NMEA GPS设备(串口)扫描实例 GPSSerialPortScaner

NMEA GPS设备(串口)扫描实例 GPSSerialPortScaner

1.Library:RXTXComm.jar



/*
 * GPSSerialPortScaner.java
 * Copyright (C) 2009  <[email protected]>
 *
 *        This program is free software; you can redistribute it and/or modify
 *        it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *     (at your option) any later version.
 *
 *       This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *        GNU General Public License for more details.
 *
  */
package  org.lambdasoft.serial.gps;
import  gnu.io.CommPort;
import  gnu.io.CommPortIdentifier;
import  gnu.io.PortInUseException;
import  gnu.io.SerialPort;
import  gnu.io.UnsupportedCommOperationException;

import  java.io.InputStream;
import  java.util.Enumeration;

import  org.lambdasoft.ui.dialog.BubbleDialog;
import  org.lambdasoft.ui.systray.statusbar.StatusBar;
import  org.lambdasoft.util.StringUtils;

/**
 *  @author  lei.tang ([email protected])
 * @date 2010-3-8
 *  @version
  */
public   class  GPSSerialPortScaner {
     private   static  GPSSerialPortScaner finder;
     private   static   final   int  SCANTIME  =   2000 ;
     private   static   final   int [] PORTSPEED  =   new   int []{ 4800 , 9600 };
     private  GPSSerialPortScaner() {}
    
     public   static  GPSSerialPortScaner getScaner() {
         if (finder  ==   null )
            finder  =   new  GPSSerialPortScaner();
         return  finder;
    }

     public  String scan() {
        BubbleDialog.getBubble().display( " GPS设备自动搜索中 " , false , false );
         for  ( int  speed : PORTSPEED) {
            String port  =  scan(speed);
             if (StringUtils.isNotEmpty(port))
                 return  port;
        }
         return   null ;
    }
    
    @SuppressWarnings( " unchecked " )
     public  String scan(Integer speed) {
        StatusBar statusBar  =  StatusBar.getBar();
        Enumeration < CommPortIdentifier >  commons  =  CommPortIdentifier.getPortIdentifiers();
        CommPortIdentifier com  =   null ;
        CommPort serialPort  =   null ;
         while  (commons.hasMoreElements()) {
            com  =  commons.nextElement();
             if (statusBar  !=   null )
                statusBar.setGPSInfo( " 扫描GPS设备: "   +  com.getName()  +   "  扫描速率: "   +  speed);
             try  {
                serialPort  =  com.open( " PortOpener " ,  10 );
            }  catch  (PortInUseException piue) {
                serialPort  =   null ;
                 continue ;
            }
             if  (com.getPortType()  ==  CommPortIdentifier.PORT_SERIAL) {
                SerialPort sp  =  (SerialPort) serialPort;
                 try  {
                     //  Settings for B&G Hydra
                    sp.setSerialPortParams(speed.intValue(), SerialPort.DATABITS_8,
                            SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
                }  catch  (UnsupportedCommOperationException ucoe) {
                    serialPort  =   null ;
                     continue ;
                }
            }
             try  {
                InputStream input  =  serialPort.getInputStream();
                 int  readChar  =   - 1 ;
                 long  currentTime  =  System.currentTimeMillis();
                 while ((System.currentTimeMillis()  -  currentTime)  <=  SCANTIME) {
                     if ((readChar  =  input.read())  ==   - 1 ) {
                         continue ;
                    }
                     if (( char )readChar  ==   ' $ ' ) {
                        StringBuilder builder  =   new  StringBuilder();
                         for  ( int  j  =   0 ; j  <   5 ; j ++ ) {
                            builder.append(( char )(input.read()));
                        }
                        String head  =  builder.toString();
                         if (head.equals( " GPGGA " )) {
                            serialPort.close();
                             if (statusBar  !=   null ) {
                                String successMsg  =   " GPS设备在端口 "   +  com.getName()  + " 初始化成功,速率:  "   +  speed;
                                BubbleDialog.getBubble().display(successMsg, false , true );
                                statusBar.setGPSInfo(successMsg);
                            }
                             return  com.getName();
                        }
                    }
                }
            }  catch  (Exception e) {
                 return   null ;
            }
            serialPort.close();
        }
         if (serialPort  !=   null )
            serialPort.close();
         return   null ;
    }
}