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POHow to clear the OutputStream of a SerialPort in java, without having to close it?
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copied!<p>I'm using the SerialPort class to connect to a USB modem and send an SMS. I can succesfully send a message. But when I do, there seems to be some data that comes as a reply from the modem and I need to clear it to list all the data on the USB modem.</p> <p>This is my code to send the message.--</p> <pre><code>import java.io.*; import java.util.*; import java.util.regex.*; import javax.comm.*; import java.net.*; import java.sql.*; import java.lang.String.*; public class recving implements SerialPortEventListener { static CommPortIdentifier id; public static SerialPort sp; static OutputStream os; static InputStream is; static Enumeration pl; static PrintStream ps; public static OutputStream f1; public static void main(String[] args) { String line1 = "AT+CMGS=\"phonenumber\"\r\n"+"a simple message"+((char)26); pl = CommPortIdentifier.getPortIdentifiers(); while (pl.hasMoreElements() ) { try{ id= CommPortIdentifier.getPortIdentifier("COM4"); } catch(Exception e) { System.out.println(e); } id = (CommPortIdentifier) pl.nextElement(); if (id.getPortType() == CommPortIdentifier.PORT_SERIAL) { if ( id.getName().equals("COM4")) { try { if(id.isCurrentlyOwned()) { sp.close(); } else sp = (SerialPort) id.open("id",1000); recving wr = new recving(sp); } catch (PortInUseException e) { System.out.println("Port In Use " + e); } try { os = sp.getOutputStream(); } catch (IOException e) { System.out.println("Error writing to output stream " + e); } try { ps = new PrintStream(sp.getOutputStream()); } catch (Exception e1) { System.out.println("Error printing to output stream " + e1); } try { sp.setSerialPortParams(57600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE); } catch (UnsupportedCommOperationException ex) { System.out.println("exception " + ex); } try { os.write(line1.getBytes()); os.flush(); } catch (Exception exe) { System.out.println("Error writing message " + exe); } } } } } public recving(SerialPort serial) { try { is = serial.getInputStream(); try { serial.addEventListener(this); } catch (TooManyListenersException e) { System.out.println("Exception in Adding Listener" + e); } serial.notifyOnDataAvailable(true); } catch (Exception ex) { System.out.println("Exception in getting InputStream" + ex); } } public void serialEvent(SerialPortEvent event) { CharSequence key="+CMTI:"; String line3="AT+CMGL=0\r\n"; 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: { /*here i check the stream and data comes up !! I dont want to parse any data when I send a message. and this interferes with the reading of data from the modem because there is data in the stream and I'm unable to pull up the required data by executing a command, So I need to be able to clear this stream up*/ is = sp.getInputStream(); BufferedReader br = new BufferedReader(new InputStreamReader(is)); String n = new String(); while((n= br.readLine())!= null){ System.out.println(n); } break; } } } </code></pre> <p>Any help on this subject would be highly appreciated. Thanks in advance !</p>

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