java 读取com口数据,在Java中从COM7端口读取图像数据
时间: 2024-03-07 07:47:10 浏览: 11
读取COM口数据可以通过Java的串口通信库进行实现。建议使用RXTX库来进行串口通信。以下是一个简单的示例代码,演示了如何从COM7端口读取数据并将其保存为图像文件。
```java
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.util.Enumeration;
public class SerialTest {
private static final String PORT_NAME = "COM7";
private static final int TIMEOUT = 2000;
private static final int BAUD_RATE = 9600;
public static void main(String[] args) {
CommPortIdentifier portId = null;
Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();
// iterate through available ports and try to connect to COM7
while (portEnum.hasMoreElements()) {
CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
if (currPortId.getName().equals(PORT_NAME)) {
portId = currPortId;
break;
}
}
if (portId == null) {
System.err.println("Could not find COM7 port.");
return;
}
try {
// open serial port and set port parameters
SerialPort serialPort = (SerialPort) portId.open("SerialTest", TIMEOUT);
serialPort.setSerialPortParams(BAUD_RATE, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
// get input stream and output stream
InputStream in = serialPort.getInputStream();
OutputStream out = serialPort.getOutputStream();
// read data from input stream and save as image file
byte[] buffer = new byte[1024];
int len = -1;
FileOutputStream fos = new FileOutputStream("image.jpg");
while ((len = in.read(buffer)) > -1) {
fos.write(buffer, 0, len);
}
fos.close();
// close streams and serial port
in.close();
out.close();
serialPort.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
```
请注意,以上代码仅适用于读取二进制数据,并将其保存到图像文件中。如果您需要读取其他类型的数据,请根据您的实际需求进行更改。