java调用modem执行at指令

package serialPort; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.ArrayList; import java.util.Enumeration; import java.util.TooManyListenersException; import gnu.io.CommPort; import gnu.io.CommPortIdentifier; import gnu.io.NoSuchPortException; import gnu.io.PortInUseException; import gnu.io.SerialPort; import gnu.io.SerialPortEventListener; import gnu.io.UnsupportedCommOperationException; import serialException.*; /** * 串口服务类，提供打开、关闭串口，读取、发送串口数据等服务（采用单例设计模式） * @author zhong * */ public class SerialTool { private static SerialTool serialTool = null; static { //在该类被ClassLoader加载时就初始化一个SerialTool对象 if (serialTool == null) { serialTool = new SerialTool(); } } //私有化SerialTool类的构造方法，不允许其他类生成SerialTool对象 private SerialTool() {} /** * 获取提供服务的SerialTool对象 * @return serialTool */ public static SerialTool getSerialTool() { if (serialTool == null) { serialTool = new SerialTool(); } return serialTool; } /** * 查找所有可用端口 * @return 可用端口名称列表 */ public static final ArrayList<String> findPort() { //获得当前所有可用串口 Enumeration<CommPortIdentifier> portList = CommPortIdentifier.getPortIdentifiers(); ArrayList<String> portNameList = new ArrayList<>(); //将可用串口名添加到List并返回该List while (portList.hasMoreElements()) { String portName = portList.nextElement().getName(); portNameList.add(portName); } return portNameList; } /** * 打开串口 * @param portName 端口名称 * @param baudrate 波特率 * @return 串口对象 * @throws SerialPortParameterFailure 设置串口参数失败 * @throws NotASerialPort 端口指向设备不是串口类型 * @throws NoSuchPort 没有该端口对应的串口设备 * @throws PortInUse 端口已被占用 */ public static final SerialPort openPort(String portName, int baudrate) throws SerialPortParameterFailure, NotASerialPort, NoSuchPort, PortInUse { try { //通过端口名识别端口 CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName); //打开端口，并给端口名字和一个timeout（打开操作的超时时间） CommPort commPort = portIdentifier.open(portName, 2000); //判断是不是串口 if (commPort instanceof SerialPort) { SerialPort serialPort = (SerialPort) commPort; try { //设置一下串口的波特率等参数 serialPort.setSerialPortParams(baudrate, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); } catch (UnsupportedCommOperationException e) { throw new SerialPortParameterFailure(); } System.out.println("Open " + portName + " sucessfully !"); return serialPort; } else { //不是串口 throw new NotASerialPort(); } } catch (NoSuchPortException e1) { throw new NoSuchPort(); } catch (PortInUseException e2) { throw new PortInUse(); } } /** * 关闭串口 * @param serialport 待关闭的串口对象 */ public static void closePort(SerialPort serialPort) { if (serialPort != null) { serialPort.close(); serialPort = null; } } /** * 往串口发送数据 * @param serialPort 串口对象 * @param order 待发送数据 * @throws SendDataToSerialPortFailure 向串口发送数据失败 * @throws SerialPortOutputStreamCloseFailure 关闭串口对象的输出流出错 * */ public static void sendToPort(SerialPort serialPort, byte[] order) throws SendDataToSerialPortFailure, SerialPortOutputStreamCloseFailure { OutputStream out = null; try { out = serialPort.getOutputStream(); out.write(order); out.flush(); } catch (IOException e) { throw new SendDataToSerialPortFailure(); } finally { try { if (out != null) { out.close(); out = null; } } catch (IOException e) { throw new SerialPortOutputStreamCloseFailure(); } } } /** * 从串口读取数据 * @param serialPort 当前已建立连接的SerialPort对象 * @return 读取到的数据 * @throws ReadDataFromSerialPortFailure 从串口读取数据时出错 * @throws SerialPortInputStreamCloseFailure 关闭串口对象输入流出错 */ public static byte[] readFromPort(SerialPort serialPort) throws ReadDataFromSerialPortFailure, SerialPortInputStreamCloseFailure { InputStream in = null; byte[] bytes = null; try { in = serialPort.getInputStream(); int bufflenth = in.available(); //获取buffer里的数据长度 while (bufflenth != 0) { bytes = new byte[bufflenth]; //初始化byte数组为buffer中数据的长度 in.read(bytes); bufflenth = in.available(); } } catch (IOException e) { throw new ReadDataFromSerialPortFailure(); } finally { try { if (in != null) { in.close(); in = null; } } catch(IOException e) { throw new SerialPortInputStreamCloseFailure(); } } return bytes; } /** * 添加监听器 * @param port 串口对象 * @param listener 串口监听器 * @throws TooManyListeners 监听类对象过多 */ public static void addListener(SerialPort port, SerialPortEventListener listener) throws TooManyListeners { try { //给串口添加监听器 port.addEventListener(listener); //设置当有数据到达时唤醒监听接收线程 port.notifyOnDataAvailable(true); //设置当通信中断时唤醒中断线程 port.notifyOnBreakInterrupt(true); } catch (TooManyListenersException e) { throw new TooManyListeners(); } } }