您的位置: 首页 > IT文章 > java 通过图片的Base64字符串判断文件格式 java 通过图片的Base64字符串判断文件格式 分类: IT文章 • 2025-01-05 17:28:49 /** * base64字符串转写为文件 * * @param base64ImgData * @param filePath * @throws IOException */ public static void convertBase64DataToImage(String base64ImgData, String filePath) throws IOException { Files.write(Paths.get(filePath), Base64.getDecoder().decode(base64ImgData), StandardOpenOption.CREATE); } /** * 将文件转写为base64字符串 * * @param filePath * @return * @throws IOException */ public static String convertImageToBase64Data(String filePath) throws IOException { byte[] b = Files.readAllBytes(Paths.get(filePath)); return Base64.getEncoder().encodeToString(b); } /** * 判断图片base64字符串的文件格式 * * @param base64ImgData * @return */ public static String checkImageBase64Format(String base64ImgData) { byte[] b = Base64.getDecoder().decode(base64ImgData); String type = ""; if (0x424D == ((b[0] & 0xff) << 8 | (b[1] & 0xff))) { type = "bmp"; } else if (0x8950 == ((b[0] & 0xff) << 8 | (b[1] & 0xff))) { type = "png"; } else if (0xFFD8 == ((b[0] & 0xff) << 8 | (b[1] & 0xff))) { type = "jpg"; } return type; }
