Java調用IC卡讀卡器的DLL一般有以下2種方式:

1.使用JNative第三方庫調用IC卡讀卡器dll的接口.

2.使用JNI調用IC卡讀卡器dll的接口.

JNative調用IC卡讀卡器dll很方便,只要知道接口名稱和參數類型即可調用， 缺點是僅支持32位的程序， 不支持64位。

JNI調用IC卡讀卡器的DLL，既支持64位程序也支持32位程序， 調用也非常方便，下面將介紹JNI調用IC卡讀卡器DLL的方式。

對于經常使用的普通IC卡為例， 首先聲明相關的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[]);

然后靜態裝載dll,64位程序裝載64位的dll，32位裝載32位的dll。

static {

System.loadLibrary("YW60X-32");

}

經過以上聲明后，就可以直接調用接口了，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();