Execute several line commands in a Java Programm

Question

I need to execute some line command in my java program. For example, I want to go to a directory and then create a folder in it like this:

cd C:\\Users\\qi11091\\Documents\\TITAN_Command_Line\\FirstTest
mkdir toto

My probem is that I can do the first command, it works but I don't know how to do the second command in my Program.

Here is my code

public void TtcnToC(String path){
    System.out.println("Début du programme");
    try{
        System.out.println("Path target verification: "+path);

        String[] mkdir = {"cmd.exe", "/c","cd C:\\Users\\qi11091\\Documents\\TITAN_Command_Line\\FirstTest", "mkdir titi"};
        String[] mkdir1 = {"cmd.exe", "/c","cd "+ path};
        Runtime runtime = Runtime.getRuntime();
        Process process = runtime.exec(mkdir1);

        //Process process1 = runtime.exec(mkdir1);
        //Process process2 = runtime.exec(mkdir2);

        BufferedReader output = getOutput(process);
        BufferedReader error = getError(process);
        String ligne = "";

        while ((ligne = output.readLine()) != null) {
            System.out.println(ligne);
        }

        while ((ligne = error.readLine()) != null) {
            System.out.println(ligne);
        }

        System.out.println("in the shell");
        process.waitFor();
    }

what exactly are you using Process and runtime for all this? The File class has everything you need to create new folders and such. — Stultuske, Apr 15 '15 at 08:37
It is just an example so I can understand how to work with command line on a Java programm. I just need to know how to write several line commands in a java programm, because I will need it to write others commands than creating a folder — Anatch, Apr 15 '15 at 08:40

Ceiling Gecko · Accepted Answer · 2015-04-15T09:09:15.443

To execute multiple commands in succession you can execute them in a single command by using the syntax that command line uses to execute multiple commands in the same line.

You can create a private method that concatenates all of these commands into one command that CMD will understand:

private String combineCommands(String[] commands){
    String result = "";
    for(String command: commands){
        result = result + command + " && ";
    }
    if(result.length() > 0){
        result = result.subString(0,result.length()-3); // We remove the last && here.
    }
    return result;
}

So you pass it a String array, for example:

String[] myCommands = {"cd C:\\Users\\qi11091\\Documents\\TITAN_Command_Line\\FirstTest", "mkdir titi"};

Then you can just simply call your execution as you did before:

String[] mkdir1 = {"cmd.exe", "/c",combineCommands(myCommands)};
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec(mkdir1);

This way you don't have to make a call to Runtime for every command you wish to execute.

Saurabh Jhunjhunwala · Answer 2 · 2015-04-15T09:00:32.377

Just for a sample, you can have a look at the below code,

    try { 

        String[] command = new String[2];
        command[0]="cmd /c dir";
        command[1]="cmd /c dir/w";

        Process p;

        for (int i = 0; i < command.length; i++) {
            String cmd = command[i];
            p=Runtime.getRuntime().exec(cmd); 
            p.waitFor();    

            BufferedReader reader=new BufferedReader(new InputStreamReader(p.getInputStream())); 
            String line=reader.readLine(); 
            while(line!=null) 
            { 
                System.out.println(line); 
                line=reader.readLine(); 
            } 
        }

    } catch(IOException e1) {
        e1.printStackTrace();
    } 
    catch(InterruptedException e2) {
        e2.printStackTrace();
    } 

    System.out.println("Done"); 
}

Execute several line commands in a Java Programm

2 Answers2

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