How can I get input from terminal in a container?

[hyb200]

I want to run an interactive Java program in docker and need input from a terminal. How do I do this? The Java code is here:

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String input = in.nextLine(); 
        System.out.println(input); 
    }
}

[white2q]

请问你现在解决这个问题了吗？如何解决的呢？

[YaleXin]

I have a solution, but it's not perfect, just use "echo" command.
I have Main.java to run:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int a = Integer.parseInt(scan.next());
        int b = Integer.parseInt(scan.next());
        System.out.println((a + b));
    }
}

and

private List<ExecuteMessage> runCode(String containerId, String language, List<String> inputList) {
        List<ExecuteMessage> executeMessageArrayList = new ArrayList<>();
        SandboxEntry.DockerInfo dockerInfoByName = sandboxEntry.getDockerInfoByName(language);
        String runCmd = dockerInfoByName.getRun();
        for (String inputStr :
                inputList) {
            String curRunCmd = String.format("echo \"%s\" | %s", inputStr, runCmd);
            ExecuteMessage executeMessage = runCmdWithDocker(containerId, curRunCmd);
            executeMessageArrayList.add(executeMessage);
        }
        return executeMessageArrayList;
    }
.....
....
...
private ExecuteMessage runCmdWithDocker(String containerId, String cmd) {
        String[] userCodeCmd = {"sh", "-c", String.format("%s", cmd)};
        log.info("docker cmd = {}", Arrays.stream(userCodeCmd)
                .collect(Collectors.joining(" ")));
        final boolean[] timeout = {true};
        ExecuteMessage executeMessage = new ExecuteMessage();
        ExecCreateCmdResponse execCreateCmdResponse = dockerClient.execCreateCmd(containerId)
                .withAttachStdout(true)
                .withAttachStderr(true)
                .withAttachStdin(true)
                .withCmd(userCodeCmd)
                .exec();
......
.....
}

finally, terminal will output:

docker cmd = sh -c echo "1 2" | java Main

You can get more detail from my code repository

[YaleXin]

Oh, you can get better solution from here