可能重复:
系统属性和环境变量有什么区别一个>
System.getenv() & 有什么区别?System.getProperty()?
What is the difference between System.getenv() & System.getProperty()?
当我们使用 Processbuilder 运行任何命令时,我们可以设置环境变量,即:
When we run any command using Processbuilder, we can set the environment variables ie:
String[] vCmd = { System.getenv("ANT_HOME") + "/bin/ant", "-f",
ANT_BUILD_FILE, TARGET };
ProcessBuilder pb = new ProcessBuilder(vCmd);
Map<String, String> env = pb.environment();
env.put("CLASSPATH",
antHome+"/lib/ant.jar:"
+ antHome+"/lib/ant-launcher.jar:"
+ antHome+"/lib/ant-nodeps.jar:"
);
try{
Process process = pb.start();
InputStream is = process.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line;
while ((line = br.readLine()) != null) {
System.out.println(line);
}
pb.wait();
}
catch(Exception e)
System.out.println(e.getMessage());
}
如果我在这个方法之前使用 System.setProperties() 设置了一些属性,它是否可用于由 ProcessBuilder 启动的这个进程?
If I set some properties using System.setProperties() before this method , is it available to this process started by ProcessBuilder?
System.getenv
得到一个环境变量.System.getProperty
获取 Java 属性.环境变量在操作系统级别指定.Java 属性是通过将 -D
选项传递给 JVM 来指定的(并且可以通过编程方式设置).
System.getenv
gets an environment variable. System.getProperty
gets a Java property. Environment variables are specified at the OS level. Java properties are specified by passing the -D
option to the JVM (and can be set programmatically).
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