Comm.jar是Sub实现底层串口操作的API,调用了本地的DLL文件,因为Java本身不具备直接访问硬件设置的能力,都是通过调用本地方法来实现的.可以Java的官方网站下载.下载之后把其中Comm.jar包导入到工程的Classpath中,把另外两个非常重要的文件javax.comm.properties和win32com.dll考贝到你的工程目录下,即java.user下.-Comm.jar is Sub achieve bottom of the serial port operation API, Call the local DLL files, because Java itself does not have direct access to the hardware, are by calling the local approach to achieve. Java can be downloaded from the official website. Download them after making Comm . Pack into the jar works Classpath, another two very important documents and win32c javax.comm.properties om.dll Bedouin to take your project directory, java.user under.