java调用AT指令发送短信问题！！！

RXTXcomm.jar实现Java串口通信，发送信息时没报错，但也没收到信息。请帮忙看下什么原因呢?


以下源码：

public class J2MEMain {

        /**
         * @param args
         * 本类是发送短信的主类，负责调用其他类对象的函数
         */
        public static void main(String[] args) {
                SMSSend smsSend=new SMSSend();
                smsSend.sendSMS();
        }

}

//-----------------------------------------------------------------------------------------------------
import gnu.io.CommPortIdentifier;
import gnu.io.PortInUseException;
import gnu.io.SerialPort;
import gnu.io.UnsupportedCommOperationException;
import java.io.*;
import java.util.Enumeration;
import java.util.TooManyListenersException;
/*
* 短信发送的主要功能类
*/
public class SMSSend {
         SerialPort serialPort=null;
         CommPortIdentifier portId = null;
         Enumeration portList = CommPortIdentifier.getPortIdentifiers();
         final SMSReturnEventListener sMSReturnEventListener=new SMSReturnEventListener();
        public SMSSend(){
                 while (portList.hasMoreElements()){
                      CommPortIdentifier com = (CommPortIdentifier)portList.nextElement();
                      if (com.getPortType() == CommPortIdentifier.PORT_SERIAL){
                              portId=com;//由于已知机器上只有一个串口，因此这样就可以
                              break;
                      }
                 }
                
                 try {
                            serialPort=(SerialPort)portId.open("SMS", 2000);
                             System.out.println(serialPort.getName());
                        } catch (PortInUseException e) {
                                System.out.println("PortInUseException");
                                e.printStackTrace();
                        }
                       
                 try {
                                serialPort.setSerialPortParams(4800, SerialPort.DATABITS_8,   //设置串口读写参数
                                SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
                                serialPort.setFlowControlMode(SerialPort.FLOWCONTROL_RTSCTS_IN);
                        } catch (UnsupportedCommOperationException e) {
                        }
                       
                        
        }

       
        public void sendSMS(){
                InputStream inputStream = null;
                OutputStream outputStream = null;
                try {
                        inputStream = new BufferedInputStream(serialPort.getInputStream());
                        outputStream = new BufferedOutputStream(serialPort.getOutputStream());
                        sMSReturnEventListener.setInputStream(inputStream);
                        serialPort.notifyOnDataAvailable(true);
                        serialPort.addEventListener(sMSReturnEventListener);
                        outputStream.write("AT+CMGF=1".getBytes());
                        outputStream.write("AT+CNMI=2,2,0,0,0".getBytes());
                        outputStream.write("AT+CMPS=17,23,64,244".getBytes());
                        outputStream.write("AT+CGMI".getBytes());
                        outputStream.write("AT+CMGS='13880458775',10 ".getBytes());
                        outputStream.write("0x600xa80x590x7d0x000x1a".getBytes());
//                        outputStream.write(("您好".getBytes("GB2312")+"0x000x1a").getBytes());
//                        测试如何转换汉字为Unicode，希望成功
//                        也可以用AT指令调试精灵来把任何的语句进行Unicode编码
                } catch (IOException e) {
                        System.err.println("发生了某些异常");
                        e.printStackTrace();
                }catch (TooManyListenersException e) {
                        e.printStackTrace();
                }finally{
                        try {
                                inputStream.close();
                                outputStream.close();
                                serialPort.close();
                        } catch (IOException e) {
                                e.printStackTrace();
                        }//这一句很重要，必须关闭串口资源
                }
        }
}//class

//----------------------------------------------------------------------------------------------------
import java.io.IOException;
import java.io.InputStream;

import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
/*
* 短信发送AT指令可能有返回值，本事件监听器专门监听返回值
*/
public class SMSReturnEventListener implements SerialPortEventListener {

        private InputStream inputStream;

        @Override
        public void serialEvent(SerialPortEvent event) {
                System.out.println("得到了一些返回值");
                /*now I don't want to insert some programme into this block ,because
                 * I can't be sure that the super block would work well
                 */
                InputStream inputStream=null;
               
                switch (event.getEventType()) {
                   case SerialPortEvent.BI:
                   case SerialPortEvent.OE:
                   case SerialPortEvent.FE:
                   case SerialPortEvent.PE:
                   case SerialPortEvent.CD:
                   case SerialPortEvent.CTS:
                   case SerialPortEvent.DSR:
                   case SerialPortEvent.RI:
                   case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
                    break;
                   case SerialPortEvent.DATA_AVAILABLE://当有可用数据时读取数据,并且给串口返回数据
                    byte[] readBuffer = new byte[1024];
                    try {
                     while (inputStream.available() > 0) {//下一次可以不受阻塞而读取的字节数
                      int numBytes = inputStream.read(readBuffer);//从输入流中读取一定数量的字节，并将其存储在缓冲区数组readBuffer中。以整数形式返回实际读取的字节数。
                     }
                     System.out.println(new String(readBuffer));
                    } catch (IOException e){
                    }finally{
                            try {
                                        inputStream.close();
                                } catch (IOException e) {
                                        // TODO Auto-generated catch block
                                        e.printStackTrace();
                                }
                    }
                    break;
                   }
        }
       
        public void setInputStream(InputStream inputStream){
                this.inputStream=inputStream;
        }

}