从Java中的端口读取 [英] Reading from a port in Java
本文介绍了从Java中的端口读取的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是场景:
1..我有一个连接到计算机的GSM调制解调器，它可以正常工作，可以通过内置程序读取和发送SMS.
2..分配给我的gsm调制解调器的端口是COM11.我是从DeviceManager -> modems -> myModem-> Advance -> AdvancePortSettings看到的.
3..我编写Java代码以读取传入的消息.
1. I have a GSM modem which is connected to my computer, It's working I can read and send SMS via the built-in program.
2. The port assign to my gsm modem is COM11 . I saw it from DeviceManager -> modems -> myModem-> Advance -> AdvancePortSettings.
3. I write the Java code to read incomming message.
代码如下:
public class PScanner implements SerialPortEventListener, Runnable {
CommPortIdentifier pid = null;
SerialPort sp;
BufferedReader input;
OutputStream output;
public PScanner() {
try {
Enumeration e = CommPortIdentifier.getPortIdentifiers();
while (e.hasMoreElements()) {
CommPortIdentifier cpi = (CommPortIdentifier) e.nextElement();
if (cpi.getName().equals("COM11")) {
pid = cpi;
break;
}
}
sp = (SerialPort) pid.open(getClass().getName(), 2000);
sp.setSerialPortParams(115200, SerialPort.DATABITS_8,
SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
InputStream is = sp.getInputStream();
input = new BufferedReader(new InputStreamReader(is));
output = sp.getOutputStream();
sp.addEventListener(this);
sp.notifyOnDataAvailable(true);
new Thread(this).start();
} catch (Exception ex) {
ex.printStackTrace();
}
}
public synchronized void serialEvent(SerialPortEvent oEvent) {
System.out.println("serialEvent CallBack");
}
public synchronized void close() {
if (sp != null) {
sp.removeEventListener();
sp.close();
}
}
@Override
public void run() {
try {
Thread.sleep(20000);
} catch (InterruptedException ex) {
Logger.getLogger(PScanner.class.getName()).log(Level.SEVERE, null, ex);
} finally {
System.out.println("done");
}
}
}
在GSM调制解调器上发送SMS时，没有进入serialEvent()回调方法.
有人知道发生了什么吗? 我没有收到任何错误或异常.
When I send an SMS on the GSM modem, I am not getting in serialEvent() call back method.
Do anyone know what is going on? I am not getting any error or exceptions.
推荐答案
下面的代码，是使用GSM模块发送和读取消息的，可能对您有帮助
The following code , is to send and read message using a GSM module, this may help you
import java.sql.*;
import java.io.*;
import java.util.*;
import java.text.*;
import gnu.io.*;
public class SerialComm implements SerialPortEventListener
{
int result=0;
static CommPortIdentifier portId=null;
Enumeration portList=null;
static InputStream inputStream=null;
static OutputStream out=null;
static SerialPort serialPort=null;
static int srate=9600;//B-Rate
String data=null;
int i=0;
String number="";
int status=0;
public String recvdData="aa";
String pswd="";
String actualpswd="";
public static void main(String args[])
{
SerialComm obj=new SerialComm();
}
public SerialComm()
{
try
{
if(this.detectPort())
{
if(this.initPort())
{
//Thread.sleep(2000);
// sendMessage();
}
}
}
catch(Exception e)
{
System.out.println("Error in SerialComm()-->"+e);
}
}
public boolean detectPort()
{
boolean portFound = false;
//String defaultPort = "/dev/ttyUSB0";
String defaultPort = "COM1";
try
{
portList = CommPortIdentifier.getPortIdentifiers();
while (portList.hasMoreElements())
{
CommPortIdentifier portID = (CommPortIdentifier) portList.nextElement();
if (portID.getPortType() == CommPortIdentifier.PORT_SERIAL)
{
if (portID.getName().equals(defaultPort))
{
this.portId=portID;
System.out.println("Found port: "+portId.getName());
portFound = true;
break;
}
}
}
if (!portFound)
{
System.out.println("port " + defaultPort + " not found.");
}
}
catch(Exception e)
{
portFound = false;
}
return portFound;
}
public boolean initPort()
{
try
{
serialPort = (SerialPort) portId.open("SerialCommApp", 2000);
}
catch (PortInUseException e)
{
System.out.println("Port in use-->"+e);
}
try
{
inputStream = serialPort.getInputStream();
out=serialPort.getOutputStream();
}
catch (IOException e)
{
System.out.println("IO Error-->"+e);
}
try
{
serialPort.addEventListener(this);
}
catch (TooManyListenersException e)
{
System.out.println("Too many LIstener-->"+e);
}
serialPort.notifyOnDataAvailable(true);
try
{
serialPort.setSerialPortParams(srate, SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
serialPort.setFlowControlMode(SerialPort.FLOWCONTROL_RTSCTS_IN | SerialPort.FLOWCONTROL_RTSCTS_OUT);
}
catch (UnsupportedCommOperationException e)
{
System.out.println("Error while setting parameters-->"+e);
}
System.out.println("Port Initialized....");
return true;
}
public synchronized void serialEvent(SerialPortEvent event)
{
switch (event.getEventType())
{
case SerialPortEvent.DATA_AVAILABLE:
System.out.println("DATA_AVAILABLE");
byte[] readBuffer = new byte[1024];
int numBytes=1024;
data="";
try
{
Thread.sleep(100);
while (inputStream.available() > 0)
{
numBytes = inputStream.read(readBuffer);//count of reading data
data=data+new String(readBuffer,0,numBytes);
data=data.trim();
this.recvdData+=data;
}
System.out.println("data=========="+this.recvdData);
}
catch (Exception e)
{
System.out.println("Exception in serial event-->"+e);
}
break;//break from switch case 1:
}//end of switch
}
阅读消息的方法
public void sendMessage(String num, String msg) {
try{
System.out.println("Sending Message");
this.recvdData="";
String dq=String.valueOf((char)34);
String mysms="AT+CMGS="+dq+num+dq;
out.write(mysms.getBytes());
out.write(13);
Thread.sleep(500);
mysms=msg;
out.write(mysms.getBytes());
out.write(26);
out.write(13);
Thread.sleep(500);
if(this.recvdData.contains("OK"))
{
return;
}else if(this.recvdData.contains(">")){
out.write(26);
out.write(13);
sendMessage(num,msg);
}else{
sendMessage(num,msg);
}
return;
}catch(Exception e){
System.out.println(e);
}
}
检查这些代码，通过使用此代码，我得到了输出，
Check these code, i got the output by using this code,
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