how can I append two files

[Dhan Priyan]

hai
any one tell me how can i append two files in java.

but these are the steps to be done:

note: directory1 & directory2 contains same files mostly

1- read the file1 from the directory1 // it is fine for me
2- read the file2 from the directory2 // it is fine for me

3- later i need to append file2 contents to the end of the file 1. // in this part i am lost with code.

thanks
Priyan

[Jeanne Boyarsky]

Priyan,
Do you know how to write to a file? It's basically the same code except you pass a different boolean value for append when you create the writer.

[Dhan Priyan]

thanks for the kind reply.
i was playing with this code, but i could not understand where to give the file names.
it might help me to link the directory part with this code later.

  
import java.io.*;
import java.io.FileInputStream;

public class CopyFile{
	private static void copyfile(String srFile, String dtFile){
		try{
			File f1 = new File(srFile);
			File f2 = new File(dtFile);
			InputStream in = new FileInputStream(f1);
			
			//For Append the file.
			OutputStream out = new FileOutputStream(f2,true);

			byte[] buf = new byte[1024];
			int len;
			while ((len = in.read(buf)) > 0){
				out.write(buf, 0, len);
			}
			in.close();
			out.close();
			System.out.println("File copied.");
		}
		catch(FileNotFoundException ex){
			System.out.println(ex.getMessage() + " in the specified directory.");
			System.exit(0);
		}
		catch(IOException e){
			System.out.println(e.getMessage());			
		}
	}
	public static void main(String[] args){
		switch(args.length){
			case 0: System.out.println("File has not mentioned.");
					System.exit(0);
			case 1: System.out.println("Destination file has not mentioned.");
					System.exit(0);
			case 2: copyfile(args[0],args[1]);
					System.exit(0);
			default : System.out.println("Multiple files are not allow.");
					  System.exit(0);
		}
	}
}