实验2 字体对话框
1．答案：
【代码1】：setModal(true);
【代码2】：setVisible(false);
【代码3】：setVisible(false);
【代码4】：new FontDialog(this);
【代码5】：setVisible(true);
【代码6】：dialog.setTitle("字体对话框");
2．模板代码
FontFamilyNames.java
import java.awt.GraphicsEnvironment;
public class FontFamilyNames
{ String fontName[];
public String [] getFontName()
{ GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
fontName=ge.getAvailableFontFamilyNames();
return fontName;
}
}
FontDialog.java
import java.awt.event.*;
import java.awt.*;
import javax.swing.JLabel;
public class FontDialog extends Dialog implements ItemListener,ActionListener
{ FontFamilyNames fontFamilyNames;
int fontSize=38;
String fontName;
Choice fontNameList;
JLabel label;
Font font;
Button yes,cancel;
static int YES=1,NO=0;
int state=-1;
FontDialog(Frame f)
{ super(f);
fontFamilyNames=new FontFamilyNames();
【代码1】 //对话框设置为有模式
yes=new Button("Yes");
cancel=new Button("cancel");
yes.addActionListener(this);
cancel.addActionListener(this);
label=new JLabel("hello,奥运",JLabel.CENTER);
fontNameList=new Choice();
String name[]=fontFamilyNames.getFontName();
for(int k=0;k<name.length;k++)
{ fontNameList.add(name[k]);
}
fontNameList.addItemListener(this);
add(fontNameList,BorderLayout.NORTH);
add(label,BorderLayout.CENTER);
Panel pSouth=new Panel();
pSouth.add(yes);
pSouth.add(cancel);
add(pSouth,BorderLayout.SOUTH);
setBounds(100,100,280,170);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ state=NO;
setVisible(false);
}
}
);
validate();
}
public void itemStateChanged(ItemEvent e)
{ fontName=(String)fontNameList.getSelectedItem();
font=new Font(fontName,Font.BOLD,fontSize);
label.setFont(font);
label.repaint();
validate();
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==yes)
{ state=YES;
【代码2】 //对话框设置为不可见
}
else if(e.getSource()==cancel)
{ state=NO;
【代码3】 //对话框设置为不可见
}
}
public int getState()
{ return state;
}
public Font getFont()
{ return font;
}
}
FrameHaveDialog.java
import java.awt.event.*;
import java.awt.*;
import javax.swing.JTextArea;
public class FrameHaveDialog extends Frame implements ActionListener
{ JTextArea text;
Button buttonFont;
FrameHaveDialog()
{ buttonFont=new Button("设置字体");
text=new JTextArea("Java 2实用教程（第三版）");
buttonFont.addActionListener(this);
add(buttonFont,BorderLayout.NORTH);
add(text);
setBounds(60,60,300,300);
setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==buttonFont)
{ FontDialog dialog=【代码4】 //创建对话框
【代码5】 //对话框设置为可见
【代码6】 //对话框设置设置标题为“字体对话框”
if(dialog.getState()==FontDialog.YES)
{ text.setFont(dialog.getFont());
text.repaint();
}
if(dialog.getState()==FontDialog.NO)
{ text.repaint();
}
}
}
}
FontDialogMainClass.java
public class FontDialogMainClass
{ public static void main(String args[])
{ new FrameHaveDialog();
}
}
实验3 英语单词拼写训练
1．答案：
【代码1】：addFocusListener(this);
【代码2】：addMouseListener(this);
【代码3】：label[k].addKeyListener(this);
【代码4】：e.getKeyCode()==KeyEvent.VK_LEFT
【代码5】：e.getKeyCode()==KeyEvent.VK_RIGHT
2．模板代码
RondomString.java
public class RondomString
{ String str="";
public String getRondomString(String s)
{ StringBuffer strBuffer=new StringBuffer(s);
int m=strBuffer.length();
for(int k=0;k<m;k++)
{ int index=(int)(Math.random()*strBuffer.length());
char c=strBuffer.charAt(index);
str=str+c;
strBuffer=strBuffer.deleteCharAt(index);
}
return str;
}
}
LetterLabel.java
import java.awt.*;
import java.awt.event.*;
public class LetterLabel extends Button implements FocusListener,MouseListener
{ LetterLabel()
{ 【代码1】 //将当前对象注册为自身的焦点视器
【代码2】 //将当前对象注册为自身的标监视器
setBackground(Color.cyan);
setFont(new Font("",Font.BOLD,30));
}
public static LetterLabel[] getLetterLabel(int n)
{ LetterLabel a[]=new LetterLabel[n];
for(int k=0;k<a.length;k++)
{ a[k]=new LetterLabel();
}
return a;
}
public void focusGained(FocusEvent e)
{ setBackground(Color.red);
}
public void focusLost(FocusEvent e)
{ setBackground(Color.cyan);
}
public void mousePressed(MouseEvent e)
{ requestFocus();
}
public void setText(char c)
{ setLabel(""+c);
}
public void mouseReleased(MouseEvent e){}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseClicked(MouseEvent e){}
}
SpellingWordFrame.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.Box;
public class SpellingWordFrame extends Frame implements KeyListener,ActionListener
{ TextField inputWord;
Button button;
LetterLabel label[];
Panel northP,centerP;
Box wordBox;
String hintMessage="用鼠标单击字母，按左右箭头交换字母，将其排列成所输入的单词";
Label messaageLabel=new Label(hintMessage);
String word="";
SpellingWordFrame()
{ inputWord=new TextField(12);
button=new Button("确定");
button.addActionListener(this);
inputWord.addActionListener(this);
northP=new Panel();
northP.add(new Label("输入一个英文单词："));
northP.add(inputWord);
northP.add(button);
centerP=new Panel();
wordBox=Box.createHorizontalBox();
centerP.add(wordBox);
add(northP,BorderLayout.NORTH);
add(centerP,BorderLayout.CENTER);
add(messaageLabel,BorderLayout.SOUTH);
setBounds(100,100,350,180);
setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
);
}
public void actionPerformed(ActionEvent e)
{ word=inputWord.getText();
int n=word.length();
RondomString rondom=new RondomString();
String randomWord=rondom.getRondomString(word);
wordBox.removeAll();
messaageLabel.setText(hintMessage);
if(n>0)
{ label=LetterLabel.getLetterLabel(n);
for(int k=0;k<label.length;k++)
{ 【代码3】 //将当前窗口注册为label[k]的键盘监视器
label[k].setText(""+randomWord.charAt(k));
wordBox.add(label[k]);
}
validate();
inputWord.setText(null);
label[0].requestFocus();
}
}
public void keyPressed(KeyEvent e)
{ LetterLabel sourceLabel=(LetterLabel)e.getSource();
int index=-1;
if(【代码4】) //判断按下的是否是←键)
{ for(int k=0;k<label.length;k++)
{ if(label[k]==sourceLabel)
{ index=k;
break;
}
}
if(index!=0)
{ String temp=label[index].getText();
label[index].setText(label[index-1].getText());
label[index-1].setText(temp);
label[index-1].requestFocus();
}
}
else if(【代码5】) //判断按下的是否是→键
{ for(int k=0;k<label.length;k++)
{ if(label[k]==sourceLabel)
{ index=k;
break;
}
}
if(index!=label.length-1)
{ String temp=label[index].getText();
label[index].setText(label[index+1].getText());
label[index+1].setText(temp);
label[index+1].requestFocus();
}
}
validate();
}
public void keyTyped(KeyEvent e){}
public void keyReleased(KeyEvent e)
{ String success="";
for(int k=0;k<label.length;k++)
{ String str=label[k].getText();
success=success+str;
}
if(success.equals(word))
{ messaageLabel.setText("恭喜你，你成功了");
for(int k=0;k<label.length;k++)
{ label[k].removeKeyListener(this);
label[k].removeFocusListener(label[k]);
label[k].setBackground(Color.green);
}
inputWord.requestFocus();
}
}
}
WordMainClass.java
public class WordMainClass
{ public static void main(String args[])
{ new SpellingWordFrame();
}
}
上机实践8多线程
实验1 汉字打字练习
1．答案：
【代码1】：sleep(6000);
【代码2】：WordThread giveWord;
【代码3】：giveWord=new WordThread(wordLabel);
【代码4】：giveWord.isAlive()
【代码5】：giveWord.start();
2．模板代码
WordThread.java
import java.awt.*;
public class WordThread extends Thread
{ char word;
int k=19968;
Label com;
WordThread(Label com)
{ this.com=com;
}
public void run()
{ k=19968;
while(true)
{
word=(char)k;
com.setText(""+word);
try{ 【代码1】//调用sleep方法使得线程中断6000豪秒
}
catch(InterruptedException e){}
k++;
if(k>=29968) k=19968;
}
}
}
ThreadFrame.java
import java.awt.*;
import java.awt.event.*;
public class ThreadFrame extends Frame implements ActionListener
{
Label wordLabel;
Button button;
TextField inputText,scoreText;
【代码2】//用WordThread声明一个giveWord对象
int score=0;
ThreadFrame()
{ wordLabel=new Label(" ",Label.CENTER);
wordLabel.setFont(new Font("",Font.BOLD,72));
button=new Button("开始");
inputText=new TextField(3);
scoreText=new TextField(5);
scoreText.setEditable(false);
【代码3】//创建giveWord，将wordLabel传递给WordThread构造方法的参数
button.addActionListener(this);
inputText.addActionListener(this);
add(button,BorderLayout.NORTH);
add(wordLabel,BorderLayout.CENTER);
Panel southP=new Panel();
southP.add(new Label("输入标签所显示的汉字后回车:"));
southP.add(inputText);
southP.add(scoreText);
add(southP,BorderLayout.SOUTH);
setBounds(100,100,350,180);
setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==button)
{ if(!(【代码4】)) //giveWord调用方法isAlive()
{ giveWord=new WordThread(wordLabel);
}
try
{ 【代码5】//giveWord调用方法start()
}
catch(Exception exe){}
}
else if(e.getSource()==inputText)
{ if(inputText.getText().equals(wordLabel.getText()))
{ score++;
}
scoreText.setText("得分:"+score);
inputText.setText(null);
}
}
}
WordThread.java
public class ThreadWordMainClass
{ public static void main(String args[])
{ new ThreadFrame();
}
实验2 旋转的行星
1．答案：
【代码1】：Thread moon;
【代码2】：thread=new Thread(this);
【代码3】：Thread.sleep(10);
【代码4】：Thread rotate;
【代码5】：rotate.start();
2．模板代码
Mycanvas.java
import java.awt.*;
public class Mycanvas extends Canvas
{ int r;
Color c;
public void setColor(Color c)
{ this.c=c;
}
public void setR(int r)
{ this.r=r;
}
public void paint(Graphics g)
{ g.setColor(c);
g.fillOval(0,0,2*r,2*r);
}
public int getR()
{ return r;
}
}
Planet.java
import java.awt.*;
public class Planet extends Panel implements Runnable
{ 【代码1】 //用Thread类声明一个moon对象
Mycanvas yellowBall;
double pointX[]=new double[360],
pointY[]=new double[360]; //用来表示画布左上角端点坐标的数组
int w=100,h=100;
int radius=30;
Planet()
{ setSize(w,h);
setLayout(null);
yellowBall=new Mycanvas();
yellowBall.setColor(Color.yellow);
add(yellowBall);
yellowBall.setSize(12,12);
yellowBall.setR(12/2);
pointX[0]=0;
pointY[0]=-radius;
double angle=1*Math.PI/180; //刻度为1度
for(int i=0;i<359;i++) //计算出数组中各个元素的值
{ pointX[i+1]=pointX[i]*Math.cos(angle)-Math.sin(angle)*pointY[i];
pointY[i+1]=pointY[i]*Math.cos(angle)+pointX[i]*Math.sin(angle);
}
for(int i=0;i<360;i++)
{ pointX[i]=pointX[i]+w/2; //坐标平移
pointY[i]=pointY[i]+h/2;
}
yellowBall.setLocation((int)pointX[0]-yellowBall.getR(),
(int)pointY[0]-yellowBall.getR());
【代码2】 //创建 moon线程，当前面板做为该线程的目标对象
}
public void start()
{ try{ moon .start();
}
catch(Exception exe){}
}
public void paint(Graphics g)
{ g.setColor(Color.blue);
g.fillOval(w/2-9,h/2-9,18,18);
}
public void run()
{ int i=0;
while(true)
{ i=(i+1)%360;
yellowBall.setLocation((int)pointX[i]-yellowBall.getR(),
(int)pointY[i]-yellowBall.getR());
try{ 【代码3】 // Thread类调用类方法sleep使得线程中断10豪秒
}
catch(InterruptedException e){}
}
}
}
HaveThreadFrame.java
import java.awt.*;
import java.awt.event.*;
public class HaveThreadFrame extends Frame implements Runnable
{ 【代码4】 //用Thread类声明一个rotate对象
Planet earth;
double pointX[]=new double[360],
pointY[]=new double[360];
int width,height;
int radius=120;
HaveThreadFrame()
{ rotate=new Thread(this);
earth=new Planet();
setBounds(0,0,360,400);
width=getBounds().width;
height=getBounds().height;
pointX[0]=0;
pointY[0]=-radius;
double angle=1*Math.PI/180;
for(int i=0;i<359;i++)
{ pointX[i+1]=pointX[i]*Math.cos(angle)-Math.sin(angle)*pointY[i];
pointY[i+1]=pointY[i]*Math.cos(angle)+pointX[i]*Math.sin(angle);
}
for(int i=0;i<360;i++)
{ pointX[i]=pointX[i]+width/2;
pointY[i]=pointY[i]+height/2;
}
setLayout(null);
setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
);
add(earth);
earth.setLocation((int)pointX[0]-earth.getSize().width/2,
(int)pointY[0]-earth.getSize().height/2);
earth.start();
【代码5】 //用rotate调用start方法
}
public void run()
{ int i=0;
while(true)
{ i=(i+1)%360;
earth.setLocation((int)pointX[i]-earth.getSize().width/2,
(int)pointY[i]-earth.getSize().height/2);
try{ Thread.sleep(100);
}
catch(InterruptedException e){}
}
}
public void paint(Graphics g)
{ g.setColor(Color.red);
g.fillOval(width/2-15,height/2-15,30,30);
}
}
HaveThreadFrame.java
public class ThreadRotateMainClass
{ public static void main(String args[])
{ new HaveThreadFrame();
}
}
实验3 双线程接力
1．答案：
【代码1】：Thread first,second;
【代码2】：first=new Thread(this);
【代码3】：second=new Thread(this);
【代码4】：Thread.currentThread()==first
【代码5】：Thread.currentThread()==second
2．模板代码
MoveButton.java
import java.awt.*;
import java.awt.event.*;
public class MoveButton extends Frame implements Runnable,ActionListener
{ 【代码1】//用Thread类声明first,second两个线程对象
Button redButton,greenButton,startButton;
int distance=10;
MoveButton()
{ 【代码2】 //创建first线程，当前窗口做为该线程的目标对象
【代码3】 //创建first线程，当前窗口做为该线程的目标对象
redButton=new Button();
greenButton=new Button();
redButton.setBackground(Color.red);
greenButton.setBackground(Color.green);
startButton=new Button("start");
startButton.addActionListener(this);
setLayout(null);
add(redButton);
redButton.setBounds(10,60,15,15);
add(greenButton);
greenButton.setBounds(100,60,15,15);
add(startButton);
startButton.setBounds(10,100,30,30);
setBounds(0,0,300,200);
setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
);
}
public void actionPerformed(ActionEvent e)
{ try{ first.start();
second.start();
}
catch(Exception exp){}
}
public void run()
{ while(true)
{ if(【代码4】) //判断当前占有CPU资源的线程是否是first
{ moveComponent(redButton);
try{ Thread.sleep(20);
}
catch(Exception exp){}
}
if(【代码5】) //判断当前占有CPU资源的线程是否是second
{ moveComponent(greenButton);
try{ Thread.sleep(10);
}
catch(Exception exp){}
}
}
}
public synchronized void moveComponent(Component b)
{
if(Thread.currentThread()==first)
{ while(distance>100&&distance<=200)
try{ wait();
}
catch(Exception exp){}
distance=distance+1;
b.setLocation(distance,60);
if(distance>=100)
{ b.setLocation(10,60);
notifyAll();
}
}
if(Thread.currentThread()==second)
{ while(distance>=10&&distance<100)
try{ wait();
}
catch(Exception exp){}
distance=distance+1;
b.setLocation(distance,60);
if(distance>200)
{ distance=10;
b.setLocation(100,60);
notifyAll();
}
}
}
}
MoveButtonMainClass.java
public class MoveButtonMainClass
{ public static void main(String args[])
{ new MoveButton();
}
上机实践9输入输出流
实验1 学读汉字
1．答案：
【代码1】：new FileReader(file);
【代码2】：new BufferedReader(inOne);
【代码3】：inTwo.readLine();
【代码4】：new FileReader(helpFile);
【代码5】：new BufferedReader(inOne);
2．模板代码
ChineseCharacters.java
import java.io.*;
import java.util.StringTokenizer;
public class ChineseCharacters
{ public StringBuffer getChinesecharacters(File file)
{ StringBuffer hanzi=new StringBuffer();
try{ FileReader inOne=【代码1】 //创建指向文件f的inOne 的对象
BufferedReader inTwo=【代码2】 //创建指向文件inOne的inTwo 的对象
String s=null;
int i=0;
while((s=【代码3】)!=null) //inTwo读取一行
{ StringTokenizer tokenizer=new StringTokenizer(s," ,'\n' ");
while(tokenizer.hasMoreTokens())
{ hanzi.append(tokenizer.nextToken());
}
}
}
catch(Exception e) {}
return hanzi;
}
}
StudyFrame.java
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.sound.sampled.*;
public class StudyFrame extends Frame implements ItemListener,ActionListener,Runnable
{ ChineseCharacters chinese;
Choice choice;
Button getCharacters,voiceCharacters;
Label showCharacters;
StringBuffer trainedChinese=null;
Clip clip=null;
Thread voiceThread;
int k=0;
Panel pCenter;
CardLayout mycard;
TextArea textHelp;
MenuBar menubar;
Menu menu;
MenuItem help;
public StudyFrame()
{ chinese=new ChineseCharacters();
choice=new Choice();
choice.add("training1.txt");
choice.add("training2.txt");
choice.add("training3.txt");
showCharacters=new Label("",Label.CENTER);
showCharacters.setFont(new Font("宋体",Font.BOLD,72));
showCharacters.setBackground(Color.green);
getCharacters=new Button("下一个汉字");
voiceCharacters=new Button("发音");
voiceThread=new Thread(this);
choice.addItemListener(this);
voiceCharacters.addActionListener(this);
getCharacters.addActionListener(this);
Panel pNorth=new Panel();
pNorth.add(new Label("选择一个汉字字符组成的文件"));
pNorth.add(choice);
add(pNorth,BorderLayout.NORTH);
Panel pSouth=new Panel();
pSouth.add(getCharacters);
pSouth.add(voiceCharacters);
add(pSouth,BorderLayout.SOUTH);
pCenter=new Panel();
mycard=new CardLayout();
pCenter.setLayout(mycard);
textHelp=new TextArea();
pCenter.add("hanzi",showCharacters);
pCenter.add("help",textHelp);
add(pCenter,BorderLayout.CENTER);
menubar=new MenuBar();
menu=new Menu("帮助");
help=new MenuItem("关于学汉字");
help.addActionListener(this);
menu.add(help);
menubar.add(menu);
setMenuBar(menubar);
setSize(350,220);
setVisible(true);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
validate();
}
public void itemStateChanged(ItemEvent e)
{ String fileName=choice.getSelectedItem();
File file=new File(fileName);
trainedChinese=chinese.getChinesecharacters(file);
k=0;
mycard.show(pCenter,"hanzi") ;
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==getCharacters)
{ if(trainedChinese!=null)
{ char c=trainedChinese.charAt(k);
k++;
if(k>=trainedChinese.length())
k=0;
showCharacters.setText(""+c);
}
else
{ showCharacters.setText("请选择一个汉字字符文件");
}
}
if(e.getSource()==voiceCharacters)
{ if(!(voiceThread.isAlive()))
{ voiceThread=new Thread(this);
}
try{ voiceThread.start();
}
catch(Exception exp){}
}
if(e.getSource()==help)
{ mycard.show(pCenter,"help") ;
try{ File helpFile=new File("help.txt");
FileReader inOne=【代码4】 //创建指向文件helpFile的inOne 的对象
BufferedReader inTwo=【代码5】 //创建指向文件inOne的inTwo 的对象
String s=null;
while((s=inTwo.readLine())!=null)
{ textHelp.append(s+"\n");
}
inOne.close();
inTwo.close();
}
catch(IOException exp){}
}
}
public void run()
{ voiceCharacters.setEnabled(false);
try{ if(clip!=null)
{ clip.close()
}
clip=AudioSystem.getClip();
File voiceFile=new File(showCharacters.getText().trim()+".wav");
clip.open(AudioSystem.getAudioInputStream(voiceFile));
}
catch(Exception exp){}
clip.start();
voiceCharacters.setEnabled(true);
}
}
StudyMainClass.java
public class StudyMainClass
{ public static void main(String args[])
{ new StudyFrame();
}
}
实验2 统计英文单词字
1．答案：
【代码1】：new RandomAccessFile(file,"rw");
【代码2】：new RandomAccessFile(file,"rw");
【代码3】：inOne.read();
【代码4】：inTwo.seek(wordStarPostion);
【代码5】：inTwo.readFully(cc);
2．模板代码
WordStatistic.java
import java.io.*;
import java.util.Vector;
public class WordStatistic
{ Vector allWorsd,noSameWord;
WordStatistic()
{ allWorsd=new Vector();
noSameWord=new Vector();
}
public void wordStatistic(File file)
{ try{ RandomAccessFile inOne=【代码1】 //创建指向文件file的inOne 的对象
RandomAccessFile inTwo=【代码2】 //创建指向文件file的inTwo 的对象
long wordStarPostion=0,wordEndPostion=0;
long length=inOne.length();
int flag=1;
int c=-1;
for(int k=0;k<=length;k++)
{ c=【代码3】 // inOne调用read()方法
boolean boo=(c<='Z'&&c>='A')||(c<='z'&&c>='a');
if(boo)
{ if(flag==1)
{ wordStarPostion=inOne.getFilePointer()-1;
flag=0;
}
}
else
{ if(flag==0)
{
if(c==-1)
wordEndPostion=inOne.getFilePointer();
else
wordEndPostion=inOne.getFilePointer()-1;
【代码4】// inTwo调用seek方法将读写位置移动到wordStarPostion
byte cc[]=new byte[(int)wordEndPostion-(int)wordStarPostion];
【代码5】// inTwo调用readFully(byte a)方法，向a传递cc
String word=new String(cc);
allWorsd.add(word);
if(!(noSameWord.contains(word)))
noSameWord.add(word);
}
flag=1;
}
}
inOne.close();
inTwo.close();
}
catch(Exception e){}
}
public Vector getAllWorsd()
{ return allWorsd;
}
public Vector getNoSameWord()
{ return noSameWord;
}
}
RandomExample.java
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
import java.io.File;
public class StatisticFrame extends Frame implements ActionListener
{ WordStatistic statistic;
TextArea showMessage;
Button openFile;
FileDialog openFileDialog;
Vector allWord,noSameWord;
public StatisticFrame()
{ statistic=new WordStatistic();
showMessage=new TextArea();
openFile=new Button("Open File");
openFile.addActionListener(this);
add(openFile,BorderLayout.NORTH);
add(showMessage,BorderLayout.CENTER);
openFileDialog=new FileDialog(this,"打开文件话框",FileDialog.LOAD);
allWord=new Vector();
noSameWord=new Vector();
setSize(350,300);
setVisible(true);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
validate();
}
public void actionPerformed(ActionEvent e)
{ noSameWord.clear();
allWord.clear();
showMessage.setText(null);
openFileDialog.setVisible(true);
String fileName=openFileDialog.getFile();
if(fileName!=null)
{ statistic.wordStatistic(new File(fileName));
allWord=statistic.getAllWorsd();
noSameWord=statistic.getNoSameWord();
showMessage.append("\n"+fileName+"中有"+allWord.size()+"个英文单词");
showMessage.append("\n其中有"+noSameWord.size()+"个互不相同英文单词");
showMessage.append("\n按使用频率排列：\n");
int count[]=new int[noSameWord.size()];
for(int i=0;i<noSameWord.size();i++)
{ String s1=(String)noSameWord.elementAt(i);
for(int j=0;j<allWord.size();j++)
{ String s2=(String)allWord.elementAt(j);
if(s1.equals(s2))
count[i]++;
}
}
for(int m=0;m<noSameWord.size();m++)
{ for(int n=m+1;n<noSameWord.size();n++)
{ if(count[n]>count[m])
{ String temp=(String)noSameWord.elementAt(m);
noSameWord.setElementAt((String)noSameWord.elementAt(n),m);
noSameWord.setElementAt(temp,n);
int t=count[m];
count[m]=count[n];
count[n]=t;
}
}
}
for(int m=0;m<noSameWord.size();m++)
{ showMessage.append("\n"+(String)noSameWord.elementAt(m)+
":"+count[m]+"/"+allWord.size()+
"="+(1.0*count[m])/allWord.size());
}
}
}
}
RandomExample.java
public class StatisticMainClass
{ public static void main(String args[])
{ new StatisticFrame();
}
}
实验2 读取Zip文件
1．模板代码
ReadZipFile.java
import java.io.*;
import java.util.zip.*;
public class ReadZipFile
{ public static void main(String args[])
{ File f=new File("book.zip");
File dir=new File("Book");
byte b[]=new byte[100];
dir.mkdir();
try
{ ZipInputStream in=new ZipInputStream(new FileInputStream(f));
ZipEntry zipEntry=null;
while((zipEntry=in.getNextEntry())!=null)
{ File file=new File(dir,zipEntry.getName());
FileOutputStream out=new FileOutputStream(file);
int n=-1;
System.out.println(file.getAbsolutePath()+"的内容：");
while((n=in.read(b,0,100))!=-1)
{ String str=new String(b,0,n);
System.out.println(str);
out.write(b,0,n);
}
out.close();
}
in.close();
}
catch(IOException ee)
{
System.out.println(ee);
}
}
}
上机实践10Java 中的网络编程
实验1 读取服务器端文件
1．答案：
【代码1】：url=new URL(name);
【代码2】：url.getHost();
【代码3】：url.getPort();
【代码4】：url.getFile();
【代码5】：url.openStream();
2．模板代码
ReadFile.java
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
public class ReadURLSource
{ public static void main(String args[])
{ new NetWin();
}
}
class NetWin extends Frame implements ActionListener,Runnable
{ Button button;
URL url;
TextField text;
TextArea area;
byte b[]=new byte[118];
Thread thread;
NetWin()
{ text=new TextField(20);
area=new TextArea(12,12);
button=new Button("确定");
button.addActionListener(this);
thread=new Thread(this);
Panel p=new Panel();
p.add(new Label("输入网址:"));
p.add(text);
p.add(button);
add(area,BorderLayout.CENTER);
add(p,BorderLayout.NORTH);
setBounds(60,60,360,300);
setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{
if(!(thread.isAlive()))
thread=new Thread(this);
try{
thread.start();
}
catch(Exception ee)
{ text.setText("我正在读取"+url);
}
}
public void run()
{ try { int n=-1;
area.setText(null);
String name=text.getText().trim();
【代码1】 //使用字符串name创建url对象
String hostName=【代码2】 //url调用getHost()
int urlPortNumber=【代码3】 //url调用getPort()
String fileName=【代码4】 //url调用getFile()
InputStream in=【代码5】 //url调用方法返回一个输入流
area.append("\n主机:"+hostName+"端口:"+urlPortNumber+
"包含的文件名字:"+fileName);
area.append("\n文件的内容如下:");
while((n=in.read(b))!=-1)
{ String s=new String(b,0,n);
area.append(s);
}
}
catch(MalformedURLException e1)
{ text.setText(""+e1);
return;
}
catch(IOException e1)
{ text.setText(""+e1);
return;
}
}
实验2 使用套接字读取服务器端对象
客户端模板：Client.java答案：
【代码1】：new InetSocketAddress(address,4331);
【代码2】：socket.connect(socketAddress);
【代码3】：socket.getInputStream()
【代码4】：socket.getOutputStream()
服务器端模板：Server.java答案：
【代码1】：new ServerSocket(4331);
【代码2】：server.accept();
【代码3】：socket.getOutputStream()
【代码4】：socket.getInputStream()
2．模板代码
客户端模板：Client.java
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
class Client extends Frame implements Runnable,ActionListener
{ Button connection;
Socket socket=null;
ObjectInputStream in=null;
ObjectOutputStream out=null;
Thread thread;
public Client()
{ socket=new Socket();
connection=new Button("连接服务器,读取文本区对象");
add(connection,BorderLayout.NORTH);
connection.addActionListener(this);
thread = new Thread(this);
setBounds(100,100,360,310);
setVisible(true);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
);
}
public void run()
{ while(true)
{ try{ TextArea text=(TextArea)in.readObject();
add(text,BorderLayout.CENTER);
validate();
}
catch(Exception e)
{ break;
}
}
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==connection)
{ try
{ if(socket.isConnected())
{
}
else
{ InetAddress address=InetAddress.getByName("127.0.0.1");
InetSocketAddress socketAddress=【代码1】//创建端口为4331、地址为
//address的socketAddress
【代码2】 //socket建立和socketAddress的连接呼叫。
in =new ObjectInputStream(【代码3】); //socket返回输入流
out = new ObjectOutputStream(【代码4】); //socket返回输出流
thread.start();
}
}
catch (Exception ee){}
}
}
public static void main(String args[])
{ Client win=new Client();
}
}
服务器端模板：Server.java
import java.io.*;
import java.net.*;
import java.util.*;
import java.awt.*;
public class Server
{ public static void main(String args[])
{ ServerSocket server=null;
ServerThread thread;
Socket you=null;
while(true)
{ try{ server=【代码1】//创建在端口4331上负责监听的 ServerSocket对象
}
catch(IOException e1)
{ System.out.println("正在监听");
}
try{ you=【代码2】 // server返回和客户端相连接的Socket对象
System.out.println("客户的地址:"+you.getInetAddress());
}
catch (IOException e)
{ System.out.println("正在等待客户");
}
if(you!=null)
{ new ServerThread(you).start();
}
else{ continue;
}
}
}
}
class ServerThread extends Thread
{ Socket socket;
ObjectInputStream in=null;
ObjectOutputStream out=null;
String s=null;
ServerThread(Socket t)
{ socket=t;
try { out=new ObjectOutputStream(【代码3】); //socket返回输出流。
in=new ObjectInputStream(【代码4】); //socket返回输入流。
}
catch (IOException e)
{}
}
public void run()
{ TextArea text=new TextArea("你好,我是服务器",12,12);
try{ out.writeObject(text);
}
catch (IOException e)
{ System.out.println("客户离开");
}
}
}
实验3 基于UDP的图像传输
客户端模板：Client.java答案：
【代码1】：new DatagramPacket(b,b.length,address,1234);
【代码2】：new DatagramSocket();
【代码3】：mailSend.send(data);
【代码4】：mailReceive=new DatagramSocket(5678);
服务器端模板：Server.java答案：
【代码1】：new DatagramSocket(1234);
【代码2】：pack.getAddress();
【代码3】：new DatagramPacket(b,n,address,5678);
【代码4】：new DatagramSocket();
【代码5】：mailSend.send(data);
【代码6】：new DatagramPacket(end,end.length,address,5678);
【代码7】：new DatagramSocket();
【代码8】：mailSend.send(data);
2．模板代码
客户端模板：Client.java
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
class ImageCanvas extends Canvas
{ Image image=null;
public ImageCanvas()
{ setSize(200,200);
}
public void paint(Graphics g)
{ if(image!=null)
g.drawImage(image,0,0,this);
}
public void setImage(Image image)
{ this.image=image;
}
}
class Client extends Frame implements Runnable,ActionListener
{ Button b=new Button("获取图像");
ImageCanvas canvas;
Client()
{ super("I am a client");
setSize(320,200);
setVisible(true);
b.addActionListener(this);
add(b,BorderLayout.NORTH);
canvas=new ImageCanvas();
add(canvas,BorderLayout.CENTER);
Thread thread=new Thread(this);
validate();
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
);
thread.start();
}
public void actionPerformed(ActionEvent event)
{ byte b[]="请发图像".trim().getBytes();
try{ InetAddress address=InetAddress.getByName("127.0.0.1");
DatagramPacket data=【代码1】 //创建数据包，该数据包的目标地址和端口分别是
//address和1234，其中的数据为数组b中的全部字节。
DatagramSocket mailSend=【代码2】 //创建负责发送数据的DatagramSocket对象。
【代码3】 // mailSend发送数据data。
}
catch(Exception e){}
}
public void run()
{ DatagramPacket pack=null;
DatagramSocket mailReceive=null;
byte b[]=new byte[8192];
ByteArrayOutputStream out=new ByteArrayOutputStream();
try{ pack=new DatagramPacket(b,b.length);
【代码4】 //创建在端口5678负责收取数据包的DatagramSocket对象。
}
catch(Exception e){}
try{ while(true)
{ mailReceive.receive(pack);
String message=new String(pack.getData(),0,pack.getLength());
if(message.startsWith("end"))
{ break;
}
out.write(pack.getData(),0,pack.getLength());
}
byte imagebyte[]=out.toByteArray();
out.close();
Toolkit tool=getToolkit();
Image image=tool.createImage(imagebyte);
canvas.setImage(image);
canvas.repaint();
validate();
}
catch(IOException e){}
}
public static void main(String args[])
{ new Client();
}
}
服务器端模板：Server.java
import java.net.*;
import java.io.*;
public class Server
{
public static void main(String args[])
{ DatagramPacket pack=null;
DatagramSocket mailReceive=null;
ServerThread thread;
byte b[]=new byte[8192];
InetAddress address=null;
pack=new DatagramPacket(b,b.length);
while(true)
{ try{ mailReceive=【代码1】//创建在端口1234负责收取数据包的
//DatagramSocket对象。
}
catch(IOException e1)
{ System.out.println("正在等待");
}
try{ mailReceive.receive(pack);
address=【代码2】 //pack返回InetAddress对象。
System.out.println("客户的地址:"+address);
}
catch (IOException e) { }
if(address!=null)
{ new ServerThread(address).start();
}
else
{ continue;
}
}
}
}
class ServerThread extends Thread
{ InetAddress address;
DataOutputStream out=null;
DataInputStream in=null;
String s=null;
ServerThread(InetAddress address)
{ this.address=address;
}
public void run()
{ FileInputStream in;
byte b[]=new byte[8192];
try{ in=new FileInputStream ("a.jpg");
int n=-1;
while((n=in.read(b))!=-1)
{ DatagramPacket data=【代码3】 //创建数据包，目标地址和端口分别是
//address和5678，其中的数据为数组b中的前n个字节
DatagramSocket mailSend=【代码4】 //创建发送数据的DatagramSocket对象
【代码5】 // mailSend发送数据data
}
in.close();
byte end[]="end".getBytes();
DatagramPacket data=【代码6】 //创建数据包，目标地址和端口分别是
//address和5678，其中的数据为数组end中的全部字节
DatagramSocket mailSend=【代码7】 //创建负责发送数据的DatagramSocket对象
【代码8】 // mailSend发送数据data
}
catch(Exception e){}
}
}