使用J2ME搜索蓝牙设备，并与搜到的设备通信

本文来自http://blog.csdn.net/hellogv/       

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 由于代码来自我目前的项目，所以不能给出完整代码(非常多)，只给出关键代码，对于一般J2ME程序员绝对看得懂！
        首先，给出J2ME搜索蓝牙设备的代码：      public void commandAction(Command command, Displayable displayable) { if(command==cmd_Search) { try { LocalDevice localDevice = LocalDevice.getLocalDevice(); DiscoveryAgent discoveryAgent = localDevice.getDiscoveryAgent(); discoveryAgent.startInquiry(DiscoveryAgent.GIAC,new MyDiscoveryListener(this)); } catch (Exception e) { MyClass.MessageBox("搜索出错,找不到蓝牙设备！", display); return; } Menu.removeCommand(cmd_Search); } } } class MyDiscoveryListener implements DiscoveryListener { //用于保存搜索到的设备 Vector devices = new Vector(); SearchDevices midlet; public MyDiscoveryListener(SearchDevices midlet) { this.midlet = midlet; } public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod) { devices.addElement(btDevice); } public void inquiryCompleted(int discType) { for (int i=0;i<devices.size();i++) { RemoteDevice btDevice = (RemoteDevice)devices.elementAt(i); try { String device_address=btDevice.getBluetoothAddress();//取得蓝牙设备的全球唯一地址 } catch (Exception e) {e.printStackTrace();} } } public void servicesDiscovered(int transID, ServiceRecord[] servRecord) {} public void serviceSearchCompleted(int transID, int responseCode) {} } 接下来就是根据搜索所得的蓝牙设备地址来连接设备，并与设备通信： import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import javax.bluetooth.ServiceRecord; import javax.microedition.io.Connector; import javax.microedition.io.StreamConnection; import javax.microedition.lcdui.Command; import javax.microedition.lcdui.CommandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; import javax.microedition.midlet.MIDletStateChangeException; public class MIDlet_ConnDevice extends MIDlet implements Runnable, CommandListener { private Display display = null; private Form form = new Form("蓝牙 "); //用于输入要发送的消息 private TextField tfData = new TextField("请输入发送的消息", "",255,TextField.ANY); private Command cmdExit = new Command("退出", Command.EXIT, 0); private Command cmdSend = new Command("发送", Command.SCREEN, 1); private Command cmdConnect = new Command("连接", Command.SCREEN, 1); //线程运行标志 private boolean isRunning = true; StreamConnection client = null; //服务器服务记录 ServiceRecord record=null; private DataInputStream dis = null; private DataOutputStream dos = null; public MIDlet_ConnDevice() { super(); form.append(tfData); form.addCommand(cmdExit); form.addCommand(cmdConnect); form.setCommandListener(this); } protected void startApp() throws MIDletStateChangeException { display = Display.getDisplay(this); display.setCurrent(form); } protected void pauseApp() { isRunning = false; close(); } protected void destroyApp(boolean arg0) throws MIDletStateChangeException { isRunning = false; close(); } /** * 处理命令按钮事件 */ public void commandAction(Command cmd, Displayable d) { if (cmd == cmdExit) { isRunning = false; notifyDestroyed(); } else if(cmd == cmdSend) { //发送数据 new Thread() { public void run() { if (dos == null) { return; } //把输入的字符串变为数字 try { dos.writeUTF(tfData.getString()); dos.flush(); } catch (IOException e) { form.append("Send error"); } } }.start(); } else if (cmd == cmdConnect) { //开始服务器线程 new Thread(this).start(); } } /** * 客户端接收线程 */ public void run() { isRunning = true; client = null; String device_address;//搜索所得的设备地址 String conURL = "btspp://"+device_address+":1"; try { client = (StreamConnection)Connector.open(conURL); form.append("Connected!/n"); dis = client.openDataInputStream(); dos = client.openDataOutputStream(); form.removeCommand(cmdConnect); form.addCommand(cmdSend); } catch (Exception e) { form.append("connect error"); close(); return; } while(isRunning) { try { if(dis.available()>1) { byte[] rec_package=new byte[dis.available()];//强烈建议这里使用byte[] dis.read(rec_package); String str=new String(rec_package); } } catch (Exception e) { form.append("rec error"); break; } } close(); form.removeCommand(cmdSend); form.addCommand(cmdConnect); } /** * 关闭连接 */ public void close() { try { if (dis != null) { dis.close(); dis = null; } if (dos != null) { dos.close(); dos = null; } if (client != null) { client.close(); client = null; } } catch (Exception e) { e.printStackTrace(); } } }