BeatBox终极版——Head first java 650

服务端

import java.io.*;
import java.util.*;
import java.net.*;public class MusicServer {ArrayList<ObjectOutputStream> clientOutputStreams;public static void main(String[] args) {new MusicServer().go();}public class ClientHandler implements Runnable{Socket clientSocket;ObjectInputStream in;public ClientHandler(Socket s){try {clientSocket = s;in = new ObjectInputStream(clientSocket.getInputStream());  //getInputstream要抛出异常}catch(Exception ex){ex.printStackTrace();}}public void run(){Object o1 = null;Object o2 = null;try{while((o1 = in.readObject()) != null){//readObject存在异常o2 = in.readObject();System.out.println("read two objects");tellEveryone(o1,o2);}}catch(Exception ex){}}}//关闭内部类public void go(){clientOutputStreams = new ArrayList<ObjectOutputStream>();  //忘记new这个会导致抛出nullpoint异常try{ServerSocket serverSocket = new ServerSocket(5000); //监听4242端口（存在io异常）while(true) {Socket socket = serverSocket.accept(); //接受客户端的连接ObjectOutputStream os = new ObjectOutputStream(socket.getOutputStream()); //存在io异常clientOutputStreams.add(os);  //将客户端的输出流保存起来Thread t = new Thread(new ClientHandler(socket));t.start();}}catch(Exception ex){ex.printStackTrace();}}public void tellEveryone(Object o1,Object o2){//利用迭代器和集合向所有客户端发送信息Iterator it = clientOutputStreams.iterator();while(it.hasNext()){try{ObjectOutputStream out = (ObjectOutputStream)it.next();out.writeObject(o1);  //io异常out.writeObject(o2);  //io异常}catch(Exception ex){}}}
}

客户端

import java.awt.*;
import javax.swing.*;
import java.io.*;
import javax.sound.midi.*;
import java.util.*;
import java.awt.event.*;
import java.net.*;
import javax.swing.event.*;public class BeatBoxFinal {JFrame theFrame;JPanel mainPanel;JList incomingList;JTextField userMessage;ArrayList<JCheckBox> checkBoxList;  //存放256个勾选框int nextNum;Vector<String> listVector = new Vector<String>(); //动态数组存放读取到的音频的名字String userName;ObjectOutputStream out;ObjectInputStream in;HashMap<String, boolean[]> otherSeqsMap = new HashMap<String, boolean[]>(); //音频信息存储在map中根据key查询Sequencer sequencer;Sequence sequence;Sequence mySequence = null;Track track;String[] instrumentNames = {"Bass Drum", "Closed Hi-Hat", "Open Hi-Hat", "Acoustic Share", "Crash Cymbal", "Hand Clap", "High Tom", "Hi Bongo", "Maracas", "Whistle", "Low Conga", "Cowbell", "Vibraslap", "Low-mid Tom","High Agogo", "Open Hi Conga"};int[] instruments = {35, 42, 46, 38, 49, 39, 50, 60, 70, 72, 64, 56, 58, 47, 67, 63};public static void main(String[] args) {new BeatBoxFinal().startUp(args[0]);}public void startUp(String name) {userName = name;try {Socket socket = new Socket("127.0.0.1", 5000);out = new ObjectOutputStream(socket.getOutputStream());in = new ObjectInputStream(socket.getInputStream());Thread remote = new Thread(new RemoteReader());remote.start();} catch (Exception ex) {System.out.println("couldn't connect - you'll have to play alone");}setUpMidi();buildGui();}public void buildGui() {theFrame = new JFrame("Cyber BeatBox");theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);BorderLayout layout = new BorderLayout();JPanel background = new JPanel(layout);background.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10)); //格组件的间距checkBoxList = new ArrayList<JCheckBox>();Box buttonBox = new Box(BoxLayout.Y_AXIS);  //box布局的容器JButton start = new JButton("start");start.addActionListener(new MyStartListener());buttonBox.add(start);JButton stop = new JButton("Stop");stop.addActionListener(new MyStopListener());buttonBox.add(stop);JButton upTempo = new JButton("Tempo up");upTempo.addActionListener(new MyUpTempoListener());buttonBox.add(upTempo);JButton downTempo = new JButton("Tempo Down");downTempo.addActionListener(new MyDownTempoListener());buttonBox.add(downTempo);JButton sendIt = new JButton("sendIt");sendIt.addActionListener(new MySendListener());buttonBox.add(sendIt);userMessage = new JTextField();buttonBox.add(userMessage);//收到信息后的ListincomingList = new JList();incomingList.addListSelectionListener(new MyListSelectionListener());incomingList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); //限制用户只能选择一个JScrollPane theList = new JScrollPane(incomingList); //滚轮中有一个listbuttonBox.add(theList);incomingList.setListData(listVector); //从动态数组里获得信息Box nameBox = new Box(BoxLayout.Y_AXIS);for (int i = 0; i < 16; i++)nameBox.add(new Label(instrumentNames[i]));background.add(BorderLayout.EAST, buttonBox);background.add(BorderLayout.WEST, nameBox);theFrame.getContentPane().add(background);GridLayout grid = new GridLayout(16, 16); //16x16组件格局grid.setVgap(1); //组件竖直距离1grid.setHgap(2); //横距为2mainPanel = new JPanel(grid);background.add(BorderLayout.CENTER, mainPanel);for (int i = 0; i < 256; i++) {JCheckBox c = new JCheckBox();c.setSelected(false); //默认关闭checkBoxList.add(c);mainPanel.add(c);}theFrame.setBounds(50, 50, 300, 300);theFrame.pack();theFrame.setVisible(true);}public void setUpMidi() {try {sequencer = MidiSystem.getSequencer();sequencer.open();sequence = new Sequence(Sequence.PPQ, 4);track = sequence.createTrack();sequencer.setTempoInBPM(120);} catch (Exception ex) {ex.printStackTrace();}}public void buildTrackAndStart() {ArrayList<Integer> trackList = null;sequence.deleteTrack(track);track = sequence.createTrack(); //创造新的trackfor (int i = 0; i < 16; i++) {trackList = new ArrayList<Integer>();for (int j = 0; j < 16; j++) {JCheckBox jc = (JCheckBox) checkBoxList.get(i + j * 16);if (jc.isSelected()) {int key = instruments[i];trackList.add(key);} else {trackList.add(null);}}makeTracks(trackList);}track.add(makeEvent(192, 9, 1, 0, 15));try {sequencer.setSequence(sequence);sequencer.setLoopCount(sequencer.LOOP_CONTINUOUSLY);sequencer.start();sequencer.setTempoInBPM(120);} catch (Exception ex) {ex.printStackTrace();}}public void makeTracks(ArrayList list){Iterator it = list.iterator();for(int i=0;i<16;i++){Integer num = (Integer)it.next();if(num != null){int numKey = num.intValue();track.add(makeEvent(144,9,numKey,100,i));track.add(makeEvent(128,9,numKey,100,i+1));}}}public MidiEvent makeEvent(int comd,int chan,int one,int two,int tick){MidiEvent event = null;try{ShortMessage a = new ShortMessage();a.setMessage(comd,chan,one,two);event = new MidiEvent(a,tick);}catch(Exception ex){ex.printStackTrace();}return event;}class MyStartListener implements ActionListener{public void actionPerformed(ActionEvent a){buildTrackAndStart();}}class MyStopListener implements ActionListener{public void actionPerformed(ActionEvent a){sequencer.stop();}}class MyUpTempoListener implements ActionListener{public void actionPerformed(ActionEvent event){float tempoFactor = sequencer.getTempoFactor();sequencer.setTempoFactor((float)(tempoFactor*1.03));}}class MyDownTempoListener implements ActionListener{public void actionPerformed(ActionEvent event){float tempoFactor = sequencer.getTempoFactor();sequencer.setTempoFactor((float)(tempoFactor*0.97));}}class MySendListener implements ActionListener{public void actionPerformed(ActionEvent event){boolean[] checkboxState = new boolean[256];for(int i=0;i<256;i++){JCheckBox check = (JCheckBox)checkBoxList.get(i);if(check.isSelected())checkboxState[i] = true;elsecheckboxState[i] = false;}String messageToSend = null;try{out.writeObject(userName+nextNum+":"+userMessage.getText());out.writeObject(checkboxState);}catch(Exception ex){System.out.println("Sorry dude.Could not send it to the server.");}userMessage.setText("");}}class MyListSelectionListener implements ListSelectionListener{public void valueChanged(ListSelectionEvent le){if(!le.getValueIsAdjusting()){//为了不得到两次事件String selected = (String)incomingList.getSelectedValue();if(selected != null){boolean[] selectedState = (boolean[])otherSeqsMap.get(selected);//根据key在map中寻到信息changeSequence(selectedState);sequencer.stop();buildTrackAndStart();}}}}//多线程随时接受服务器发来的信息class RemoteReader implements Runnable{boolean[] checkBoxState = null;String nameToShow = null;Object obj = null;public void run(){try {while ((obj = in.readObject()) != null) {System.out.println("got an object from server");System.out.println(obj.getClass());nameToShow = (String) obj;checkBoxState = (boolean[]) in.readObject();otherSeqsMap.put(nameToShow, checkBoxState); //放入map存储listVector.add(nameToShow); //把key加入动态数组incomingList.setListData(listVector); //重新设置list}}catch(Exception ex){}}}class MyPlayMineListener implements ActionListener{public void actionPerformed(ActionEvent event){if(mySequence != null)sequence = mySequence;}}public void changeSequence(boolean[] checkboxState){for(int i=0;i<256;i++){JCheckBox checkBox = (JCheckBox)checkBoxList.get(i);if(checkboxState[i])checkBox.setSelected(true);elsecheckBox.setSelected(false);}}}

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