java网络编程复习题（2013考试题库）(4)

mport java.net.*; import java.io.*; class Server{ public Server() { try {

ServerSocket ss = new ServerSocket(8629);

System.out.println(\服务器端已运行，等待客户端连接：\ Socket socket = ss.accept(); //接收客户端的连接请求；

BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())); PrintWriter out = new PrintWriter(socket.getOutputStream(),true);

BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String line; while(true)

{line = (in.readLine().trim()); if(line.equals(\)

{ out.println(\ out.close(); in.close();

socket.close(); br.close(); ss.close();

break;}

System.out.println(\客户输入为 :\ System.out.println(\请输入回答:\

line=br.readLine(); //从键盘上输入信息； out.println(line); //向对方发送信息 } }

catch (IOException e){} }

public static void main(String[] args) throws Exception{ new Server(); } }

13、TCP客户端需要向服务器端8629发出连接请求，与服务器进行信息交流，当收到服务器发来的是“BYE”时，立即向对方发送“BYE”，然后关闭连接，否则，继续向服务器发送信息。

import java.io.*; import java.net.*; class Client2{ public Client2() { try {String s;

Socket socket = new Socket(\服务器地址\

BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())); PrintWriter out = new PrintWriter(socket.getOutputStream(),true);

BufferedReader line = new BufferedReader(new InputStreamReader(System.in)); while(true)

{ System.out.println(\请向服务器输出一条字符串：\ s=line.readLine();

out.println(s); //向服务器发出信息；

s=in.readLine().trim(); //收到服务器发来的信息； System.out.println(\服务器返回的信息是：\ System.out.println(s); if(s.equals(\ { out.println(\

line.close(); out.close(); in.close();

socket.close(); break;} } }

catch (IOException e){} }

public static void main(String[] args) { new Client2(); }}

14、UDP接收端

import java.io.*; import java.net.*; class Server {

public static void main(String[] args) { new UDPServer() ; } }

class UDPServer { public UDPServer() { try {

DatagramSocket socket = new DatagramSocket(1986); //建立一个Socket连接

System.out.println(\服务器IP：\+ InetAddress.getLocalHost().getHostAddress()); //显示服务器信息

while (true) { // 接收

byte[] instr = new byte[200];

DatagramPacket receive = new DatagramPacket(instr, instr.length); socket.receive(receive); //接收客户机发过来的数据 String str = new String(receive.getData()); //提取数据 if(str.trim().equals(\ {socket.close();break;}

System.out.println(\收到客户端消息：\打印客户机消息 // 发送

System.out.print(\服务器发送消息：\

str = new BufferedReader(new InputStreamReader(System.in)).readLine(); //得到输入的数据

byte[] outstr = new byte[str.length()]; outstr = str.getBytes();

DatagramPacket send = new DatagramPacket(outstr,outstr.length, receive.getAddress(), receive.getPort()); //向客户机发送数据 socket.send(send); //执行发送 }

} catch (Exception e) { //错误处理

//e.printStackTrace(); } } }

15、UDP发送端 import java.io.*; import java.net.*; class Client {

public static void main(String[] args) { new UDPClient(); } }

class UDPClient { public UDPClient() {

System.out.print(\请输入服务器的地址：\ String serverip = null; try {

serverip = new BufferedReader(new InputStreamReader(System.in)).readLine(); //取得输入的服务器地址

} catch (IOException e1) { //错误处理

//e1.printStackTrace(); } try {

DatagramSocket socket = new DatagramSocket(); //建立Socket while (true) { // 发送

System.out.print(\客户端发送消息：\

String send = new BufferedReader(new InputStreamReader(System.in)).readLine(); //读入客户机输入的消息

byte[] outstr = new byte[send.length()]; outstr = send.getBytes();

InetAddress address = InetAddress.getByName(serverip);

DatagramPacket packet = new DatagramPacket(outstr, outstr.length, address, 1986); //向服务器发送数据报

socket.send(packet); //发送数据报 // 接收

byte[] instr = new byte[200];

packet = new DatagramPacket(instr, instr.length); //接收数据报 socket.receive(packet); //接收数据

String out = new String(packet.getData()); //取出信息 if(out.trim().equals(\ {socket.close();break;}

System.out.println(\收到服务器消息：\打印服务器发过来的信息 }

} catch (Exception e) { // 错误处理

// e.printStackTrace(); } } }

16、设access数据库中有student表，表中存放学生学号，姓名两个字段，请编写程序输出表中所有记录信息。（假定已经配置好数据源为：mydb11） import java.sql.*; class access{

public static void main(String args[]){ Connection con;

Statement sql; //声明Statement对象 ResultSet rs; try{

Class.forName(\ }

catch(ClassNotFoundException e){ System.out.println(\} try{

con=DriverManager.getConnection(\sql=con.createStatement(); rs=sql.executeQuery(\while(rs.next()){

String num=rs.getString(1); //获得数据库第一列 String name=rs.getString(2);

System.out.print(\学号:\输出信息 System.out.print(\ 姓名:\System.out.println(); }

con.close();}

catch(SQLException el){} }

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