import java.util.*;
import javax.smartcardio.*;
public class Terminals{
public static void main (String [] args) throws Exception{
TerminalFactory factory = TerminalFactory.getDefault ();
System.out.println ("Default factory: "+factory);
dumpTerminals (factory);
factory = TerminalFactory.getInstance ("PC/SC", null);
System.out.println ("PC/SC factory: "+factory);
dumpTerminals (factory);
}
static void dumpTerminals (TerminalFactory factory) throws Exception{
List<CardTerminal> terminals = factory.terminals ().list ();
for (CardTerminal terminal: terminals)
System.out.println (terminal);
}
}
此代码未检测到WINDOWS 8.1 pro中的COM端口。它打印Default factory: TerminalFactory for type None from provider None和一些错误
Exception in thread "main" java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: PC/SC, provider: SunPCSC, class: sun.security.smartcardio.SunPCSC$Factory)
at java.security.Provider$Service.newInstance(Provider.java:1259)
at sun.security.jca.GetInstance.getInstance(GetInstance.java:243)
at sun.security.jca.GetInstance.getInstance(GetInstance.java:190)
at javax.smartcardio.TerminalFactory.getInstance(TerminalFactory.java:243)
at Terminals.main(Terminals.java:10)
Caused by: sun.security.smartcardio.PCSCException: SCARD_E_NO_SERVICE
at sun.security.smartcardio.PCSC.SCardEstablishContext(Native Method)
at sun.security.smartcardio.PCSCTerminals.initContext(PCSCTerminals.java:56)
at sun.security.smartcardio.SunPCSC$Factory.<init>(SunPCSC.java:60)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at java.security.Provider$Service.newInstance(Provider.java:1254)
... 4 more
即使MIFARE读卡器连接到COM端口的笔记本电脑。 我尝试多次断开连接永远不会成功。我已经安装了所需的驱动程序，用于读卡器设备驱动程序正常工作。
Why it's not recognising card reader?