关于流的转换

　　/**
     * file文件转byte数组
     * */
public byte[] fileToByte(String filePath){
        byte[] data = null;
        FileInputStream fis = null;
        ByteArrayOutputStream baos = null;
        try {
            fis = new FileInputStream(filePath);
            baos = new ByteArrayOutputStream();
            int len;
            byte[] buffer = new byte[1024];
            while ((len = fis.read(buffer)) != -1) {
                baos.write(buffer, 0, len);
            }
            data = baos.toByteArray();
            fis.close();
            baos.close();
        } catch (Exception e) {
            log.error("FileUpload_fileToByte_error:"+e.toString());
        }
        return data;
    }

　　　/**
     * file文件压缩后转成base64
     * */
    public static String zipByteArrayOutputStream(String filePath) {
        File zip = ZipUtil.zip(filePath);
        if (null == zip){
            throw new BizException(ErrCode.UserEnum.FILE_NOT_EXIST);
        }
        String result = null;
        FileInputStream inputFile = null;
        try {
            inputFile = new FileInputStream(zip);
            byte[] bytes = new byte[(int)zip.length()];
            inputFile.read(bytes);
            result= Base64.getEncoder().encodeToString(bytes);
        }catch (Exception e){
            log.error("YLVirtualAccountRouteServiceImpl_FileUpload 文件压缩转Base64失败:"+e.toString());
            throw new BizException(ErrCode.UserEnum.ZIP_TO_FILE_ERROR);
        }finally {
            try {
                inputFile.close();
            }catch (Exception e){
                log.error("YLVirtualAccountRouteServiceImpl_FileUpload 文件压缩转Base64失败:"+e.toString());
                throw new BizException(ErrCode.UserEnum.ZIP_TO_FILE_ERROR);
            }
        }
        return result;
    }

/** * base64 转成file * */
public static void base64ToFile(String base64,String targetPath,String fileName)throws Exception {
    byte[] decode = Base64.getDecoder().decode(base64);
    FileOutputStream out = new FileOutputStream(targetPath+"/"+fileName);
    out.write(decode);
    out.close();
}