java 当端口存在时获取 javax.comm.NoSuchPortException
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getting a javax.comm.NoSuchPortException when the port exist
提问by Shantanu Banerjee
Hello I have seen this Why am I getting a Java NoSuchPortException when the port exists?post but It's not very clear to me!!
您好，我已经看到了为什么当端口存在时我会收到 Java NoSuchPortException？帖子，但对我来说不是很清楚！！
In device manager it shows COM3 is exist and I can connect it through putty, but this piece of code is getting this error/exception.
在设备管理器中，它显示 COM3 存在，我可以通过腻子连接它，但是这段代码出现了这个错误/异常。
try {
portId = CommPortIdentifier.getPortIdentifier("COM3");
} catch (NoSuchPortException ex) {
System.out.println(ex);
}
try {
serialPort = (SerialPort)portId.open("S2CFrameWork", 5000);
} catch (PortInUseException e) {
System.out.println(e);
}
this simple code thrown a javax.comm.NoSuchPortException, I have also tried this with using Enumeration to get the list of avilable port but still it shows exception. Can anyone solve this issue?
这个简单的代码抛出了一个 javax.comm.NoSuchPortException，我也尝试过使用枚举来获取可用端口列表，但它仍然显示异常。任何人都可以解决这个问题吗？
回答by Shantanu Banerjee
comm.jar should be placed in:
comm.jar 应该放在：
%JAVA_HOME%/lib
%JAVA_HOME%/jre/lib/ext
win32com.dll should be placed in:
win32com.dll 应该放在：
%JAVA_HOME%/bin
%JAVA_HOME%/jre/bin
%windir%System32
javax.comm.properties should be placed in:
javax.comm.properties 应该放在：
%JAVA_HOME%/lib
%JAVA_HOME%/jre/lib
