Java - IO流 案例之递归复制文件及文件夹

// 这个是个入口文件
package com.fmg.CopyHomework;

import java.io.File;

public class Copy {
    public static void main(String[] args) {
        File copyFrom = new File("E:\\JAVA");
        String copyFromStr = copyFrom.getPath();  // E:\JAVA
        File copyTo = new File("E:\\test");
        String copyToStr = copyTo.getPath();  // E:\test
        // 判断是否存在
        if (!copyTo.exists()) {
            copyTo.mkdir();
        }
        // 开始复制
        beginCopy(copyFromStr, copyToStr);
    }

    // 参数 复制的原路径, 复制的目标路径
    public static void beginCopy(String from, String to) {
        File fromFile = new File(from);
        // 得到由名字组成的字符串数组
        String[] fileList = fromFile.list();
        for (int i = 0; i < fileList.length; i++) {
            File tempFile = new File(from + "\\" + fileList[i]);
            if (tempFile.isFile()) {
                // 是一个文件,直接复制
                FileReadTool frt = new FileReadTool();
                byte[] bytes = frt.read(tempFile.getPath());
                FileWriterTool fwt = new FileWriterTool();
                fwt.writer(bytes, to + "\\" + fileList[i], false);
            } else {
                // 是一个文件夹, 调用递归 复制
                // 1. 判断文件夹是否存在 如果不存在就创建一个文件夹
                File copyTo = new File(to + "\\" + fileList[i]);
                if (!copyTo.exists()) {
                    copyTo.mkdir();
                }
                // 2. 获取需要复制的根路径
                File copyFrom = new File(from + "\\" + fileList[i]);
                String copyFromStr = copyFrom.getPath();
                // 3. 获取复制到的根路径
                String copyToStr = copyTo.getPath();
                // 4. 调用递归 开始复制
                beginCopy(copyFromStr, copyToStr);
            }
        }
    }
}

package com.fmg.CopyHomework;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class FileReadTool {
    public byte[] read(String road) {
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(road);
            byte[] bytes = new byte[fis.available()];
            fis.read(bytes);
            fis.close();
            return bytes;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
        return new byte[1];
    }
}

package com.fmg.CopyHomework;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * 接收三个参数
 * 1. 要输出的字节流
 * 2. 输出的路径
 * 3. 是否使用追加输出
 */
public class FileWriterTool {
    public void writer (byte[] bytes, String road, boolean boo){
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(road, boo);
            try {
                fos.write(bytes);
                fos.flush();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}