Java I/O How to - Copy from InputStream to OutputStream

Question

We would like to know how to copy from InputStream to OutputStream.

Answer

      /*w w w . ja  v a  2  s .  c  o m*/


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

public class MainClass {

  public static void main(String[] args) {
    try {
      copy(System.in, System.out);
    } catch (IOException ex) {
      System.err.println(ex);
    }

  }

  public static void copy(InputStream in, OutputStream out) throws IOException {

    byte[] buffer = new byte[1024];
    while (true) {
      int bytesRead = in.read(buffer);
      if (bytesRead == -1)
        break;
      out.write(buffer, 0, bytesRead);
    }
  }
}

The code above generates the following result.