Question

我的3G Modem端口上的计算机上安装了COM9。我想从该端口读取传入的sms。我使用下面的代码。

import java.io.InputStream;
import java.util.Enumeration;
import javax.comm.CommPortIdentifier;
import javax.comm.SerialPort;
import javax.comm.SerialPortEvent;
import javax.comm.SerialPortEventListener;

/**
 *
 * @author IamUsman
 */
public class ReadingPorts implements SerialPortEventListener, Runnable {

    static CommPortIdentifier portId;
    static Enumeration portList;
    static SerialPort port;
    static InputStream inputStream;
    static Thread readThread;
    static byte buffer[];

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        portList = CommPortIdentifier.getPortIdentifiers();
        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals("COM9")) {
                    if (!portId.isCurrentlyOwned()) {
                        ReadingPorts rp = new ReadingPorts();
                    } else {
                        System.out.println("This port is already used by some other program");
                    }

                }
            }
        }
    }

    public ReadingPorts() {
        try {
            port = (SerialPort) portId.open("Custom", 500);
            inputStream = port.getInputStream();
            System.out.println("** Connected To Streams **");
            port.addEventListener(this);
            port.notifyOnDataAvailable(true);
            port.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
            port.setFlowControlMode(SerialPort.FLOWCONTROL_NONE);
            port.enableReceiveTimeout(500);
            System.out.println("................................");
            readThread = new Thread(this);
            readThread.start();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    public void serialEvent(SerialPortEvent event) {
        System.out.println("In Callback method");
        switch(event.getEventType()){
            case SerialPortEvent.DATA_AVAILABLE:
                buffer = new byte[8];
                try{
                    while (inputStream.available()>0) {
                        int numBytes = inputStream.read(buffer);
                    }
                    System.out.println(new String(buffer));
                }catch(Exception ex){
                    ex.printStackTrace();
                }
                break;
        }
    }

    @Override
    public void run() {
        try {
            Thread.sleep(500);
        } catch (Exception ex) {
            ex.printStackTrace();;
        }

    }
}

我正在阅读数据，但这很有意义。我读到的东西在下面

+CMTI: "SM",14

Answer 1

我读到的文字毫无意义

那是因为你用以下无意义的代码阅读它：

while (inputStream.available()>0) {
    int numBytes = inputStream.read(buffer);
}
System.out.println(new String(buffer));

应该是：

while (inputStream.available()>0) {
    int numBytes = inputStream.read(buffer);
    System.out.println(new String(buffer, 0, numBytes));
}

无法从com端口解析实际数据

1 个答案: