How to get processbuilder command before execution

Question

I want to know the command that will be executed before it happens.

      String cmd[] = {"curl",
            "-X",
            "POST",
            "https://api.renam.cl/medicion/insert?access-token={Yoq3UGQqDKP4D1L3Y6xIYp-Lb6fyvavpF3Lm-8cD}",
            "-H",
            "content-type: application/json",
            "-d",
            json.toString()};

        ProcessBuilder pb = new ProcessBuilder(cmd);

        Log.debug("COMANDO.TOSTRING " + pb.command().toString());

        Process p = pb.start();

        Log.debug(p.getOutputStream().toString());

        p.waitFor();

        BufferedReader reader
                = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String readline;

        while ((readline = reader.readLine()) != null) {
            Log.debug(readline);
        }

With the readline I have the server answer output but I don't know hot to get the curl command I have exectuted with the processbuilder.

EDIT 1:

I just need to send this command by using the linux console:

curl -X POST 'https://api.com/data/insert?access-token=Yoq3UGQqDKP4D1L3Y6xIYp-Lb6fyvavpF3Lm-8cD' -H 'content-type: application/json' -d '{ "pm25":2, "timestamp":1495077872, "dispositivo_mac": "12:34:56:78:90:12" }'

Basically I need to print the cmd array processed by the ProcessBuilder object to see it before the star method execution.

System.out.println(Arrays.toString(cmd)) .. that'll tell you what the command is you're about to run. — FreudianSlip, May 18 '17 at 07:20
That command prints the same as pb.command().toString() which is just the string array elements separated by commas — Juan Enrique Riquelme, May 18 '17 at 07:26
No need to use curl this way - you can easily do a POST with e.g. Jersey without using an external process. — Gyro Gearless, May 18 '17 at 07:27
The corresponding code is in `ProcessImpl.createCommandLine`. Sadly, it's private. It might be possible to either copy the corresponding code, or add a breakpoint and debug. — Eric Duminil, Oct 16 '19 at 11:53

score 2 · Answer 1 · answered Feb 25 '22 at 20:35

2

I had success with this code:

ProcessBuilder pb = new ProcessBuilder(command);    
logger.debug(String.join(" ",pb.command().toArray(new String[0])));

answered Feb 25 '22 at 20:35

A.Sol

41
5

BullyWiiPlaza · Answer 2 · 2020-10-21T09:10:18.700

Here is code for printing the runnable command:

private String getRunnableCommand(ProcessBuilder processBuilder)
{
    List<String> commandsList = processBuilder.command();
    StringBuilder runnableCommandBuilder = new StringBuilder();
    int commandIndex = 0;
    for (String command : commandsList)
    {
        if (command.contains(" "))
        {
            runnableCommandBuilder.append("\"");
        }
        runnableCommandBuilder.append(command);

        if (command.contains(" "))
        {
            runnableCommandBuilder.append("\"");
        }

        if (commandIndex != commandsList.size() - 1)
        {
            runnableCommandBuilder.append(" ");
        }

        commandIndex++;
    }
    return runnableCommandBuilder.toString();
}

It will surround arguments containing spaces properly with quotation marks.

How to get processbuilder command before execution

2 Answers2

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