Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;

public class Main {
    /**
     * Effective way to copy files by file channel.
     * @return Return the number of copied files.
     */
    public static int fileChannelCopy(File[] sources, File[] targets) {
        int result = 0;
        if (sources == null || targets == null) {
            return result;
        }

        FileInputStream fis = null;
        FileOutputStream fos = null;
        FileChannel fc_in = null;
        FileChannel fc_out = null;
        try {
            for (int i = 0, len_s = sources.length, len_t = targets.length; i < len_s && i < len_t; ++i) {
                if (sources[i] == null || targets[i] == null) {
                    continue;
                }

                fis = new FileInputStream(sources[i]);
                fos = new FileOutputStream(targets[i]);
                fc_in = fis.getChannel();
                fc_out = fos.getChannel();
                fc_in.transferTo(0, fc_in.size(), fc_out);

                ++result;
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fc_out != null) {
                try {
                    fc_out.close();
                } catch (IOException e) {
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                }
            }
            if (fc_in != null) {
                try {
                    fc_in.close();
                } catch (IOException e) {
                }
            }
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                }
            }
        }

        return result;
    }

    public static int fileChannelCopy(File source, File target) {
        return fileChannelCopy(new File[] { source }, new File[] { target });
    }
}