java 递归复制文件夹和文件

公司的电脑是有安全检查的，每次复制一个文件到U盘中都要扫描半天，特别的慢，为了避开电脑的扫描，
想到了java中的io流，写的一个使用递归的方式复制文件夹的demo。保存到博客中，跟大家分享一下，
同时也可以方便后面自己查看。

1.先看看复制文件

①使用基本字节流

public void copyFile(String srcPath, String desPath) {
        BufferedInputStream bufferedInputStream = null;
        BufferedOutputStream bufferedOutputStream = null;
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            inputStream = new FileInputStream(srcPath);
            outputStream = new FileOutputStream(desPath);
            byte[] bytes = new byte[1024];
            int len = 0;
            while ((len = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
        }catch(Exception e){
            e.printStackTrace();
            System.out.println(">>>>>异常<<<<<");
        }finally {
            if(inputStream!=null){
                try {
                    inputStream.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
            if(outputStream!=null){
                try {
                    outputStream.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        }
    }

②使用字节缓冲流复制文件

public void copyFile2(String srcPath, String desPath) {
        BufferedInputStream bufferedInputStream = null;
        BufferedOutputStream bufferedOutputStream = null;

        try {
            bufferedInputStream = new BufferedInputStream(new FileInputStream(srcPath));
            bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(desPath));
            byte[] bytes = new byte[1024];
            int len = 0;

            while ((len = bufferedInputStream.read(bytes)) != -1) {
                bufferedOutputStream.write(bytes,0,len);
                bufferedOutputStream.flush();
            }
        }catch(Exception e){
            e.printStackTrace();
            System.out.println(">>>>>异常<<<<<");
        }finally {
            if(bufferedInputStream!=null){
                try {
                    bufferedInputStream.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
            if(bufferedOutputStream!=null){
                try {
                    bufferedOutputStream.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        }
    }

2.下面是完整的代码

import java.io.*;

/**
 * @author ooyhao
 * //递归复制文件及文件夹
 */
public class Test {


    @org.junit.Test
    public void test(){
        String srcPath = "G:\\面试资料";
        String desPath = "G:\\copyFile";
        list(srcPath,desPath);

    }

    public void list(String srcPath, String descPath){
        File srcFile = new File(srcPath);
        descPath = descPath + File.separator+srcFile.getName();
        System.out.println("srcPath:"+srcPath);
        System.out.println("descPath:"+descPath);
        //首先判断源目录是否为一个文件夹
        if(srcFile.isDirectory()){
            //表示当前目录是一个文件夹
            //获得当前目录下的所有file对象
            File filePath = new File(descPath);
            filePath.mkdirs();
            File[] files = srcFile.listFiles();
            for(File file : files){
                list(file.getAbsolutePath(),filePath.getAbsolutePath());
            }
        }else{
            //表示当前目录是一个文件
            copyFile2(srcPath,descPath);
        }

    }

    // 使用基本字节流进行复制
    public void copyFile(String srcPath, String desPath) {
        BufferedInputStream bufferedInputStream = null;
        BufferedOutputStream bufferedOutputStream = null;
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            inputStream = new FileInputStream(srcPath);
            outputStream = new FileOutputStream(desPath);
            byte[] bytes = new byte[1024];
            int len = 0;
            while ((len = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
        }catch(Exception e){
            e.printStackTrace();
            System.out.println(">>>>>异常<<<<<");
        }finally {
            if(inputStream!=null){
                try {
                    inputStream.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
            if(outputStream!=null){
                try {
                    outputStream.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        }
    }

    // 使用字节缓冲流复制文件
    public void copyFile2(String srcPath, String desPath) {
        BufferedInputStream bufferedInputStream = null;
        BufferedOutputStream bufferedOutputStream = null;

        try {
            bufferedInputStream = new BufferedInputStream(new FileInputStream(srcPath));
            bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(desPath));
            byte[] bytes = new byte[1024];
            int len = 0;

            while ((len = bufferedInputStream.read(bytes)) != -1) {
                bufferedOutputStream.write(bytes,0,len);
                bufferedOutputStream.flush();
            }
        }catch(Exception e){
            e.printStackTrace();
            System.out.println(">>>>>异常<<<<<");
        }finally {
            if(bufferedInputStream!=null){
                try {
                    bufferedInputStream.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
            if(bufferedOutputStream!=null){
                try {
                    bufferedOutputStream.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        }
    }
}