Java 我需要帮助,我为什么得到NPE和如何停止剪辑时,它正在播放
嗨,我在拼命寻找一个解决方案,当我的剪辑已经运行时,我该如何停止我的剪辑。我已经寻找了多少天的解决方案,但我仍然找不到。请任何知道如何帮助我的人 这是我的密码Java 我需要帮助,我为什么得到NPE和如何停止剪辑时,它正在播放,java,audio,javasound,java-server,Java,Audio,Javasound,Java Server,嗨,我在拼命寻找一个解决方案,当我的剪辑已经运行时,我该如何停止我的剪辑。我已经寻找了多少天的解决方案,但我仍然找不到。请任何知道如何帮助我的人 这是我的密码 import java.io.BufferedReader; import java.io.File; import java.io.IOException; import java.io.InputStreamReader; import java.net.InetAddress; import java.net.ServerSocke
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
import javazoom.jl.player.Player;
public class server
{
private static final int PORT = 7777;
private static ServerSocket serverSocket;
private static Socket clientSocket;
private static InputStreamReader inputStreamReader;
private static BufferedReader bufferedReader;
private static String message;
@SuppressWarnings("unused")
private String filename;
private static Clip clip1;
private static Clip clip2;
private static Clip clip3;
private static Clip clip4;
private static Clip clip5;
private static Clip clip6;
static Player player;
public server(String filename) {
this.filename = filename;
}
public static void main(String[] args) throws Exception
{
try
{
serverSocket = new ServerSocket(PORT, 0, InetAddress.getLocalHost());
System.out.println("IP: " + serverSocket.getInetAddress() + " Port: " + serverSocket.getLocalPort());
} catch (IOException e)
{
System.out.println("Could not listen on port: 7777");
}
System.out.println("Server started. Listening to the port 7777");
while (true)
{
try
{
clientSocket = serverSocket.accept();
inputStreamReader = new InputStreamReader(clientSocket.getInputStream());
bufferedReader = new BufferedReader(inputStreamReader);
message = bufferedReader.readLine();
System.out.println(message);{
clip1 = null;
clip2 = null;
clip3 = null;
clip4 = null;
clip5 = null;
clip6 = null;
if (message.equals("rock1")) {
AudioInputStream inputStream = AudioSystem.getAudioInputStream(new File("D:/Andrd/Music/TheAll-AmericanRejects-Swing,Swing.wav"));
clip4 = AudioSystem.getClip();
clip4.open(inputStream);
clip4.start();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JOptionPane.showMessageDialog(null, "rock1 song is playing!");
}
});
} else if (message.equals("stop") && clip4 != null && clip4.isRunning()){
clip4.stop();
}
if(message.equals("rock2")) {
AudioInputStream inputStream = AudioSystem.getAudioInputStream(new File("D:/Andrd/Music/FallOutBoy-SugarWe'reGoingDownWithLyrics!HQ.wav"));
clip5 = AudioSystem.getClip();
clip5.open(inputStream);
clip5.start();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JOptionPane.showMessageDialog(null, "rock2 song is playing!");
}
});
} else if(message.equals("stop") && clip5 != null && clip5.isRunning()) {
clip5.stop();
}
if(message.equals("rock3")) {
AudioInputStream inputStream = AudioSystem.getAudioInputStream(new File("D:/Andrd/Music/Fall Out Boy Light Em Up Lyrics.wav"));
clip6 = AudioSystem.getClip();
clip6.open(inputStream);
clip6.start();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JOptionPane.showMessageDialog(null, "rock3 song is playing!");
}
});
} else if(message.equals("stop") && clip6 !=null && clip6.isRunning()){
clip6.stop();
}
if(message.equals("punk1")){
AudioInputStream inputStream = AudioSystem.getAudioInputStream(new File("D:/Andrd/Music/athousandmiles.wav"));
clip1 = AudioSystem.getClip();
clip1.open(inputStream);
clip1.start();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JOptionPane.showMessageDialog(null, "punk1 song is playing!");
}
});
} else if(message.equals("stop") && clip1 !=null && clip1.isRunning()){
clip1.stop();
}
if(message.equals("punk2")){
AudioInputStream inputStream = AudioSystem.getAudioInputStream(new File("D:/Andrd/Music/ISSUES - Boyfriend Lyric Video (Punk Goes Pop 5).wav"));
clip2 = AudioSystem.getClip();
clip2.open(inputStream);
clip2.start();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JOptionPane.showMessageDialog(null, "punk2 song is playing!");
}
});
} else if(message.equals("stop") && clip2 !=null && clip2.isRunning()){
clip2.stop();
}
if(message.equals("punk3")){
AudioInputStream inputStream = AudioSystem.getAudioInputStream(new File("D:/Andrd/Music/My Chemical Romance - Famous Last Words (Lyrics) - GetThemLyrics.wav"));
clip2 = AudioSystem.getClip();
clip2.open(inputStream);
clip2.start();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JOptionPane.showMessageDialog(null, "punk3 song is playing!");
}
});
} else if(message.equals("stop") && clip3 !=null && clip3.isRunning()){
clip3.stop();
}
}
inputStreamReader.close();
clientSocket.close();
}catch (IOException ex)
{
System.out.println("Problem in message reading");
}
}
}
}
问题是歌曲在收到“停止”消息时没有停止
当它收到像“rock2”这样的另一条消息时,即使有一首歌已经在播放,它也会播放它。请帮我修一下这个程序
这是我的java stacktrace控制台:
Exception in thread "main" java.lang.NullPointerException
at server.main(server.java:73)
它可以同时播放所有3首歌曲,但无法停止。当我尝试发送2条相同的消息时,服务器崩溃并显示上述错误。菲尔的上述评论是正确的 如果要避免出现
空点异常,通常编写“stop”.equals(message)
比message.equals(“stop”)
更安全
此外,您似乎从未检查消息的有效性readLine()
返回null
,如果没有更多输入,即对方刚刚挂断。在这种情况下,您可能需要等待下一个请求
[...]
message = bufferedReader.readLine();
// the following line may solve the issue:
if (message == null) continue;
干杯。请发布stacktrace。我们不是通灵者。连续17行空白。。。很抱歉,我把它贴了哪一行是第73行?还是要我们数出73行?你是说这行吗?“if(message.equals(“rock1”){”如果是,你的消息变量是空的,问题可能是读取消息时没有停止剪辑。但是如果你能播放所有三个剪辑,那就不行了,所以我不知道。顺便说一句,括号对我来说很混乱。我不愿意在必须数括号的时候努力诊断。