文件夹迁移程序设计

要点

1.递归思想，循环调用迁移方法
2.字符串拼接，对文件夹目录路径进行拼接
3.fileInputStream和fileOutputStream流传输数据的应用

package com.ultraBlast.dao;

import java.io.*;

/**
 * @Auther: UltraBlast
 * @Date : 2021/3/7 - 03 - 07 - 2021 - 17:02
 * @Description : com.ultraBlast.dao
 * @version: 1.0
 */
public class CopyTest {

    public static void main(String[] args) {
        File srcFile = new File("path");
        File destFile = new File("destPath");
        copyDir(srcFile, destFile);
    }

    private static void copyDir(File srcFile, File destFile) {
        if (srcFile.isFile()) {
            FileInputStream fis = null;
            FileOutputStream fos = null;
            try {
                fis = new FileInputStream(srcFile);
                String path = (destFile.getAbsolutePath().endsWith("\\") ? destFile.getAbsolutePath() : destFile.getAbsolutePath() + "\\") + srcFile.getAbsolutePath().substring(3);
                fos = new FileOutputStream(path);
                byte[] readArr = new byte[1024 * 1024];
                int readIndex = 0;
                //readIndex = fis.read(readArr);
                while ((readIndex = fis.read(readArr)) != -1) {
                    fos.write(readArr, 0, readIndex);
                }
                fos.flush();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        } else {
            return;
        }
        File[] files = srcFile.listFiles();
        for (File file : files) {
            if (file.isDirectory()) {
                String srcDir = file.getAbsolutePath();
                String destDir = (destFile.getAbsolutePath().endsWith("\\") ? destFile.getAbsolutePath() : destFile.getAbsolutePath() + "\\") + srcDir.substring(3);
                File newFile = new File(destDir);
                if (!newFile.exists()) {
                    newFile.mkdirs();
                }
            }
            copyDir(file, destFile);

        }
    }
}