如何使用JButton下的java类？

Question

如何在jButton中使用java类？这是我想要与按钮链接的代码。此代码将发现蓝牙设备，并将发送一个文本文件到连接的设备。我用bluecove库。

import java.io.OutputStream; 
import java.util.ArrayList; 

import javax.bluetooth.DataElement; 
import javax.bluetooth.DeviceClass; 
import javax.bluetooth.DiscoveryAgent; 
import javax.bluetooth.DiscoveryListener; 
import javax.bluetooth.LocalDevice; 
import javax.bluetooth.RemoteDevice; 
import javax.bluetooth.ServiceRecord; 
import javax.bluetooth.UUID; 
import javax.microedition.io.Connector; 
import javax.obex.ClientSession; 
import javax.obex.HeaderSet; 
import javax.obex.Operation; 
import javax.obex.ResponseCodes; 


public class MyDiscoveryListener implements DiscoveryListener{ 

private static Object lock=new Object(); 
public ArrayList<RemoteDevice> devices; 

public MyDiscoveryListener() { 
    devices = new ArrayList<RemoteDevice>(); 
} 

public static void main(String[] args) { 

    MyDiscoveryListener listener = new MyDiscoveryListener(); 

    try{ 
     LocalDevice localDevice = LocalDevice.getLocalDevice(); 
     DiscoveryAgent agent = localDevice.getDiscoveryAgent(); 
     agent.startInquiry(DiscoveryAgent.GIAC, listener); 

     try { 
      synchronized(lock){ 
       lock.wait(); 
      } 
     } 
     catch (InterruptedException e) { 
      e.printStackTrace(); 
      return; 
     } 


     System.out.println("Device Inquiry Completed. "); 


     UUID[] uuidSet = new UUID[1]; 
     uuidSet[0]=new UUID(0x1105); //OBEX Object Push service 

     int[] attrIDs = new int[] { 
       0x0100 // Service name 
     }; 

     for (RemoteDevice device : listener.devices) { 
      agent.searchServices(
        attrIDs,uuidSet,device,listener); 


      try { 
       synchronized(lock){ 
        lock.wait(); 
       } 
      } 
      catch (InterruptedException e) { 
       e.printStackTrace(); 
       return; 
      } 


      System.out.println("Service search finished."); 
     } 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 



@Override 
public void deviceDiscovered(RemoteDevice btDevice, DeviceClass arg1) { 
    String name; 
    try { 
     name = btDevice.getFriendlyName(false); 
    } catch (Exception e) { 
     name = btDevice.getBluetoothAddress(); 
    } 

    devices.add(btDevice); 
    System.out.println("device found: " + name); 

} 

@Override 
public void inquiryCompleted(int arg0) { 
    synchronized(lock){ 
     lock.notify(); 
    } 
} 

@Override 
public void serviceSearchCompleted(int arg0, int arg1) { 
    synchronized (lock) { 
     lock.notify(); 
    } 
} 

@Override 
public void servicesDiscovered(int transID, ServiceRecord[] servRecord) { 
    for (int i = 0; i < servRecord.length; i++) { 
     String url = servRecord[i].getConnectionURL(ServiceRecord.AUTHENTICATE_NOENCRYPT, true); 
     if (url == null) { 
      continue; 
     } 
     DataElement serviceName = servRecord[i].getAttributeValue(0x0100); 
     if (serviceName != null) { 
      System.out.println("service " + serviceName.getValue() + " found " + url); 
      sendMessageToDevice(url); 
      if(serviceName.getValue().equals("OBEX Object Push")){ 
       sendMessageToDevice(url);     
      } 
     } else { 
      System.out.println("service found " + url); 
     } 


    } 
} 

private static void sendMessageToDevice(String serverURL){ 
    try{ 
     System.out.println("Connecting to " + serverURL); 

     ClientSession clientSession = (ClientSession) Connector.open(serverURL); 
     System.out.println(clientSession.toString()); 
     HeaderSet hsConnectReply = clientSession.connect(null); 
     System.out.println("Reply: " + hsConnectReply.toString()); 
     if (hsConnectReply.getResponseCode() != ResponseCodes.OBEX_HTTP_OK) { 
      System.out.println("Failed to connect"); 
      return; 
     } 

     HeaderSet hsOperation = clientSession.createHeaderSet(); 
     hsOperation.setHeader(HeaderSet.NAME, "do u want to encrypt/decrypt"); 
     hsOperation.setHeader(HeaderSet.TYPE, "text"); 

     System.out.println("Operation: " + hsOperation.toString()); 
     //Create PUT Operation 
     Operation putOperation = clientSession.put(hsOperation); 
     System.out.println("Putt Operation: " + putOperation.toString()); 
     // Send some text to server 
     byte data[] = "Hello World !!!".getBytes("iso-8859-1"); 
     hsOperation.setHeader(hsOperation.LENGTH, new Long(data.length)); 
     OutputStream os = putOperation.openOutputStream(); 
     System.out.println("Writing the data: " + data[0]); 
     os.write(data); 
     os.close(); 

     putOperation.close(); 

     clientSession.disconnect(null); 

     clientSession.close(); 
    } 
    catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

} 

Answer 1

你做在Java中没有链接。而是创建一个对象，该对象实现接口的动作侦听器。

直接在甲骨文像这样tutorial。一般来说：如果你对Java的知识真的很小 - 请在做其他任何事情之前先考虑学习这些bascis。特别是“UI”相关的Java编码不容易通过反复试验来学习。你应该退后一步，花大量时间学习/理解周围的概念！

Answer 2

如果你想创建一个从你的MyDiscoveryListener类执行功能按钮的Java应用程序（例如像调用searchForServices方法），你可以做这样的事情：

import javax.swing.*; 

public class BluetoothButton { 
    public static void main(String[] arguments) { 
     SwingUtilities.invokeLater(() -> new BluetoothButton().createAndShowGui()); 
    } 

    private void createAndShowGui() { 
     JFrame frame = new JFrame("Stack Overflow"); 
     frame.setBounds(100, 100, 800, 600); 
     frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 

     JButton button = new JButton("Search for services"); 

     button.addActionListener(actionEvent -> { 
      MyDiscoveryListener listener = new MyDiscoveryListener(); 
      listener.searchForServices(); 
     }); 

     frame.getContentPane().add(button); 

     frame.setVisible(true); 
    } 
}