Java Examples - Copy a File

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Problem Description:

How to copy one file into another file?

Solution:

This example shows how to copy contents of one file into another file using read & write methods of BufferedWriter class.

import java.io.*;

public class Main {
   public static void main(String[] args) 
   throws Exception {
      BufferedWriter out1 = new BufferedWriter
      (new FileWriter("srcfile"));
      out1.write("string to be copied\n");
      out1.close();
      InputStream in = new FileInputStream
      (new File("srcfile"));
      OutputStream out = new FileOutputStream
      (new File("destnfile"));
      byte[] buf = new byte[1024];
      int len;
      while ((len = in.read(buf)) > 0) {
         out.write(buf, 0, len);
      }
      in.close();
      out.close();
      BufferedReader in1 = new BufferedReader
      (new FileReader("destnfile"));
      String str;
      while ((str = in1.readLine()) != null) {
         System.out.println(str);
      }
      in.close();
   }
}

Result:

The above code sample will produce the following result.

string to be copied


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