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java 完成串口通訊
最近做了一個與硬件相關的項目,剛開端聽說用java和硬件打交道,著實下了一大跳。java也可以操作硬件?
後來接觸到是用java經過串口通訊控制硬件覺得運用起來還不錯,也很方便。
特拿出來和大家一同分享一下。
預備任務:
首先到SUN官網下載一個zip包:javacomm20-win32.zip
其中重要的有這幾個文件:
win32com.dll
comm.jar
javax.comm.properties
依照闡明配置好環境,如下:
將win32com.dll復制到<JDK>\bin目錄下;將comm.jar復制到<JDK>\lib;把 javax.comm.properties也異樣拷貝到<JDK>\lib目錄下。但是在真正運轉運用串口包的時分,僅作這些是不夠的。因 為通常當運轉“java MyApp”的時分,是由JRE下的虛擬機啟動MyApp的。而我們只復制上述文件到JDK相應目錄下,所以使用順序將會提示找不到串口。處理這個問題的 辦法很復雜,我們只須將下面提到的文件放到JRE相應的目錄下就可以了
到這一個可以java 串口開發環境就搭建完成了
確認本機可以運用的串口:
package test; import java.util.Enumeration; import java.util.HashMap; import javax.comm.CommPortIdentifier; import javax.comm.SerialPort; public class GetSerialPorts { public void listPortChoices() { CommPortIdentifier portId; Enumeration en = CommPortIdentifier.getPortIdentifiers(); // iterate through the ports. while (en.hasMoreElements()) { portId = (CommPortIdentifier) en.nextElement(); if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) { System.out.println(portId.getName()); } } } public static void main(String[] args) { GetSerialPorts GSP = new GetSerialPorts(); GSP.listPortChoices(); } }
翻開串口,封閉串口:
package test; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Enumeration; import java.util.HashMap; import javax.comm.CommPortIdentifier; import javax.comm.PortInUseException; import javax.comm.SerialPort; import javax.comm.UnsupportedCommOperationException; public class GetSerialPorts { private CommPortIdentifier portId; private SerialPort testPort; private CommPortIdentifier myPort; private InputStream is; private OutputStream os; public void listPortChoices() { Enumeration en = CommPortIdentifier.getPortIdentifiers(); // iterate through the ports. while (en.hasMoreElements()) { portId = (CommPortIdentifier) en.nextElement(); if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) { System.out.println(portId.getName()); } myPort = portId;// 恣意取一個串口,比方com1 } } public boolean openPort() { try { testPort = (SerialPort) myPort.open("COM1", 500);// 留意這裡必需換成一個真實的串口 try { this.testPort.setSerialPortParams(38400, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_EVEN); } catch (UnsupportedCommOperationException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { this.testPort.enableReceiveTimeout(30); } catch (UnsupportedCommOperationException e) { // TODO Auto-generated catch block e.printStackTrace(); } this.testPort.setOutputBufferSize(1024); this.testPort.setInputBufferSize(1024); try { this.is = this.testPort.getInputStream(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { this.os = this.testPort.getOutputStream(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } this.testPort.notifyOnDataAvailable(true); this.testPort.notifyOnOutputEmpty(true); this.testPort.notifyOnBreakInterrupt(true); // this.printerPort.addEventListener(new PrintPortListener(is)); System.out.println("翻開com1機串口成功"); return true; } catch (PortInUseException e) { // TODO Auto-generated catch block e.printStackTrace(); return false; } } /** * TODO 封閉端口 * * @param * @return Map * @throws */ public boolean closePort() { // TODO Auto-generated method stub try { if (null != this.testPort) { is.close(); os.close(); this.testPort.close(); } System.out.println("封閉COM1串口成功"); return true; } catch (Exception e) { // TODO Auto-generated catch block // e.printStackTrace(); System.out.println("封閉COM1串口失敗"); return false; } } public static void main(String[] args) { GetSerialPorts GSP = new GetSerialPorts(); GSP.listPortChoices(); GSP.openPort(); } }
讀數據:
/** * TODO 接納端口數據 * * @param InputStream * @return String * @throws */ public String readData(InputStream is) { // 讀取緩沖區域 byte[] readBuffer = new byte[4096]; int readDataLength = 0; try { readDataLength = is.read(readBuffer); // for (byte b : readBuffer) { // System.out.print(b); // } // System.out.println(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); return null; } // 將真實數據保管到零時數組中 byte[] readTemp = new byte[readDataLength]; for (int i = 0; i < readDataLength; i++) { readTemp[i] = readBuffer[i]; } // 將byte數組轉換為16進制字符串 String stringTemp = FeelTheBase.bytesToHexString(readTemp); // System.out.println("指令前往值" + stringTemp); return stringTemp; }
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