我的 Java 经验很少,我似乎找不到任何可以向我解释如何解决我的问题的东西;几个小时以来,我一直在尝试不同的事情。
我正在使用 Phidgets RFID Java 库 (http://www.phidgets.com/programming_resources.php) 和 JLayer,目的是根据传感器范围内的 RFID 标签播放不同的 mp3 文件。一旦 RFID 标签不再在范围内,播放需要立即停止。
mp3类:
// Import the JLayer classes
import javazoom.jl.player.*;
// Import the Java classes
import java.io.*;
public class mp3 {
private Player player;
private InputStream is;
/** Creates a new instance of MP3Player */
public mp3()
{
//
}
public void play( String filename )
{
try
{
// Create an InputStream to the file
is = new FileInputStream( filename );
}
catch( Exception e )
{
e.printStackTrace();
}
try
{
player = new Player( is );
PlayerThread pt = new PlayerThread();
pt.start();
}
catch( Exception e )
{
e.printStackTrace();
}
}
public void stop()
{
player.close();
}
class PlayerThread extends Thread
{
public void run()
{
try
{
player.play();
}
catch( Exception e )
{
e.printStackTrace();
}
}
}
}
和其他一切发生的班级:
import com.phidgets.*;
import com.phidgets.event.*;
public class ParrotDJ
{
public static final void main(String args[]) throws Exception {
RFIDPhidget rfid;
mp3 song = new mp3();
System.out.println(Phidget.getLibraryVersion());
rfid = new RFIDPhidget();
rfid.addAttachListener(new AttachListener() {
public void attached(AttachEvent ae)
{
try
{
((RFIDPhidget)ae.getSource()).setAntennaOn(true);
((RFIDPhidget)ae.getSource()).setLEDOn(true);
}
catch (PhidgetException ex) { }
System.out.println("attachment of " + ae);
}
});
rfid.addDetachListener(new DetachListener() {
public void detached(DetachEvent ae) {
System.out.println("detachment of " + ae);
}
});
rfid.addErrorListener(new ErrorListener() {
public void error(ErrorEvent ee) {
System.out.println("error event for " + ee);
}
});
rfid.addTagGainListener(new TagGainListener()
{
public void tagGained(TagGainEvent oe)
{
//System.out.println(oe);
if(oe.getValue().equals("0107ee6ed5") || oe.getValue().equals("0107ee75d5"))
{
System.out.println("Amanda Palmer - Leeds United");
song.play("leedsunited.mp3");
}else if(oe.getValue().equals("0107ee82c7") || oe.getValue().equals("0107ee89f0"))
{
System.out.println("Paolo Nutini - 10/10");
song.play("1010.mp3");
}else if(oe.getValue().equals("0107ee8644") || oe.getValue().equals("0107ee6ff2"))
{
System.out.println("Mozart - Eine Kleine Nachtmusik");
song.play("einekleinenachtmusik.mp3");
}
}
});
rfid.addTagLossListener(new TagLossListener()
{
public void tagLost(TagLossEvent oe)
{
//System.out.println(oe);
System.out.println("Stop");
song.stop();
}
});
rfid.addOutputChangeListener(new OutputChangeListener()
{
public void outputChanged(OutputChangeEvent oe)
{
System.out.println(oe);
}
});
rfid.openAny();
System.out.println("waiting for RFID attachment...");
rfid.waitForAttachment(1000);
System.out.println("Serial: " + rfid.getSerialNumber());
System.out.println("Outputs: " + rfid.getOutputCount());
System.out.println("Outputting events. Input to stop.");
System.in.read();
System.out.print("closing...");
rfid.close();
rfid = null;
System.out.println(" ok");
if (false) {
System.out.println("wait for finalization...");
System.gc();
}
}
}
我想有一个合乎逻辑的解决方案,我只是在努力理解事件驱动的东西和 Java 的面向对象。我查找了构建器模式,但我现在无法掌握如何将其应用于这种情况。
提前致谢。