最近做了一個(gè)與硬件相關(guān)的項(xiàng)目，剛開(kāi)始聽(tīng)說(shuō)用java和硬件打交道，著實(shí)下了一大跳。java也可以操作硬件？
后來(lái)接觸到是用java通過(guò)串口通信控制硬件感覺(jué)使用起來(lái)還不錯(cuò)，也很方便。
特拿出來(lái)和大家一起分享一下。
準(zhǔn)備工作：
首先到SUN官網(wǎng)下載一個(gè)zip包：javacomm20-win32.zip
其中重要的有這幾個(gè)文件：
win32com.dll
comm.jar
javax.comm.properties
按照說(shuō)明配置好環(huán)境,如下：
將win32com.dll復(fù)制到<JDK>\bin目錄下；將comm.jar復(fù)制到<JDK>\lib；把 javax.comm.properties也同樣拷貝到<JDK>\lib目錄下。然而在真正運(yùn)行使用串口包的時(shí)候，僅作這些是不夠的。因 為通常當(dāng)運(yùn)行“java MyApp”的時(shí)候，是由JRE下的虛擬機(jī)啟動(dòng)MyApp的。而我們只復(fù)制上述文件到JDK相應(yīng)目錄下，所以應(yīng)用程序?qū)?huì)提示找不到串口。解決這個(gè)問(wèn)題的 方法很簡(jiǎn)單，我們只須將上面提到的文件放到JRE相應(yīng)的目錄下就可以了
到這一個(gè)可以java 串口開(kāi)發(fā)環(huán)境就搭建完成了
確認(rèn)本機(jī)可以使用的串口：
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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(); }} |
打開(kāi)串口，關(guān)閉串口：
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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;// 任意取一個(gè)串口，比如com1 } } public boolean openPort() { try { testPort = (SerialPort) myPort.open("COM1", 500);// 注意這里必須換成一個(gè)真實(shí)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("打開(kāi)com1機(jī)串口成功"); return true; } catch (PortInUseException e) { // TODO Auto-generated catch block e.printStackTrace(); return false; } } /** * TODO 關(guān)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("關(guān)閉COM1串口成功"); return true; } catch (Exception e) { // TODO Auto-generated catch block // e.printStackTrace(); System.out.println("關(guān)閉COM1串口失敗"); return false; } } public static void main(String[] args) { GetSerialPorts GSP = new GetSerialPorts(); GSP.listPortChoices(); GSP.openPort(); }} |
讀數(shù)據(jù)：
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/** * TODO 接收端口數(shù)據(jù) * * @param InputStream * @return String * @throws */ public String readData(InputStream is) { // 讀取緩沖區(qū)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(shí)數(shù)據(jù)保存到零時(shí)數(shù)組中 byte[] readTemp = new byte[readDataLength]; for (int i = 0; i < readDataLength; i++) { readTemp[i] = readBuffer[i]; } // 將byte數(shù)組轉(zhuǎn)換為16進(jìn)制字符串 String stringTemp = FeelTheBase.bytesToHexString(readTemp); // System.out.println("指令返回值" + stringTemp); return stringTemp; } |
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