取得所有的环境变量
public class GetEnvAndProp {
public static void main(String[] args) {
Map<String, String> getenv = System.getenv();
Set<String> keySet = getenv.keySet();
for (String string : keySet) {
System.out.println(string+ "\t"+getenv.get(string));
}
}
}输出：
| USERDOMAIN_ROAMINGPROFILE DESKTOP-AATAC0K LOCALAPPDATA C:\Users\jjcc\AppData\Local PROCESSOR_LEVEL 6 USERDOMAIN DESKTOP-AATAC0K FPS_BROWSER_APP_PROFILE_STRING Internet Explorer LOGONSERVER \\DESKTOP-AATAC0K SESSIONNAME Console ALLUSERSPROFILE C:\ProgramData PROCESSOR_ARCHITECTURE AMD64 PSModulePath C:\Program Files\WindowsPowerShell\Modules;C:\WINDOWS\system32\WindowsPowerShell\v1.0\Modules SystemDrive C: OneDrive C:\Users\jjcc\OneDrive =C: C:\ APPDATA C:\Users\jjcc\AppData\Roaming USERNAME jjcc ProgramFiles(x86) C:\Program Files (x86) VBOX_MSI_INSTALL_PATH C:\Program Files\Oracle\VirtualBox\ CommonProgramFiles C:\Program Files\Common Files Path C:/Program Files/Java/jre1.8.0_152/bin/server;C:/Program Files/Java/jre1.8.0_152/bin;C:/Program Files/Java/jre1.8.0_152/lib/amd64;C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Users\jjcc\AppData\Local\Microsoft\WindowsApps;;F:\MySoft\eclipse; FPS_BROWSER_USER_PROFILE_STRING Default PATHEXT .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC OS Windows_NT COMPUTERNAME DESKTOP-AATAC0K PROCESSOR_REVISION 5e03 CommonProgramW6432 C:\Program Files\Common Files ComSpec C:\WINDOWS\system32\cmd.exe ProgramData C:\ProgramData ProgramW6432 C:\Program Files HOMEPATH \Users\jjcc SystemRoot C:\WINDOWS TEMP C:\Users\jjcc\AppData\Local\Temp HOMEDRIVE C: PROCESSOR_IDENTIFIER Intel64 Family 6 Model 94 Stepping 3, GenuineIntel USERPROFILE C:\Users\jjcc TMP C:\Users\jjcc\AppData\Local\Temp CommonProgramFiles(x86) C:\Program Files (x86)\Common Files ProgramFiles C:\Program Files PUBLIC C:\Users\Public NUMBER_OF_PROCESSORS 4 windir C:\WINDOWS =:: ::\ |
备注：在windows控制台下可以使用 SET 命令查看和修改环境变量
可以参考:https://www.cnblogs.com/saptechnique/archive/2013/02/17/2914222.html
取得所有的系统属性
public class GetEnvAndProp {
public static void main(String[] args) {
Properties properties = System.getProperties();
properties.list(System.out);
}
}输出：
| -- listing properties -- java.runtime.name=Java(TM) SE Runtime Environment sun.boot.library.path=C:\Program Files\Java\jdk1.8.0_152\jr... java.vm.version=25.152-b16 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.script= user.country=CN sun.java.launcher=SUN_STANDARD sun.os.patch.level= java.vm.specification.name=Java Virtual Machine Specification user.dir=F:\MyCache\eclipse\w1\MyTest java.runtime.version=1.8.0_152-b16 java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment java.endorsed.dirs=C:\Program Files\Java\jdk1.8.0_152\jr... os.arch=amd64 java.io.tmpdir=C:\Users\jjcc\AppData\Local\Temp\ line.separator= java.vm.specification.vendor=Oracle Corporation |