嵌套文件夹复制实现

package com.neusoft.myMaven.example;
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 CopyFile {
    public static final String filePath = System.getProperty("user.dir") + File.separator + "mp3" + File.separator
            + "3";
    public static final String directoryPath = System.getProperty("user.dir") + File.separator + "mp3";
    public static final String copyPath = System.getProperty("user.dir") + File.separator + "mp3" + File.separator
            + "31";
    public static void copy() {
        long start = System.currentTimeMillis();
        FileUtil fUtil = new FileUtil(filePath, copyPath);
        try {
            System.out.println(fUtil.copy() ? "SUCCESS" : "ERROR");
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        long end = System.currentTimeMillis();
        System.out.println("Copy Complete".toUpperCase() + ",USED TIME:" + (end - start));
    }
}
class FileUtil {
    private File srcFile;// 源文件路径
    private File desFile;// 目标文件路径
    public FileUtil(String src, String des) {
        this(new File(src), new File(des));
    }
    public FileUtil(File srcFile, File desFile) {
        this.srcFile = srcFile;
        this.desFile = desFile;
    }
    /*
      @name: 递归搜索文件或者文件夹及子文件夹中的文件
      @msg:
      @param {type}
      @return:
     /
    private void searchFile(File file) throws Exception {
        if (file.isDirectory()) {
            File newFile = new File(file.getPath().replace(this.srcFile.getPath(), this.desFile.getPath()));
            if (!newFile.exists()) {
                newFile.mkdirs();// 保证目标文件的文件夹存在
            }
            File[] results = file.listFiles();
            if (results != null) {
                for (int i = 0; i < results.length; i++) {
                    searchFile(results[i]);// 递归搜索
                }
            }
        } else {
            if (file.isFile()) {
                String newFilePath = file.getPath().replace(this.srcFile.getPath() + File.separator, "");
                File newFile = new File(this.desFile, newFilePath);
                this.copyFile(file, newFile);
            }
        }
    }
    /*
      @name: 复制文件
      @msg:
      @param {type}
      @return:
     /
    private boolean copyFile(File srcFileTmp, File desFileTmp) throws IOException {
        if (!this.desFile.getParentFile().exists()) {
            this.desFile.getParentFile().mkdirs();
        }
        InputStream input = null;
        OutputStream output = null;
        try {
            input = new FileInputStream(srcFileTmp);
            output = new FileOutputStream(desFileTmp);
            // input.transferTo(output);//jdk1.9后提供的方法，简单方便
            // 下面这一部分和上面一句是同样的作用，用于jdk1.9以下
            int len = 0;
            byte[] data = new byte[10240];
            while ((len = input.read(data)) != -1) {
                output.write(data, 0, len);
            }
            // 此快到这里结束
            return true;
        } catch (Exception e) {
            // TODO: handle exception
            throw e;
        } finally {
            // 一定要记得关闭资源
            if (input != null) {
                input.close();
            }
            if (output != null) {
                output.close();
            }
        }
    }
    public boolean copy() throws Exception {
        if (!this.srcFile.exists()) {
            System.out.println("Source file does not exist".toUpperCase());
            return false;
        }
        try {
            this.searchFile(this.srcFile);
            return true;
        } catch (Exception e) {
            // TODO: handle exception
            throw e;
        }
    }
}

CopyFile.copy();