UDP——绘制温度曲线.doc

实验指导书实验五、UDP绘制温度曲线一、实验目的1 熟悉UDP编程的基本过程2 理解UDP协议相关的基本概念3 掌握UDP协议与线程的结合方式二、实验内容1 利用UDP协议实现一个简单的白板程序，要求如下：用户在客户端界面上单击鼠标左键后程序在鼠标单击位置画20*20的圆形，单击右键后程序在鼠标单击位置画20*20的圆。服务器界面上将同时显示与客户端一致的画面。2 采用UDP编写一个网络程序，该程序的客户端每隔1秒向服务端发送一个温度值，服务端能够接收该温度值并显示一条动态温度曲线。其界面如下：3 如果要求每增加一个客户端则增加一条动态曲线，并且显示一条所有客户端的平均温度曲线，该程序应该如何改变？三、实验步骤1 针对第1题，定义数据传递的格式为：对象类型（圆、正方形等等）X坐标Y坐标1字节2字节2字节2 实现客户端绘制程序，其代码如下：package lab.lab5;import java.applet.*;import java.awt.*;import java.awt.event.*;import java.io.*;import .*;import java.util.*;public class BoardClient extends Applet implements MouseListenerprivate Graphics gBuf;private Image imgBuf;private ArrayList shapeList=new ArrayList();public static void main(String args) Frame app = new Frame(白板客户端);app.setSize(400, 400);app.setLocationByPlatform(true);BoardClient applet = new BoardClient();applet.addMouseListener(applet);app.add(applet);app.addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent event) event.getWindow().dispose();System.exit(0););app.show();applet.start();public void init() public void paint(Graphics g) int graphWidth = bounds().width;int graphHeight = bounds().height;imgBuf = createImage(graphWidth, graphHeight);gBuf = imgBuf.getGraphics();gBuf.clearRect(0, 0, graphWidth, graphHeight);Iterator it=shapeList.iterator();Shape shape;while (it.hasNext()shape=(Shape)it.next();if (shape.type=Shape.CIRCLE)gBuf.drawOval(shape.x-10,shape.y-10,20,20);else if (shape.type=Shape.SQUARE)gBuf.drawRect(shape.x-10,shape.y-10,20,20);g.drawImage(imgBuf, 0, 0, this);public void update(Graphics g) paint(g);public void mousePressed(MouseEvent e) Shape shape; if (e.getButton()=e.BUTTON1) shape=new Shape(Shape.CIRCLE,e.getPoint().x,e.getPoint().y); shapeList.add(shape); else if (e.getButton()=e.BUTTON3) shape=new Shape(Shape.SQUARE,e.getPoint().x,e.getPoint().y);shapeList.add(shape); repaint(); /* Empty method definition. */ public void mouseReleased(MouseEvent e) /* Empty method definition. */ public void mouseEntered(MouseEvent e) /* Empty method definition. */ public void mouseExited(MouseEvent e) public void mouseClicked(MouseEvent e) /Event listener implementation goes here. 3 在该程序中添加发送网络数据的代码。代码中所用到的Shape类请参照代码自行补充。 public void sendData(Shape shape) DatagramSocket ds;try ds = new DatagramSocket(); catch (SocketException e1) / TODO Auto-generated catch blocke1.printStackTrace();return;DatagramPacket packet;ByteArrayOutputStream bao = new ByteArrayOutputStream();DataOutputStream dos = new DataOutputStream(bao);try dos.writeByte(shape.type);dos.writeInt(shape.x);dos.writeInt(shape.y);byte b=bao.toByteArray();packet=new DatagramPacket(b,b.length,InetAddress.getByName(localhost),2007);ds.send(packet);dos.close();ds.close(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace(); 4 参照客户端程序实现服务器端程序。5 实现温度曲线客户端程序。其代码如下：package network;import java.io.*;import .*;import java.util.*;public class TempleratureClient public static void main(String args) int temper;DatagramSocket ds;DatagramPacket packet;try temper = 10;Random r=new Random();ds = new DatagramSocket();while (true) temper=(Math.abs(r.nextInt()%75-30);ByteArrayOutputStream bao = new ByteArrayOutputStream();DataOutputStream dos = new DataOutputStream(bao);dos.writeInt(temper);byteb=bao.toByteArray();packet=new DatagramPacket(b,b.length,InetAddress.getByName(localhost),55000);ds.send(packet);try Thread.sleep(1000); catch (InterruptedException e) e.printStackTrace(); catch (IOException e) e.printStackTrace();6 实现温度曲线服务器端程序。下面是它的部分代码：package network;import java.applet.*;import java.awt.*;import java.awt.event.*;import java.io.*;import .*;public class TemperatureServer extends Applet static String str = |;static final int MAXLENGTH=24;static int temper = new intMAXLENGTH;private Graphics gBuf;private Image imgBuf;public static void main(String args) Frame app = new Frame(温度曲线显示程序);app.setSize(800, 600);app.setLocationByPlatform(true);TemperatureServer applet = new TemperatureServer();app.add(applet);app.addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent event) event.getWindow().dispose();System.exit(0););app.show();applet.start();for (int i = 0; i MAXLENGTH; i+)temperi = 0;applet.repaint();/请补充完整public TemperatureServer() public void init() public void paint(Graphics g) final int leftMargin = 60;final int rightMargin = 100;final int topMargin = 40;final int bottomMargin = 40;final int maxY = 45;final int minY = -30;final int maxX = MAXLENGTH;final int minX = 0;final int valueScaleX = 1;final int valueScaleY = 5;final int countX = (maxX - minX) / valueScaleX;final int countY = (maxY - minY) / valueScaleY;int graphWidth = bounds().width;int graphHeight = bounds().height;imgBuf = createImage(graphWidth, graphHeight);gBuf = imgBuf.getGraphics();gBuf.clearRect(0, 0, graphWidth, graphHeight);gBuf.drawString(温度曲线图, (graphWidth - (topMargin + rightMargin) / 2,topMargin / 2);/ 绘制坐标系int scaleY = (graphHeight - topMargin - bottomMargin) / countY;int scaleX = (graphWidth - leftMargin - rightMargin) / countX;gBuf.setColor(Color.BLACK);gBuf.drawLine(leftMargin, graphHeight - bottomMargin - scaleY * countY,leftMargin, graphHeight - bottomMargin);gBuf.drawLine(leftMargin, graphHeight - bottomMargin, leftMargin+ scaleX * countX, graphHeight - bottomMargin);/ 绘制坐标系说明/ gBuf.setFont(new Font(黑体, Font.BOLD, 16);gBuf.drawString(温度（C）, leftMargin / 2, topMargin / 2);gBuf.drawString(时间（t）, graphWidth - rightMargin / 2, graphHeight- bottomMargin / 2);/ 绘制刻度for (int i = 0; i = countX; i+) gBuf.drawLine(leftMargin + i * scaleX, graphHeight - bottomMargin,leftMargin + i * scaleX, graphHeight - bottomMargin - 5);gBuf.drawString( + (minX + i * valueScaleX), leftMargin + i* scaleX, graphHeight - bottomMargin + bottomMargin / 2);for (int i = 0; i = countY; i+) gBuf.drawLine(leftMargin,(graphHeight - bottomMargin) - i * scaleY, leftMargin + 5,(graphHeight - bottomMar