Java BufferedInputStream Copy copyFile(File from, File to)

Description

copy File

License

Apache License

Declaration

public static void copyFile(File from, File to) throws IOException 

Method Source Code

//package com.java2s;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class Main {
    public static void copyFile(File from, File to) throws IOException {
        InputStream in = null;//from  w  w w .  j av  a2 s . c om
        OutputStream out = null;

        try {
            in = new FileInputStream(from);
        } catch (IOException ex) {
            throw new IOException(
                    "Utilities.copyFile: opening input stream '" + from.getPath() + "', " + ex.getMessage());
        }

        try {
            out = new FileOutputStream(to);
        } catch (Exception ex) {
            try {
                in.close();
            } catch (IOException ex1) {
            }
            throw new IOException(
                    "Utilities.copyFile: opening output stream '" + to.getPath() + "', " + ex.getMessage());
        }

        copyInputToOutput(in, out, from.length());
    }

    /**
     * Utility method to copy an input stream to an output stream.
     * Wraps both streams in buffers. Ensures right numbers of bytes copied.
     */
    public static void copyInputToOutput(InputStream input, OutputStream output, long byteCount)
            throws IOException {
        int bytes;
        long length;

        BufferedInputStream in = new BufferedInputStream(input);
        BufferedOutputStream out = new BufferedOutputStream(output);

        byte[] buffer;
        buffer = new byte[8192];

        for (length = byteCount; length > 0;) {
            bytes = (int) (length > 8192 ? 8192 : length);

            try {
                bytes = in.read(buffer, 0, bytes);
            } catch (IOException ex) {
                try {
                    in.close();
                    out.close();
                } catch (IOException ex1) {
                }
                throw new IOException("Reading input stream, " + ex.getMessage());
            }

            if (bytes < 0)
                break;

            length -= bytes;

            try {
                out.write(buffer, 0, bytes);
            } catch (IOException ex) {
                try {
                    in.close();
                    out.close();
                } catch (IOException ex1) {
                }
                throw new IOException("Writing output stream, " + ex.getMessage());
            }
        }

        try {
            in.close();
            out.close();
        } catch (IOException ex) {
            throw new IOException("Closing file streams, " + ex.getMessage());
        }
    }

    public static void copyInputToOutput(InputStream input, OutputStream output) throws IOException {
        BufferedInputStream in = new BufferedInputStream(input);
        BufferedOutputStream out = new BufferedOutputStream(output);
        byte buffer[] = new byte[8192];
        for (int count = 0; count != -1;) {
            count = in.read(buffer, 0, 8192);
            if (count != -1)
                out.write(buffer, 0, count);
        }

        try {
            in.close();
            out.close();
        } catch (IOException ex) {
            throw new IOException("Closing file streams, " + ex.getMessage());
        }
    }
}

Related

1. copyFile(File file, File ziel)
2. copyFile(File from, File to)
3. copyFile(File from, File to)
4. copyFile(File from, File to)
5. copyFile(File fromFile, File toFile)
6. copyFile(File fSrcFile, File fDestFile)
7. copyFile(File in, File out)
8. copyFile(File in, File out)