java典型应用彻查1000例第二卷网络应用开发源码习题bookjavavol_2ch

1、第十四章交叉传输(Intercross Transition)14-1 简介14-2 键盘输入 / 交叉传输打印14-3 习题(Exercises)14-1 简介前述各章节均在描述Client端发送消息、Server端接收消息。本章将探讨Server/Client相互发送与接收的交叉传输（Intercross Transition)，其中关键问题在当一个节点在发送消息时，无法同时接收消息。14-2 键盘输入 / 交叉传输打印Server/Client相互发送与接收的关键问题，在于发送时无法同时执行接收。在本章中使用特殊符号，将发送与接收时段以人工方式分隔；将再于第十九章探讨如何以系统功能执行自

2、动分隔。范例136：设有文件Server14.java、Client14.java其功能为解释Server/Client网络交叉传输的应用。文件Server14.java：01 import .*;02 import java.io.*;03 import java.util.*;04 public class Server14 05 static int port;06 int messagein, flag, i;07 public Server14() 08 try09 ServerSocket SS = new ServerSocket(port);10 System.out.prin

3、tln(Server is created and waiting Client to connect.);范例136：续111 Socket socket = SS.accept();12 System.out.println(Client IP = +socket.getInetAddress().getHostAddress();13 DataInputStream instream = newDataInputStream(socket.getInputStream();14 DataOutputStream outstream = newDataOutputStream(socket

4、.getOutputStream();15 InputStreamReader isr = new InputStreamReader(System.in);16 BufferedReader br = new BufferedReader(isr);17 System.out.println(Input data on keyboard.);18while(true) 范例136：续219messagein = instream.readInt();20System.out.print(char)messagein);21if (messagein = 64) 22flag = 1;23Sy

5、stem.out.println( );2425while(flag = 1) 26i = br.read();27outstream.writeInt(i);28if (i = 64) 29flag = 0;303132 33 范例136：续334 catch(IOException e)35 System.out.println(e.getMessage();36 37 38 public static void main(String args)39 if(args.length 1)40 System.out.println(Usage: java Server14 port);41

6、System.exit(1);42 43 port=Integer.parseInt(args0);44 Server14 ServerStart=new Server14();45 46 范例136：续4文件Client14.java：47 import java.io.*;48 import .*;49 public class Client14 50 int i, flag, messagein;51 static String iaddr;52 static int port;53 public Client14() 54 try55 Socket socket=new Socket(

7、InetAddress.getByName(iaddr),port);56 DataOutputStream outstream = newDataOutputStream(socket.getOutputStream();57 DataInputStream instream = newDataInputStream(socket.getInputStream(); 范例136：续558 InputStreamReader isr = new InputStreamReader(System.in);59 BufferedReader br = new BufferedReader(isr)

8、;60 System.out.println(Input data on keyboard.);61while(true) 62i = br.read();63outstream.writeInt(i);64if (i = 64) 65flag = 1;6667while (flag = 1) 68messagein = instream.readInt();69System.out.print(char)messagein);70if (messagein = 64) 71flag = 0;72System.out.println( );737475 76 范例136：续677 catch(IOException e)78 System.out.println(e.getMessage();79 80 81 public static void main(String args) 82 if (args.length 2)83 System.out.println(USAGE: java Cli