在 Java 中将数据写入 NFC 智能卡
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【中文标题】在 Java 中将数据写入 NFC 智能卡【英文标题】：Write Data to NFC smartcard in Java 【发布时间】：2020-12-15 17:22:24 【问题描述】：我被要求编写一个简单的程序来使用 NFC 从智能卡 (MIFARE) 读取和写入数据，但我被卡住了。
我必须获得 UID（到目前为止一切顺利），将一些从数据库中获取的数据写入卡的某些块中（没办法）。
我必须使用 Java 和 ACR122 阅读器。我写的代码仍然需要改进和重构，这主要是一个草稿，但我想先以某种方式完成任务，然后修复所有问题。我阅读了我在互联网上可以找到的内容，但我仍然想念一些东西。到目前为止我得到的（主要是把一些代码放在一起）是：
package testnfc;
import javax.smartcardio.*;
import java.util.Arrays;
import java.util.List;
import static testnfc.Helpers.*;
import java.nio.ByteBuffer;
public class TestNFC
`enter code here`public static void main(String[] args) throws CardException
// get and print any card readers (terminals)
TerminalFactory factory = TerminalFactory.getDefault();
List<CardTerminal> terminals=null;
try
terminals = factory.terminals().list();
System.out.println("Terminals: " + terminals);
// work with the first terminal
CardTerminal term = terminals.get(0);
// connect with the card. Throw an exception if a card isn't present
// the * means use any available protocol
try
Card card = term.connect("*");
System.out.println("card: " + card);
//Got the card
CardChannel channel = card.getBasicChannel();
byte[] instruction = hexToBytes("FF CA 00 00 00");
CommandAPDU getUID = new CommandAPDU(instruction);
ResponseAPDU response = channel.transmit(getUID);
String uid = bytesToPrettyHex(response.getData());
String status = bytesToPrettyHex(new byte[] (byte)response.getSW1(), (byte)response.getSW2());
System.out.printf("UID: %s\tResponse: %s\n", uid, status); //Status = 90 -> Success, 63 -> Fail
//Up to this point it works, I can get the terminal and the UID of the card. Now I am trying to write datas in the card
byte[] dati;
dati=new byte[4];
dati[0]=(byte)12;
dati[1]=(byte)12;
dati[2]=(byte)12;
writeData(card, (byte)1, dati);
catch(CardNotPresentException exc)
System.out.println("Card not found!");
catch(CardException ex)
System.out.println("Terminal not found!");
public static void writeData(Card c, byte block, byte[] data)
throws CardException
byte cla = (byte) 0xFF;
byte ins = (byte) 0xD6;
byte p1 = (byte) 0x00;
byte p2 = block;
byte le = 0x10;
byte[] params = new byte[21];
for (int i = 0; i < 21; i++)
params[i] = 0x20;
params[0] = cla;
params[1] = ins;
params[2] = p1;
params[3] = p2;
params[4] = le;
for (int i = 0; i < data.length; i++)
params[5 + i] = data[i];
System.out.println("step1");
CardChannel channel = c.getBasicChannel();
CommandAPDU command = new CommandAPDU(params);
System.out.println("Step2");
ResponseAPDU response = channel.transmit(command);
System.out.println("Step3, response ->"+ response);
validateResponse(response);
System.out.println("Step4");
private static void validateResponse(ResponseAPDU response)
throws CardException
int respSW1=0;
int respSW2=0;
respSW1 = response.getSW1();
respSW2 = response.getSW2();
System.out.println("SW1 ->"+respSW1 + ", SW2 ->"+ respSW2);
if (respSW1 != 144)
throw new CardException("Autentication Problem?");
我得到的输出是
Terminals: [PC/SC terminal ACS ACR122 0]
card: PC/SC card in ACS ACR122 0, protocol T=1, state OK
UID: EA:54:42:AA Response: 90:00
step 1
step2
step3, response ->ResponseAPDU: 2 bytes, SW=6300
SW1 ->99, SW2 ->0
Terminal not found
我可以读取卡的 UID，但我不能写入；卡本身没问题，使用桌面的 NFC 工具我可以访问和写入。我查找了一些文档，但我无法解决问题，如果没有一些示例，我将无法正确学习。我不明白为什么我得到一个 6300 代码：从我发现它的意思是“非易失性内存的状态已更改”，但如果我使用 NFC 工具检查，我找不到任何区别。
我必须更改哪些内容才能从卡中写入和读取？
【问题讨论】：
真的需要知道 NFC 卡的型号 Mifare Classic、Mifare Ultralight、Mifare Desfire 等，因为这些因素会改变要使用的命令。 感谢您的回复@Andrew。我不太清楚，客户给我玩了一些智能卡并告诉我“这些是卡”，没有蚂蚁盒子或蚂蚁其他信息。我想是 Mifare Classic，有什么命令可以找到吗？ 来自 nxp play.google.com/store/apps/… 的 android App TagInfo 或 ios 版本会告诉您型号（IC 类型） 【参考方案1】：根据 NFC 工具，它是 Mifare Classic 1kb
【讨论】：
【参考方案2】：我解决了这个问题。这是我的代码（概念证明，只是为了展示它是如何工作的）
package testnfc;
import javax.smartcardio.*;
import java.util.List;
import java.io.*;
import static testnfc.Helpers.*;
import java.lang.Integer;
import java.nio.charset.StandardCharsets;
public class TestNFC
public static void main(String[] args) throws CardException
// get and print any card readers (terminals)
TerminalFactory factory = TerminalFactory.getDefault();
List<CardTerminal> terminals=null;
try
terminals = factory.terminals().list();
System.out.println("Terminals: " + terminals);
// work with the first terminal
CardTerminal term = terminals.get(0);
// connect with the card. Throw an exception if a card isn't present
// the * means use any available protocol
try
Card card = term.connect("*");
System.out.println("card: " + card);
// Once we have the card, we can open a communication channel for sending commands and getting responses
CardChannel channel = card.getBasicChannel();
byte[] dati;
String valori=[data to be written];
dati=valori.getBytes();
System.out.println("valori ->" + valori + ", dati ->"+dati);
//Not used right now
//loadAuthentication(card);
byte addr = 0x06;
authenticate(card, addr);
writeData(card, addr, dati);
readData(card, addr);
catch(CardNotPresentException exc)
System.out.println("Card not found!");
stampTrace(exc);
catch(CardException ex)
System.out.println("Terminal not found");
stampTrace(ex);
/*
* Prints stack trace (for debug)
*/
public static String stampTrace(Exception ex)
StringWriter errors = new StringWriter();
ex.printStackTrace(new PrintWriter (errors));
String ret=errors.toString();
System.out.println(ret);
return ret;
/*
* Funzioni per convertire in byte, per passare i parametri alle funzionin;
*/
public byte fromIntToByte(int i)
Integer v=i;
byte b=v.byteValue();
return b;
public byte[] fromStringToByte(String s)
byte[] byteArray=s.getBytes();
return byteArray;
public static void authenticate(Card c, byte addr) throws CardException
byte cls = (byte) 0xFF;
byte ins = (byte) 0x86;
byte p1 = (byte) 0x00;
byte p2 = (byte) 0x00;
byte lc = (byte) 0x05;
byte[] params = new byte[] cls, ins, p1, p2, lc, 0x01, 0x00, addr, 0x60, 0x00 ;// 0x60 -> Key A per auth, 0x61 -> key B
CardChannel channel = c.getBasicChannel();
CommandAPDU command = new CommandAPDU(params);
System.out.println("Tryint to authenticate.");
ResponseAPDU response = channel.transmit(command);
validateResponse(response);
System.out.println("Autenticated!");
/*
* Load new auth key in the card. Not used at the moment
*/
public static void loadAuthentication(Card c) throws CardException
byte cla = (byte) 0xFF;
byte ins = (byte) 0x82;
byte p1 = (byte) 0x00;
byte p2 = (byte) 0x01;
byte lc = (byte) 0x06;
byte key = (byte) 0xFF;
byte[] params = new byte[] cla, ins, p1, p2, lc, key, key, key,
key, key, key ;
CardChannel channel = c.getBasicChannel();
CommandAPDU command = new CommandAPDU(params);
ResponseAPDU response = channel.transmit(command);
validateResponse(response);
System.out.println("Auth OK!");
/*
* Reads from card
* @param c card to be read
* @param block block I want to read
*/
public static byte[] readData(Card c, byte block) throws CardException
byte cla = (byte) 0xFF;
byte ins = (byte) 0xB0;
byte p1 = (byte) 0x00;
byte p2 = block;
byte le = (byte) 0x10;
byte[] params = new byte[] cla, ins, p1, p2, le ;
CardChannel channel = c.getBasicChannel();
CommandAPDU command = new CommandAPDU(params);
System.out.println("Trying to read");
ResponseAPDU response = channel.transmit(command);
System.out.println("Read, response ->"+response);
String ret=new String(response.getData(), StandardCharsets.UTF_8);
System.out.println("getData ->"+response.getData()+", string ->"+ret);
validateResponse(response);
return response.getData();
/*
* Writes data into card
* @param c card to be written
* @param block block I want to write in
* @param data what I want to write
*/
public static void writeData(Card c, byte block, byte[] data)
throws CardException
byte cla = (byte) 0xFF;
byte ins = (byte) 0xD6;
byte p1 = (byte) 0x00;
byte p2 = (byte) block;
byte le = 0x10;
byte[] params = new byte[21];
for (int i = 0; i < 21; i++)
params[i] = 0x20;
params[0] = cla;
params[1] = ins;
params[2] = p1;
params[3] = p2;
params[4] = le;
for (int i = 0; i < data.length; i++)
params[5 + i] = data[i];
System.out.println("i ->"+ String.valueOf(i)+", dato ->"+params[5+i]);
CardChannel channel = c.getBasicChannel();
CommandAPDU command = new CommandAPDU(params);
ResponseAPDU response = channel.transmit(command);
System.out.println("step3, response ->"+ response);
validateResponse(response);
System.out.println("step4");
/*
* Checks the response
*/
private static void validateResponse(ResponseAPDU response)
throws CardException
int respSW1=0;
int respSW2=0;
respSW1 = response.getSW1();
respSW2 = response.getSW2();
System.out.println("SW1 ->"+respSW1 + ", SW2 ->"+ respSW2);
//TODO Fix message!!
if (respSW1 != 144)
throw new CardException("Autentication Problem?");
【讨论】：
【参考方案3】：当您知道它是什么卡后，您可以查看数据表https://www.nxp.com/docs/en/data-sheet/MF1S70YYX_V1.pdf，了解它的内存结构以及它支持哪些命令。
然后如何从阅读器的 PICC 命令中将它们包装到伪 APDU 中（https://www.acs.com.hk/download-manual/419/API-ACR122U-2.04.pdf 的第 5 节）
【讨论】：
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