雖然解壓縮adhaar qr代碼示例數據步驟如下 https://uidai.gov.in/images/resource/User_manulal_QR_Code_15032019.pdf，但我得到了java.util.zip.DataFormatException: incorrect header check error while decompressing the byte array// getting aadhaar sample qr code data from// https://uidai.gov.in/images/resource/User_manulal_QR_Code_15032019.pdfString s ="taking here Aadhaar sample qr code data";BigInteger bi = new BigInteger(s, 10); byte[] array = bi.toByteArray(); Inflater decompresser = new Inflater(true);decompresser.setInput(array);ByteArrayOutputStream outputStream = new ByteArrayOutputStream(array.length);byte[] buffer = new byte[1024]; while (!decompresser.finished()) { int count = decompresser.inflate(buffer); outputStream.write(buffer, 0, count); } outputStream.close(); byte[] output = outputStream.toByteArray(); String st = new String(output, 0, 255, "ISO-8859-1");System.out.println("==========="+st);
2 回答
犯罪嫌疑人X
TA貢獻2080條經驗 獲得超4個贊
問題是你使用的是使用Zlib壓縮算法的java的膨脹類。然而，在UIDAI安全QR碼中，正在使用GZip壓縮算法。因此，解壓縮邏輯必須修改如下：
ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
ByteArrayInputStream in = new ByteArrayInputStream(data);
GZIPInputStream gis = new GZIPInputStream(in);
byte[] buffer = new byte[1024];
int len;
while((len = gis.read(buffer)) != -1){ os.write(buffer, 0, len);
}
os.close();
gis.close();
}
catch (IOException e) {
e.printStackTrace();
return null;
}
byte[] output = os.toByteArray();
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