您可以使用此免费的Java示例程序使用连接到计算机的GSM调制解调器将PC上的SMS发送到COM端口。您还需要从Sun下载并安装Java comm api。

该程序需要以下Java文件才能运行。

1. SerialConnection.java（此文件用于从Java程序连接到COM端口）

2. SerialConnectionException.java（此文件用于处理Java程序中的串行连接异常）

3. SerialParameters.java（此程序用于设置COM端口属性，以从Java程序连接到COM端口）

4. Sender.java（这是实现可运行并使用串行连接发送SMS的程序）

5. SMSClient.java（此Java类是可以在您自己的java程序中实例化并调用以发送SMS的主类。该程序将在内部使用上述所有四个文件来发送SMS）。

下载发送SMS Java示例程序文件

/*
 *
 * A free Java sample program 
 * A list of java programs to send SMS using your COM serial connection
 * and a GSM modem
 *
 * @author William Alexander
 * free for use as long as this comment is included 
 * in the program as it is
 * 
 * More Free Java programs available for download 
 * at http://www.java-samples.com
 *
 *
 * Note: to use this program you need to download all the 5 java files
 * mentioned on top
 *
 */
public class SMSClient implements Runnable{

  public final static int SYNCHRONOUS=0;
  public final static int ASYNCHRONOUS=1;
  private Thread myThread=null;

  private int mode=-1;
  private String recipient=null;
  private String message=null;

  public int status=-1;
  public long messageNo=-1;


  public SMSClient(int mode) {
      this.mode=mode;
    }

  public int sendMessage (String recipient, String message){
    this.recipient=recipient;
    this.message=message;
    //System.out.println("recipient: " + recipient + " message: " + message);
    myThread = new Thread(this);
    myThread.start();
//    run();
    return status;
    }
    public void run(){

    Sender aSender = new Sender(recipient,message);

    try{
      //send message
          aSender.send ();

         // System.out.println("sending ... ");

      //in SYNCHRONOUS mode wait for return : 0 for OK,
      //-2 for timeout, -1 for other errors
      if (mode==SYNCHRONOUS) {
          while (aSender.status == -1){
            myThread.sleep (1000);
          }
      }
      if (aSender.status == 0) messageNo=aSender.messageNo ;

    }catch (Exception e){

        e.printStackTrace();

    }

    this.status=aSender.status ;

    aSender=null;


  }
}