如何使用 java 代码与系统 cmd 行交互

Question

I'm trying to create a Java code that creates a nifi customized processor ! so in order to do that I need to use windows cmd windows and launch mvn archetype:generate then choose the modele nifi by typing nifi then choose the project by typing 1 the I need to write the groupeId, the artifact...

I need to do all that automatically by using a java code: I tryed this code:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;

public class CmdTest {
    public static void main(String[]args) throws IOException {
        String line;
        OutputStream stdin = null;
        InputStream stderr = null;
        InputStream stdout = null;

          // launch EXE and grab stdin/stdout and stderr
        ProcessBuilder builder = new ProcessBuilder(
                "cmd.exe", "/c", "cd \"C:\\users\\eya\\desktop\\javaprocessor\" && mvn archetype:generate");
            builder.redirectErrorStream(true);
            Process process = builder.start();
          stdin = process.getOutputStream ();
          stderr = process.getErrorStream ();
          stdout = process.getInputStream ();

          // "write" the parms into stdin
          line = "nifi" + "\n";
          stdin.write(line.getBytes() );
          stdin.flush();

          line = "1" + "\n";
          stdin.write(line.getBytes() );
          stdin.flush();

          line = "33" + "\n";
          stdin.write(line.getBytes() );
          stdin.flush();

          line = "javaproceSSor" + "\n";
          stdin.write(line.getBytes() );
          stdin.flush();

          line = "javaprocessor" + "\n";
          stdin.write(line.getBytes() );
          stdin.flush();

          line = "" + "\n";
          stdin.write(line.getBytes() );
          stdin.flush();

          line = "javapro" + "\n";
          stdin.write(line.getBytes() );
          stdin.flush();

          line = "" + "\n";
          stdin.write(line.getBytes() );
          stdin.flush();

          line = "y" + "\n";
          stdin.write(line.getBytes() );
          stdin.flush();

          stdin.close();

          // clean up if any output in stdout
          BufferedReader brCleanUp =
            new BufferedReader (new InputStreamReader (stdout));
          while ((line = brCleanUp.readLine ()) != null) {

              System.out.println ("[Stdout] " + line);
          }
          brCleanUp.close();

          // clean up if any output in stderr
          brCleanUp =
            new BufferedReader (new InputStreamReader (stderr));
          while ((line = brCleanUp.readLine ()) != null) {
            System.out.println ("[Stderr] " + line);
          }
          brCleanUp.close();
    }
}

but it only read "nifi" the others no: and here is the result :

    [Stdout] 2679: remote -> us.fatehi:schemacrawler-archetype-plugin-command (-)
[Stdout] 2680: remote -> us.fatehi:schemacrawler-archetype-plugin-dbconnector (-)
[Stdout] 2681: remote -> us.fatehi:schemacrawler-archetype-plugin-lint (-)
[Stdout] 2682: remote -> ws.osiris:osiris-archetype (Maven Archetype for Osiris)
[Stdout] 2683: remote -> xyz.luan.generator:xyz-gae-generator (-)
[Stdout] 2684: remote -> xyz.luan.generator:xyz-generator (-)
[Stdout] 2685: remote -> za.co.absa.hyperdrive:component-archetype (-)
[Stdout] Choose a number or apply filter (format: [groupId:]artifactId, case sensitive contains): 1589: Choose org.apache.maven.archetypes:maven-archetype-quickstart version: 
[Stdout] 1: 1.0-alpha-1
[Stdout] 2: 1.0-alpha-2
[Stdout] 3: 1.0-alpha-3
[Stdout] 4: 1.0-alpha-4
[Stdout] 5: 1.0
[Stdout] 6: 1.1
[Stdout] 7: 1.3
[Stdout] 8: 1.4
[Stdout] Choose a number: 8: Define value for property 'groupId': [INFO] ------------------------------------------------------------------------
[Stdout] [INFO] BUILD FAILURE
[Stdout] [INFO] ------------------------------------------------------------------------
[Stdout] [INFO] Total time:  12.592 s
[Stdout] [INFO] Finished at: 2020-04-12T21:13:20+01:00
[Stdout] [INFO] ------------------------------------------------------------------------
[Stdout] [ERROR] Failed to execute goal org.apache.maven.plugins:maven-archetype-plugin:3.1.2:generate (default-cli) on project standalone-pom: null: MojoFailureException: NullPointerException -> [Help 1]
[Stdout] [ERROR] 
[Stdout] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[Stdout] [ERROR] Re-run Maven using the -X switch to enable full debug logging.
[Stdout] [ERROR] 
[Stdout] [ERROR] For more information about the errors and possible solutions, please read the following articles:
[Stdout] [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

if there is any way to generate mvn projects automatically then you are very welcome to help

EDIT: I tried this solution but I didn't know how to configure it

Answer 1

Just don't do that. The mvn command could accept all required arguments in command line so there are no interactive actions required. See the documentation on the plugin and supply parameters accordingly into single command. See http://maven.apache.org/archetype/maven-archetype-plugin/generate-mojo.html There is an example here: Specify archetype for archetype:generate on command line