Java项目实训

1、Java项目实训一、将服务器上的资源读到本机1、从键盘输入网址，将该网址的内容读入到本机并输出import .*;import java.io.*;import java.util.*;public class Lx1 public static void main(String args) Scanner scanner; URL url; System.out.println("输入URL资源,例如:"); scanner = new Scanner(System.in); String source = scanner.nextLine(); try url = ne

2、w URL(source); InputStream in = url.openStream(); byte b = new byte1024; int n=-1; while(n=in.read(b)!=-1) String str = new String(b,0,n); System.out.print(str); catch(Exception exp) System.out.println(exp); 2、从键盘输入网址，将该网址的内容读入到本机并输出到一个文件urltext中。import .*;import java.io.*;import java.io.*;import ja

3、va.util.*;public class Lx2 public static void main(String args) Scanner scanner; URL url; System.out.println("输入URL资源,例如:"); scanner = new Scanner(System.in); String source = scanner.nextLine(); try url = new URL(source); InputStream in = url.openStream(); byte b = new byte1024; int n=-1;

4、FileOutputStream out=new FileOutputStream("urltext.txt"); while(n=in.read(b)!=-1) String str = new String(b,0,n); out.write(b,0,n); System.out.print(str); catch(Exception exp) System.out.println(exp); 3、用线程技术实现上述程序import .*;import java.io.*;import java.util.*;public class Example13_1 publi

5、c static void main(String args) Scanner scanner; URL url; Thread readURL; Look look = new Look(); System.out.println("输入URL资源,例如:"); scanner = new Scanner(System.in); String source = scanner.nextLine(); try url = new URL(source); look.setURL(url); readURL = new Thread(look); catch(Exceptio

6、n exp) System.out.println(exp); readURL = new Thread(look); readURL.start(); import .*;import java.io.*;public class Look implements Runnable URL url; public void setURL(URL url) this.url=url; public void run() try InputStream in = url.openStream(); byte b = new byte1024; int n=-1; while(n=in.read(b

7、)!=-1) String str = new String(b,0,n); System.out.print(str); catch(IOException exp) 二、读取主机地址和本机地址1、调试下列读取主机名称及IP地址的程序import .*; public class Example13_2 public static void main(String args) try InetAddress address_1=InetAddress.getByName(""); System.out.println(address_1.toString(); InetA

8、ddress address_2=InetAddress.getByName("166.111.222.3"); System.out.println(address_2.toString(); catch(UnknownHostException e) System.out.println("无法找到 "); 2、从键盘输入任意主机名，读取主机地址、本机地址import .*;import java.io.*;import java.io.*;import java.util.*;public class Ex2 public static void

9、main(String args) Scanner scanner; URL url; System.out.println("输入URL资源,例如:"); scanner = new Scanner(System.in); String source = scanner.nextLine(); try InetAddress address_1=InetAddress.getByName(source); System.out.println(address_1.toString(); InetAddress address_2=InetAddress.getLocalH

10、ost(); System.out.println(address_2.toString(); catch(UnknownHostException e) System.out.println("无法找到 "); 三、套接字应用1、编程实现客户端与服务端之间的应答通讯服务端代码：import java.io.*;import .*;public class Server public static void main(String args) String answer ="南非","进入世界杯了","哈哈.问题真逗!&qu

11、ot; ServerSocket serverForClient=null; Socket socketOnServer=null; DataOutputStream out=null; DataInputStream in=null; try serverForClient = new ServerSocket(2010); catch(IOException e1) System.out.println(e1); try System.out.println("等待客户呼叫"); socketOnServer = serverForClient.accept(); /堵

12、塞状态，除非有客户呼叫 out=new DataOutputStream(socketOnServer.getOutputStream(); in=new DataInputStream(socketOnServer.getInputStream(); for(int i=0;i<answer.length;i+) String s=in.readUTF(); / in读取信息，堵塞状态 System.out.println("服务器收到客户的提问:"+s); out.writeUTF(answeri); Thread.sleep(500); catch(Except

13、ion e) System.out.println("客户已断开"+e); 服务端代码import java.io.*;import .*;public class Server public static void main(String args) String answer ="南非","进入世界杯了","哈哈.问题真逗!" ServerSocket serverForClient=null; Socket socketOnServer=null; DataOutputStream out=null; Dat

14、aInputStream in=null; try serverForClient = new ServerSocket(2010); catch(IOException e1) System.out.println(e1); try System.out.println("等待客户呼叫"); socketOnServer = serverForClient.accept(); /堵塞状态，除非有客户呼叫 out=new DataOutputStream(socketOnServer.getOutputStream(); in=new DataInputStream(soc

15、ketOnServer.getInputStream(); for(int i=0;i<answer.length;i+) String s=in.readUTF(); / in读取信息，堵塞状态 System.out.println("服务器收到客户的提问:"+s); out.writeUTF(answeri); Thread.sleep(500); catch(Exception e) System.out.println("客户已断开"+e); 2、通过键盘输入问答方式，实现客户与服务器之间的对话，任何一端回答“bye”时，结束。服务器端程序

16、代码：import java.io.*;import .*;import java.util.*;public class Server1 public static void main(String args) String answer; ServerSocket serverForClient=null; Socket socketOnServer=null; DataOutputStream out=null; DataInputStream in=null; Scanner scanner= new Scanner(System.in); try serverForClient =

17、new ServerSocket(2010); catch(IOException e1) System.out.println(e1); try System.out.println("等待客户呼叫"); socketOnServer = serverForClient.accept(); /堵塞状态，除非有客户呼叫 out=new DataOutputStream(socketOnServer.getOutputStream(); in=new DataInputStream(socketOnServer.getInputStream(); while(true) St

18、ring s=in.readUTF(); / in读取信息，堵塞状态 System.out.println("服务器收到客户的发言:"+s); System.out.print("服务器发言:"); answer = scanner.nextLine(); if (answer.equals("bye") break; out.writeUTF(answer); catch(Exception e) System.out.println("客户已断开"+e); 客户端代码：import .*;import java

19、.io.*;import java.util.*;public class Client1 public static void main(String args) Scanner scanner= new Scanner(System.in); String mess; String s; Socket mysocket; DataInputStream in=null; DataOutputStream out=null; try mysocket=new Socket("127.0.0.1",2010); in=new DataInputStream(mysocket

20、.getInputStream(); out=new DataOutputStream(mysocket.getOutputStream(); while (true) System.out.print("客户发言："); mess = scanner.nextLine(); if (mess.equals("bye") break; out.writeUTF(mess); s=in.readUTF(); /in读取信息，堵塞状态 System.out.println("客户收到服务器的信息:"+s); catch(Exception

21、 e) System.out.println("服务器已断开"+e); 3、服务器端代码不变，客房端按以下届面设计客户端的程序代码如下：public class Client2 public static void main(String args) Cc win=new Cc(); win.setBounds(100,100,460,360); win.setTitle("聊天程序客户端") import java.awt.event.*;import java.awt.*;import javax.swing.*;import .*;import j

22、ava.io.*;import java.util.*;public class Cc extends JFrame JTextField inputText; JTextArea textShow; JButton button; PoliceListen listener; public Cc() init(); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); void init() Socket mysocket; DataInputStream in=null; DataOutputStream out

23、=null; try mysocket=new Socket("127.0.0.1",2010); in=new DataInputStream(mysocket.getInputStream(); out=new DataOutputStream(mysocket.getOutputStream(); setLayout(new FlowLayout(); textShow = new JTextArea(9,30); inputText = new JTextField(10); button = new JButton("发送"); listene

24、r = new PoliceListen(); listener.setJTextField(inputText); listener.setJTextArea(textShow); listener.setIn(in); listener.setOut(out); inputText.addActionListener(listener); button.addActionListener(listener); add(new JScrollPane(textShow); add(inputText); add(button); catch(Exception e) System.out.println("服