.8.0_141\jre\lib\endorsed
os.arch : amd64
java.io.tmpdir : C:\Users\kingsomg\AppData\Local\Temp\
line.separator : 

java.vm.specification.vendor : Oracle Corporation
user.variant : 
os.name : Windows 10
sun.jnu.encoding : GBK
spring.beaninfo.ignore : true
java.library.path : C:\Program Files\Java\jdk1.8.0_141\bin;.
java.specification.name : Java Platform API Specification
java.class.version : 52.0
sun.management.compiler : HotSpot 64-Bit Tiered Compilers
os.version : 10.0
user.home : C:\Users\kingsomg
user.timezone : Asia/Shanghai
java.awt.printerjob : sun.awt.windows.WPrinterJob
file.encoding : UTF-8
java.specification.version : 1.8
java.class.path : D:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.1.1\lib\idea_rt.jar;
user.name : kingsomg
java.vm.specification.version : 1.8
sun.java.command : com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit4 com.suning.test.EnvTest
java.home : C:\Program Files\Java\jdk1.8.0_141\jre
sun.arch.data.model : 64
user.language : zh
java.specification.vendor : Oracle Corporation
awt.toolkit : sun.awt.windows.WToolkit
java.vm.info : mixed mode
java.version : 1.8.0_141
java.ext.dirs : C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext;C:\Windows\Sun\Java\lib\ext
sun.boot.class.path : C:\Program Files\Java\jdk1.8.0_141\jre\lib\resources.jar;
java.awt.headless : true
java.vendor : Oracle Corporation
file.separator : \
java.vendor.url.bug : http://bugreport.sun.com/bugreport/
idea.test.cyclic.buffer.size : 1048576
sun.io.unicode.encoding : UnicodeLittle
sun.cpu.endian : little
sun.desktop : windows
sun.cpu.isalist : amd64