Question

您好我正在尝试制作java桌面应用程序，我从我的java字符串变量中的seril端口接收值，并且我通过硬件设备接收数据，这将连续抛出数据我现在将数据存储在字符串变量中我想从中获得一些特定的数据。

所以我怎样才能实现这一点？我正在接收以下格式的数据

$GPRMC,235949.799,V,,,,,0.00,0.00,050180,,,N*46
$GPVTG,0.00,T,,M,0.00,N,0.00,K,N*32
$GPGGA,235949.799,,,,,0,0,,,M,,M,,*4F
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGSV,1,1,00*79
$GPGLL,,,,,235949.799,V,N*7D
$GPTXT,01,01,02,ANTSTATUS=OPEN*2B

此字符串不断接收

我想从这个字符串中获取每个String的第一行

这是我的代码

public class ListPortClass
{
 private int times = 0;



public static void main(String[] s)

{
    BufferedReader br = null;
try
{
     String sCurrentLine;
CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier("COM6");
if (portIdentifier.isCurrentlyOwned())
{
System.out.println("Port in use!");
}
else {
System.out.println(portIdentifier.getName());

SerialPort serialPort = (SerialPort) portIdentifier.open("ListPortClass", 300);
int b = serialPort.getBaudRate();
System.out.println(Integer.toString(b));
serialPort.setSerialPortParams(300, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
OutputStream mOutputToPort = serialPort.getOutputStream();
InputStream mInputFromPort = serialPort.getInputStream();
String mValue = "DEBUG_GPS";
System.out.println("beginning to Write . \r\n");
mOutputToPort.write(mValue.getBytes());
System.out.println("DEBUG_GPS Command Written to Port. \r\n");
mOutputToPort.flush();
System.out.println("Waiting for Reply \r\n");
Thread.sleep(500);
byte mBytesIn [];// = new byte[48];
//for(int i=0;i<=mBytesIn.length;i++){
mInputFromPort.read(); 
try{
while(true){
int a = mInputFromPort.read();
char c=(char)a;
//String  c =String.valueOf(a);
//System.out.print(c);
String temp = Character.toString(c);
System.out.print(temp);

}}
catch(IOException e)
{System.out.println(e);}

mOutputToPort.close(); 
mInputFromPort.close();
}
}
catch (Exception ex)
{

System.out.println("Exception : " + ex.getMessage());
}
}
}

这是我更新的代码

public static void main(String[] s)

{
    BufferedReader br = null;
try
{
     String sCurrentLine;
CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier("COM6");
if (portIdentifier.isCurrentlyOwned())
{
System.out.println("Port in use!");
}
else {
System.out.println(portIdentifier.getName());

SerialPort serialPort = (SerialPort) portIdentifier.open("ListPortClass", 300);
int b = serialPort.getBaudRate();
System.out.println(Integer.toString(b));
serialPort.setSerialPortParams(300, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
OutputStream mOutputToPort = serialPort.getOutputStream();
InputStream mInputFromPort = serialPort.getInputStream();
String mValue = "DEBUG_GPS";
System.out.println("beginning to Write . \r\n");
mOutputToPort.write(mValue.getBytes());
System.out.println("DEBUG_GPS Command Written to Port. \r\n");
mOutputToPort.flush();
System.out.println("Waiting for Reply \r\n");
Thread.sleep(500);

try {

            br = new BufferedReader (new InputStreamReader(mInputFromPort));
            while ((sCurrentLine = br.readLine()) != null) {
                System.out.println(sCurrentLine);
            }
}
catch(IOException e){
    e.printStackTrace();
}

//mOutputToPort.close(); 
//mInputFromPort.close();
}
}
catch (Exception ex)
{

System.out.println("Exception : " + ex.getMessage());
}
}
}

我做了以下代码更新代码

Answer 1

您已在代码中定义了aBufferedReader对象，但未使用。如果您使用，则可以使用readLine方法。在每次成功读取一行后，您可以将其发送到另一个方法进行处理。

将您的BufferedReader构造为

br = new BufferedReader(new InputStreamReader(mInputFromPort));

你想要的是

//for(int i=0;i<=mBytesIn.length;i++){

// CUT ALL OF THIS CODE

// until here 
try {

        br = new BufferedReader (new InputStreamReader(mInputFromPort));
        while ((sCurrentLine = br.readLine()) != null) {
            System.out.println(sCurrentLine);
        }
} catch(IOException e){
e.printStackTrace();
}

你不想做mInputFromPort.read();件事，你现在将使用readLine代码而不是

如何读取特定的字符串？

1 个答案: