IO复制文件

//使用IO流实现文件复制
public static void copy(String by,String to) throws IOException {
    File fileby = new File(by);
    File fileto = new File(to);
    BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(fileby));
    BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(fileto));
    byte[] bytes = new byte[1024];
    int i;
    while ((i = bufferedInputStream.read(bytes)) != -1){
        bufferedOutputStream.write(bytes,0,i);
    }
    bufferedInputStream.close();
    bufferedOutputStream.flush();
    bufferedOutputStream.close();
}

/**
  * 复制文件夹(使用缓冲字节流)
  * @param sourcePath 源文件夹路径
  * @param targetPath 目标文件夹路径
  */
public static void copyFolder(String sourcePath,String targetPath) throws Exception{
    //源文件夹路径
    File sourceFile = new File(sourcePath);
    //目标文件夹路径
    File targetFile = new File(targetPath);

    if(!sourceFile.exists()){
        throw new Exception("文件夹不存在");
    }
    if(!sourceFile.isDirectory()){
        throw new Exception("源文件夹不是目录");
    }
    if(!targetFile.exists()){
        targetFile.mkdirs();
    }
    if(!targetFile.isDirectory()){
        throw new Exception("目标文件夹不是目录");
    }

    File[] files = sourceFile.listFiles();
    if(files == null || files.length == 0){
        return;
    }

    for(File file : files){
        //文件要移动的路径
        String movePath = targetFile+File.separator+file.getName();
        if(file.isDirectory()){
            //如果是目录则递归调用
            copyFolder(file.getAbsolutePath(),movePath);
        }else {
            //如果是文件则复制文件
            BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
            BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(movePath));

            byte[] b = new byte[1024];
            int temp = 0;
            while((temp = in.read(b)) != -1){
                out.write(b,0,temp);
            }
            out.close();
            in.close();
        }
    }
}