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问题:

I am calling java.lang.Runtime.exec(...) but this seems to accept the command lines as an array and I want to use a single string.

How can I do the same using a single string?

回答1:

From the linked Javadocs:

envp - array of strings, each element of which has environment variable settings in the format name=value, or null if the subprocess should inherit the environment of the current process.

So just pass in null for the second parameter, and the environment will be inhereted.

回答2:

If you pass null for the second paramter the current environment will be inherited.

If you want to modify the current environment, you can build it from System.getEnv() like this:

private static String[] getEnv() {
    Map<String, String> env = System.getenv();
    String[] envp = new String[env.size()];
    int i = 0;
    for (Map.Entry<String, String> e : env.entrySet()) {
        envp[i++] = e.getKey() + "=" + e.getValue();
    }
    return envp;
}

Update

You can check your Java path with System.out.println(System.getenv("PATH"));

If path is ok, then try it with

String[] commands = new String[] { "bash", "-c", "python foo/bar.py" };
Runtime.getRuntime().exec(commands, null, new File("/workingDir"));

回答3:

From the documentation:

envp - array of strings, each element of which has environment variable settings in the format name=value, or null if the subprocess should inherit the environment of the current process.

It sounds like you want to pass null for that argument.