从文件夹中复制指定的文件到另一个文件夹

1、以下方法均在A类中

/**
 *localPath：源文件夹的路径
 *filterIrpFileFolderPath：存放复制后的文件的路径
 *fileType：过滤要复制的文件的条件
 */
private void filterIrpFiles(String localPath, String filterIrpFileFolderPath, String fileType)
    {
        if (StringUtil.isEmpty(localPath) || StringUtil.isEmpty(filterIrpFileFolderPath))
        {
            return;
        }
        File folder = new File(localPath);
        if (!folder.exists())
        {
            return;
        }
        File[] files = folder.listFiles();
        if (null == files)
        {
            return;
        }
        // 创建文件夹
        File dir = new File(filterIrpFileFolderPath);
        if (!dir.exists())
        {
            dir.mkdirs();
        }
        for (File file : files)
        {
            if (!file.isFile())
            {
                continue;
            }
            if (!file.getName().trim().contains(fileType))
            {
                continue;
            }
            copyFile(filterIrpFileFolderPath, file);
        }
    }

private void copyFile(String filterIrpFileFolderPath, File file)
    {
        InputStream is = null;
        OutputStream os = null;
        try
        {
            File osFile = new File(filterIrpFileFolderPath + File.separator + file.getName().trim());
            if (!osFile.exists())
            {
                osFile.createNewFile();
            }
            is = new FileInputStream(file);
            os = new FileOutputStream(osFile);
            byte[] flush = new byte[1024];
            int len = -1;

            while((len = is.read(flush)) != -1)
            {
                os.write(flush, 0, len);
            }
　　　　　　　// 刷新缓存
            os.flush();
        }
        catch (IOException e)
        {
            logger.error(e);
        }
        finally
        {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    log.error(e);
                }
            }
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    log.error(e);
                }
            }
        }
    }

TEST：

public static void main(String[] args)
{
    A a= new A();
    a.filterIrpFiles("D:\\AX_EDI\\HaviToGodiva", "D:\\EC_EDI\\HaviToGodiva", "DC");
}