使用 Java 自动检测哪个 Com 端口连接到 USB GSM 调制解调器

Question

我编写了一个 Java 应用程序，用于从 USB GSM 调制解调器读取和发送 SMS 消息。我正在使用 SMSLib（它使用 JavaCommAPI），它在 Windows 上运行。我需要传入调制解调器似乎已连接的 COM 端口。

到目前为止，我一直在使用 Windows 设备管理器手动查找 COM 端口，并将其写入属性文件。我想知道是否有办法检测调制解调器以编程方式连接到哪个 COM 端口？

1. 这样就省去了每次查找的麻烦
2. 如果我有时拔掉/重新插入端口号，端口号就会改变

谢谢！

Answer 1

package com.cubepro.util;

import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Formatter;

import org.apache.log4j.Logger;
import org.smslib.helper.CommPortIdentifier;

import com.cubepro.general.CommonConstants;

import com.cubepro.util.SendMessage;

public class CommPortTester {
   private static final String _NO_DEVICE_FOUND = "  no device found";

   private final static Formatter _formatter = new Formatter(System.out);

   private static Logger log = Logger.getLogger(CommPortTester.class);

   static CommPortIdentifier portId;

   static Enumeration<CommPortIdentifier> portList;

   static int bauds[] = { 9600, 14400, 19200, 28800, 33600, 38400, 56000,
                          57600, 115200 };

   public static final String MAINCLASS = "org.smslib.Service";

   public CommPortTester() throws Exception {
      Class.forName(MAINCLASS);
   }

   /**
    * Wrapper around {@link CommPortIdentifier#getPortIdentifiers()} to be
    * avoid unchecked warnings.
    */
   private static Enumeration<CommPortIdentifier> getCleanPortIdentifiers() {
      return CommPortIdentifier.getPortIdentifiers();
   }

   public String testAndQualifyPort() throws Exception {
      String status = CommonConstants.MODEM_STATUS_ERROR;
      SendMessage sendMessage = new SendMessage();

      log.debug("\nSearching for devices...");
      portList = getCleanPortIdentifiers();

      while (portList.hasMoreElements()) {
         portId = portList.nextElement();
         if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
            _formatter.format("%nFound port: %-5s%n", portId.getName());
            try {
               if(portId.getName()
               boolean comPortSuccess = sendMessage.doIt(portId.getName());
               if(comPortSuccess == true){
                  return portId.getName();
               }
            } catch (final Exception e) {
               log.debug(" Modem error occured -",e);
            }
         }
      }
      log.debug("\nTest complete.");
      return status;
   }

   public static void main(String[]args){
      try{
      CommPortTester tester = new CommPortTester(); 
      tester.testAndQualifyPort();
      }catch(Exception e){
         e.printStackTrace();
      }
   }
}