在本机上用IO流实现复制粘贴功能

/**
     * 复制文件夹
     * @param sourcePath
     * @param targetPath
     * @throws IOException
     */
    public void copyFolder(String sourcePath,String targetPath) throws IOException {
        File sourceFile = new File(sourcePath);
        if (!sourceFile.exists()){
            System.out.println("源文件地址不合法");
            return;
        }
        File targetFile = new File(targetPath);
        if (!targetFile.exists()){
            targetFile.mkdirs();
        }

        File[] files = sourceFile.listFiles();
        for (File file : files){
            System.out.println(file.getName());
            if (file.isDirectory()){
                copyFolder(sourcePath+"\\"+file.getName(),targetPath+"\\"+file.getName());
            }
            if (file.isFile()){
                copyDocument(sourcePath+"\\"+file.getName(),targetPath+"\\"+file.getName());
            }
        }
    }

/**
     * 复制文件
     * @param sourcePath
     * @param destPath
     * @throws IOException
     */
    public static void copyDocument(String sourcePath,String destPath) throws IOException {
        // 创建字节缓冲流对象
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(sourcePath));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(destPath));
        // 复制文件
        byte[] buf = new byte[1024];
        int len = 0;
        while((len = bis.read(buf))!=-1){
            bos.write(buf, 0, len);
        }
        bos.close();
        bis.close();
    }

/**
     * 测试代码
     * @throws IOException
     */
    @Test
    public void copyDir() throws IOException {
        String sourcePath = "输入你要复制的文件或文件夹";
        String targetPath = "输入你要复制的文件存放路径";
        copyFolder(sourcePath,targetPath);
    }