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Tip of the Day
Language: Java
Expertise: Intermediate
Oct 11, 2002

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Copy Data from One File to Another


This wrapper class "FileCopier" copies data from one file to another. This class uses another class: "StreamCopier".
 
 /**
 * Class: FileCopier
 * Author: Vivek Bagade
 * Date: 8/31/2001
 * Description: Copies from one file to another file
 */
import java.io.*;

/**
 */
public class FileCopier
{
	public static void main(String[] args)
	{

	}
	public static void copy(String inFile, String outFile)
		throws IOException {

		FileInputStream fin = null;
		FileOutputStream fout = null;

		try {
			fin = new FileInputStream(inFile);
			fout = new FileOutputStream(outFile);
			StreamCopier.copy(fin, fout);
		}
		finally {
			try {
				if(fin != null) fin.close();
			}
			catch(IOException e) {
			}
			try {
				if(fin != null) fin.close();
			}
			catch(IOException e) {
			}
		}
	}
	public static void copy(File inFile, File outFile)
		throws IOException {
		copy(inFile.getAbsolutePath(), 
outFile.getAbsolutePath());
	}

	public static int createFileSafely(File f)
	{
		try {
			if(f.exists()) {
				return 0;
			}
			FileOutputStream fout = 
new FileOutputStream(f);
			fout.close();
			return 1;
		}
		catch(Exception e)
		{
			e.printStackTrace();
			return 2;
		}
	}

}

/**
 * Class: StreamCopier
 * Author: Vivek Bagade
 * Date: 8/31/2001
 * Description: Copies from input stream to outputstream
 */
import java.io.*;

/**
 */
public class StreamCopier
{
	public static void main(String[] args)
	{

	}

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

		synchronized(in) {
			synchronized(out) {
				byte[] buffer = new byte[256];
				while(true) {
					int bytesRead = 
in.read(buffer);
					if(bytesRead == 
-1) break;
					out.write
(buffer,0,bytesRead);
				}
			}
		}
	}
}
Vivek Bagade
 
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