Java通过InputStream判断word格式)

1. 传入inputStream文件流

2. 读取文件流前八个字节到字节流数组中

byte[] byteArray = new byte[8];
inputStream.read(byteArray, 0, 8);

3. 转为字符串

StringBuilder sb = new StringBuilder();
for (byte b : byteArray) {sb.append(String.format("%02X", b));
}

4. 对比字符串判断文件类型

if (hexString.startsWith("D0CF11E0A1B11AE1")) {return "doc";
} else if (hexString.startsWith("504B030414000600")) {return "docx";
} else {return "unknown";
}

5. 完整代码

/*** 通过流判断word格式* @param inputStream* @return* @throws IOException*/public static String detectFileType(InputStream inputStream) throws IOException {byte[] byteArray = new byte[8];try{inputStream.read(byteArray, 0, 8);String hexString = bytesToHexString(byteArray);if (hexString.startsWith("D0CF11E0A1B11AE1")) {return "doc";} else if (hexString.startsWith("504B030414000600")) {return "docx";} else {return "unknown";}} finally {if (inputStream !=null) {inputStream.close();}}
}private static String bytesToHexString(byte[] byteArray) {StringBuilder sb = new StringBuilder();for (byte b : byteArray) {sb.append(String.format("%02X", b));}return sb.toString();
}