TestPanel.java package ClientPart;import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.io.*;import java.net.*; public class TestPanel extends JPanel implements ActionListener,Runnable{ private Socket connectToServer; private DataInputStream inFromServer; private DataOutputStream outToServer; private Thread thread;  private Timer testTimer; private int testTime;  private JButton startButton; private JLabel timeLabel; private JTextArea questionArea; private Checkbox radioButton[] = new Checkbox[4]; private CheckboxGroup buttonGroup = new CheckboxGroup(); private JButton answerButton; private JButton questionButton; private JButton scoreButton; public TestPanel(InetAddress add,int port){  initPanelGUI();  try{   connectToServer = new Socket(add,port);   inFromServer = new DataInputStream(     connectToServer.getInputStream());   outToServer = new DataOutputStream(     connectToServer.getOutputStream());   System.out.println(connectToServer.getInetAddress());        }  catch(IOException e){   System.out.println("TestPanel连接错误");   startButton.setEnabled(false);  }  testTimer = new Timer(1000,this);  thread = new Thread(this);  thread.start(); }  public void actionPerformed(ActionEvent e){  if(e.getSource()==startButton){   startButtonPerformed();  }  if(e.getSource()==testTimer){   testTimerPerformed();  }  if(e.getSource()==questionButton){   questionButtonPerformed();  }  if(e.getSource()==answerButton){   answerButtonPerformed();  }  if(e.getSource()==scoreButton){   scoreButtonPerformed();  }   } public void run(){  String inStr ="";  while(true){   try{    inStr = inFromServer.readUTF();    if(inStr.startsWith("考试时间")){     inStr = inStr.substring(inStr.indexOf("@")+1);     testTime = Integer.parseInt(inStr);     timeLabel.setText(convertTime(testTime));     testTimer.start();    }    if(inStr.startsWith("下一题")){     inStr = inStr.substring(inStr.indexOf("@")+1);     questionArea.setText(inStr);     if(inStr.startsWith("试题结束")){      testTimer.stop();      questionButton.setEnabled(false);      answerButton.setEnabled(false);      scoreButton.setEnabled(true);     }    }    if(inStr.startsWith("成绩")){     JOptionPane.showMessageDialog(null,inStr,"成绩显示",JOptionPane.INFORMATION_MESSAGE);     socketClosing();    }   }   catch(Exception e){    socketClosing();    questionArea.setText("服务器连接终止");    break;   }  } }  private void initPanelGUI(){  setLayout(new BorderLayout());  JPanel northPanel = new JPanel();  northPanel.setLayout(new GridLayout(2,1));  startButton = new JButton("开始考试");  startButton.addActionListener(this);  timeLabel = new JLabel("考试剩余时间");  northPanel.add(startButton);  northPanel.add(timeLabel);  add(northPanel,BorderLayout.NORTH);  questionArea = new JTextArea(30,10);  questionArea.setLineWrap(true);  questionArea.setFont(new Font("幼圆",Font.PLAIN,16));  int vScroll = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;  int hScroll = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;  add(new JScrollPane(questionArea,vScroll,hScroll),BorderLayout.CENTER);  JPanel southPanel = new JPanel();  JPanel radioPanel = new JPanel();  String s[] = {"A","B","C","D"};  for(int i=0;i<radioButton.length;i++){   radioButton[i] = new Checkbox(s[i],buttonGroup,false);   radioPanel.add(radioButton[i]);  }  answerButton = new JButton("提交答案");  answerButton.setEnabled(false);  answerButton.addActionListener(this);  questionButton = new JButton("下一题");  answerButton.setEnabled(false);  questionButton.addActionListener(this);  scoreButton = new JButton("成绩");  scoreButton.setEnabled(false);  scoreButton.addActionListener(this);  southPanel.add(radioPanel);  southPanel.add(answerButton);  southPanel.add(questionButton);  southPanel.add(scoreButton);  add(southPanel,BorderLayout.SOUTH); }  private String convertTime(int time){  int leftTime = time/1000;  int leftHour = leftTime/3600;  int leftMinute = (leftTime-leftHour*3600)/60;  int leftSecond = leftTime%60;  String timeStr = "剩余时间："+leftHour+"小时 "+leftMinute+"分 "+leftSecond+"秒 ";  return timeStr; }   public void startButtonPerformed(){  startButton.setEnabled(false);  questionButton.setEnabled(true);  try{   outToServer.writeUTF("开始考试");  }  catch(IOException ioe){   System.out.println("向服务器写\"开始考试\"失败");  } }  public void testTimerPerformed(){  testTime -= 1000;  timeLabel.setText(convertTime(testTime));  if(testTime<=0){   testTimer.stop();   questionButton.setEnabled(false);   answerButton.setEnabled(false);  } }   public void questionButtonPerformed(){  questionButton.setEnabled(false);  answerButton.setEnabled(true);  try{   outToServer.writeUTF("下一题");  }  catch(IOException ioe){   System.out.println("向服务器写\"下一题\"失败");  } } public void answerButtonPerformed(){  String answer = "";  questionButton.setEnabled(true);  answerButton.setEnabled(false);  for(int i = 0;i<radioButton.length;i++){   if(radioButton[i].getState()){    answer = radioButton[i].getLabel();    break;   }  }  try{   outToServer.writeUTF("提交答案@"+answer);  }  catch(IOException ioe){   System.out.println("向服务器\"提交答案\"失败");  } } public void scoreButtonPerformed(){  try{   scoreButton.setEnabled(false);   outToServer.writeUTF("成绩");  }  catch(IOException ioe){   System.out.println("要求服务器发送\"成绩\"失败");  } }  private void socketClosing(){  try{   inFromServer.close();   outToServer.close();   connectToServer.close();  }  catch(Exception e){   System.out.println("关闭socket异常！");  } } /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  } } ClientFrame.java package ClientPart;import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.net.*; public class ClientFrame extends JFrame { TestPanel myPanel;  public ClientFrame(String s){  super(s);  Container container = getContentPane();  try{   myPanel = new TestPanel(InetAddress.getLocalHost(),5500);  }  catch(UnknownHostException e){   System.out.println("找不到主机：");  }  container.add(myPanel,BorderLayout.CENTER);  setSize(400,200);  setVisible(true);  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); }   public static void main(String[] args) {  ClientFrame frame = new ClientFrame("C/S考试系统"); } }

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