public static void main(String[] args) {
try {
File python = new File("scripts/script.py");
System.out.println(python.exists()); // true
Runtime rt = Runtime.getRuntime();
Process pr = rt.exec("python scripts/script.py"); // print('Hello!')
BufferedReader bfr = new BufferedReader(new InputStreamReader(pr.getInputStream()));
String line = "";
while((line = bfr.readLine()) != null)
System.out.println(line);
}
catch(Exception e) {
System.out.println(e.toString());
}
}
// true
// Hello!
// Process finished with exit code 0
放置错误文件没有显示错误的原因是因为此Java代码仅显示输入流（getInputStream()），而不显示错误流（getErrorStream()）：
public static void main(String[] args) {
try {
Runtime rt = Runtime.getRuntime();
Process pr = rt.exec("python scripts/doesnotexist.py");
BufferedReader bfr = new BufferedReader(new InputStreamReader(pr.getErrorStream()));
String line = "";
while((line = bfr.readLine()) != null)
System.out.println(line);
}
catch(Exception e) {
System.out.println(e.toString());
}
}
// python: can't open file 'scripts/doesnotexist.py': [Errno 2] No such file or directory
// Process finished with exit code 0
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