Java调用IC卡读卡器的DLL一般有以下2种方式:

1.使用JNative第三方库调用IC卡读卡器dll的接口.

2.使用JNI调用IC卡读卡器dll的接口.

JNative调用IC卡读卡器dll很方便,只要知道接口名称和参数类型即可调用， 缺点是仅支持32位的程序， 不支持64位。

JNI调用IC卡读卡器的DLL，既支持64位程序也支持32位程序， 调用也非常方便，下面将介绍JNI调用IC卡读卡器DLL的方式。

对于经常使用的普通IC卡为例， 首先声明相关的api接口：

public native int YW_USBHIDInitial();
public native int YW_USBHIDFree();
public native int YW_Buzzer(int ReaderID,int Time_ON, int Time_OFF, int Cycle);
public native int YW_Led(int ReaderID,int LEDIndex, int Time_ON, int Time_OFF, int Cycle, int LedIndexOn);
public native int YW_AntennaStatus(int ReaderID,boolean Status);
public native int YW_SearchCardMode(int ReaderID,int Mode);
public native int YW_RequestCard(int ReaderID,int RequestMode, short CardType[]);
public native int YW_AntiCollide(int ReaderID, byte LenSNO[], byte SNO[]);
public native int YW_CardSelect(int ReaderID,byte LenSNO, byte SNO[]);
public native int YW_DownLoadKey(int ReaderID,int KeyIndex, byte Key[]);
public native int YW_KeyDown_Authorization(int ReaderID,int KeyMode, int BlockAddr, byte KeyIndex);
public native int YW_KeyAuthorization(int ReaderID,int KeyMode, int BlockAddr, byte[]Key);
public native int YW_ReadaBlock(int ReaderID,int BlockAddr, int LenData, byte pData[]);
public native int YW_WriteaBlock(int ReaderID,int BlockAddr, int LenData, byte pData[]);
public native int YW_Purse_Initial(int ReaderID,int BlockAddr, int IniMoney);
public native int YW_Purse_Read(int ReaderID,int BlockAddr,  int Money[]); 
public native int YW_Purse_Decrease(int ReaderID,int BlockAddr, int Decrement);
public native int YW_Purse_Charge(int ReaderID,int BlockAddr, int Charge);
public native int YW_CardHalt(int ReaderID);
public native int YW_Restore(int ReaderID,int BlockAddr);
public native int YW_Transfer(int ReaderID,int BlockAddr);
public native int YW_AntiCollideAndSelect(int ReaderID,byte ReturnMode,  byte CardMem[],  byte SNLen[], byte SN[]);

然后静态装载dll,64位程序装载64位的dll，32位装载32位的dll。

static {

System.loadLibrary("YW60X-32");

}

经过以上声明后，就可以直接调用接口了，如：

YOWORFID rfidreader = new YOWORFID();

rfidreader.YW_USBHIDInitial();

int rt =0;

rt =rfidreader.YW_RequestCard(ReaderID,Requestmode,Cardtype);

rt = rfidreader.YW_AntiCollide(ReaderID,LenSn,CardNo);

HexToStr(CardNo,LenSn[0]);

rt =rfidreader.YW_CardSelect(ReaderID,LenSn[0],CardNo);

rt =rfidreader.YW_KeyAuthorization(ReaderID,96,4,Key);

System.out.printf("KeyAuthorization=%d",rt);System.out.println();

rt =rfidreader.YW_ReadaBlock(ReaderID,4,16,BlockData);

System.out.printf("YW_ReadaBlock=%d",rt);System.out.println();

if(rt>0){HexToStr(BlockData,16);}

rfidreader.YW_Led(ReaderID,1,1,1,3,0);

rfidreader.YW_USBHIDFree();