Java复制目录/子目录/文件

 

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.List;

/**
 * 文件拷贝
 * @author lixiaolong
 */
public class FileTransfer {
    
    /**
     * 使用通道的方式进行整个目录/子目录/文件的拷贝
     * @throws IOException
     */
    public void useChannel() throws IOException {
        String driver = "F:\\AgileController";
        String path = "/tomcat/webapps/OPMUI/customize";
        File input = new File(driver + path);
        
        String bakpath = "\\syncbak";
        File bakFile = new File(driver + bakpath);
        if(bakFile.exists())
        {
            deleteFile(bakFile);
        }
        bakFile.mkdirs();
        
        File output = new File(driver + bakpath + path);
        
        if(input.isDirectory()) {
            output.mkdirs();
            
            List<File> allFileList = new ArrayList<File>();
            getAllFiles(input, allFileList);
            for(File f : allFileList) {
                String outputPath = f.getCanonicalPath();
                if(outputPath.startsWith(driver))
                {
                    outputPath = driver + bakpath + outputPath.substring(driver.length(), outputPath.length());
                }
                output = new File(outputPath);
                if(f.isDirectory())
                {
                    output.mkdirs();
                } else {
                    fileCopy(f, output);
                }
            }
        } else {
            fileCopy(input, output);
        }
    }
    
    /**
     * 递归列出所有子目录/文件
     * @param directory
     * @param allFileList
     */
    private void getAllFiles(File directory, List<File> allFileList) {
        File flist[] = directory.listFiles();
        if (flist == null || flist.length == 0) {
            return;
        }
        for (File f : flist) {
            if (f.isDirectory()) {
                //列出所有子文件夹
                allFileList.add(f);
                getAllFiles(f, allFileList);
            } else {
                //列出所有文件
                allFileList.add(f);
            }
        }
    }
    
    /**
     * 使用通道的方式对单个文件进行拷贝
     * @param input
     * @param output
     * @throws IOException
     */
    private void fileCopy(File input, File output) throws IOException {
        if(!input.exists()) {
            return;
        }
        
        if(!output.exists()) {
            output.createNewFile();
        }
        
        FileInputStream fis = new FileInputStream(input);
        FileOutputStream fos = new FileOutputStream(output);
        FileChannel inputChannel = null;
        FileChannel outputChannel = null;
        try {
            inputChannel = fis.getChannel();
            outputChannel = fos.getChannel();
            outputChannel.transferFrom(inputChannel, 0, inputChannel.size());
        } finally {
            inputChannel.close();
            outputChannel.close();
            fis.close();
            fos.close();
        }
    }
    
    /**
     * 级联删除文件
     * @param file
     */
    private void deleteFile(File file)
    {
        if (file.isDirectory())
        {
            File[] files = file.listFiles();
            for (File f : files)
            {
                f.delete();
            }
        }
        file.delete();
    }
    
    public static void main(String[] args) {
        FileTransfer ft = new FileTransfer();
        try {
            ft.useChannel();
        } catch (IOException e) {
            System.out.println(e);
        }
        System.out.println("end");
    }

}