How to execute cmd command in Java class?

Question

I want to call cmd command in java code. I say:

String str ="C:/uploaded_files/111.txt";
Process process = Runtime.getRuntime().exec(new String[]{"cmd.exe", "/c",str});
System.out.println(str);

And dont get 111.txt. Its strange because when this code was in jsp all works fine. What can be wrong?

• Gustav Grusell: What outcome would you expect from running the program, and what do you actually get?
• Juvanis: it might be related with file writing permissions.
• Andrew Thompson: Follow the same advice I gave in comment to this answer.
• Kliver Max: @Gustav Grusell Hmm i want to get 111.txt in C:/uploaded_files folder. But folder still empty.
• Noctua: Well he most likely got just the String printed. He never asked for the process output.

Answer 1

what's the problem with this code. It's perfectly working. opens and shows content of the file 111.txt

try {
 String str ="C:/uploaded_files/111.txt";
 Process process = Runtime.getRuntime().exec(new String[]{"cmd.exe", "/c",str});
 System.out.println(str);
 } catch (Exception ex) {}

please check whether the path is correct and whether the directories and files are not missed or spelled

Answer 2

I hope It is not cmd.exe Please try this:

String[] command = new String[3];
command[0] = "cmd";
command[1] = "/c";
command[2] = "C:/uploaded_files/111.txt";
Process p = Runtime.getRuntime().exec (command);

• Kliver Max: What you mean I hope It is not cmd.exe?

Answer 3

If you want to open the file in notepad try this.

String file = "C:/uploaded_files/111.txt";
Runtime.getRuntime().exec("cmd", "/c", "notepad.exe", file);

Hope it's the one you want.