我这么写不知对不对, 但结果老是nullpublic class ShowENV{
public static void main(String[] args) {
System.out.println(System.getProperty("classpath"));
}
}
public static void main(String[] args) {
System.out.println(System.getProperty("classpath"));
}
}
System.out.println(System.getProperty("java.class.path"));
你可以到jdk的api文档中取得key,大概得如下:
Key Description of Associated Value
java.version Java Runtime Environment version
java.vendor Java Runtime Environment vendor
java.vendor.url Java vendor URL
java.home Java installation directory
java.vm.specification.version Java Virtual Machine specification version
java.vm.specification.vendor Java Virtual Machine specification vendor
java.vm.specification.name Java Virtual Machine specification name
java.vm.version Java Virtual Machine implementation version
java.vm.vendor Java Virtual Machine implementation vendor
java.vm.name Java Virtual Machine implementation name
java.specification.version Java Runtime Environment specification version
java.specification.vendor Java Runtime Environment specification vendor
java.specification.name Java Runtime Environment specification name
java.class.version Java class format version number
java.class.path Java class path
java.ext.dirs Path of extension directory or directories
os.name Operating system name
os.arch Operating system architecture
os.version Operating system version
file.separator File separator ("/" on UNIX)
path.separator Path separator (":" on UNIX)
line.separator Line separator ("\n" on UNIX)
user.name User's account name
user.home User's home directory
user.dir User's current working directory
进行配置。在程序中拿这变量, 并不是要在程序中设置环境变量。 当然, 假如能提供简短代码 就最好了。 谢谢
Process process = null;
Properties envVars = new Properties();
Runtime runtime = Runtime.getRuntime();
String OS = System.getProperty("os.name").toLowerCase();
if (OS.indexOf("windows 9") > -1)
{
process = runtime.exec( "command.com /c set" );
}
else if (OS.indexOf("nt") > -1 || OS.indexOf("windows 2000") > -1)
{
process = runtime.exec( "cmd.exe /c set" );
}
else if (OS.indexOf("unix") > -1)
{
process = runtime.exec( "/bin/env" );
}
BufferedReader br = new BufferedReader ( new InputStreamReader( process.getInputStream() ) );
String line;
while( (line = br.readLine()) != null )
{
int idx = line.indexOf( '=' );
String key = line.substring( 0, idx );
String value = line.substring( idx+1 );
envVars.setProperty( key.toUpperCase(), value );
}
process.destroy ();
return envVars;