第四週計算機網路

作業:
1. 撰寫程式
開啟主程式輸入10筆資料交由副程式排序，排序後在交由主程式印出
Source code:
#include "stdafx.h"
#include "stdio.h"
#include "stdlib.h"
#include <iostream>
using namespace std;
void bubble(int data[]);
int _tmain(int argc, _TCHAR* argv[])
{
int data[10];
for(int i=0;i<10;i++)
scanf_s("%d",&data[i]);
bubble(data);
for(int j=0;j<10;j++)
printf("%d ",data[j]);
system("pause");
return 0;
}
void bubble(int data[])
{
int i,j,temp;
for( i=1;i<10;i++)
for( j=0;j<(10-i);j++)
if(data[j]>data[j+1])
{
temp=data[j];
data[j]=data[j+1];
data[j+1]=temp;
}
}
執行結果:



2. 程式說明
搜尋任一socket program，並解釋說明之

socket:
Linux作業系統使用socket觀念來設計網路程式,
socket 是一種可做雙向資料傳輸的通道，Linux程序可經由此裝置與本地端或是遠端的程序做溝通。

Linux socket分成unix-domain socket和internet-domain socket二種。unix-domain socket又稱為local socket，主要用來與本地端的程序溝通。internet-domain socket用來與遠地端的程序溝通。

socket programming:
1.有server&client兩端
2.server只有一個,而client可能有多個
3.server可設定監聽(listen)port number
socket program範例:

• Server.java

package onlyfun.caterpillar;

import java.io.*;
import java.net.*;

public class Server {
    public static void main(String[] args) { 
        try { 
            int port = Integer.parseInt(args[0]);
            System.out.println("簡易檔案接收..."); 
            System.out.printf("將接收檔案於連接埠: %d%n", port); 

            ServerSocket serverSkt = new ServerSocket(port); 
            
            while(true) { 
                System.out.println("傾聽中...."); 
                
                Socket clientSkt = serverSkt.accept();
                
                System.out.printf("與 %s 建立連線%n", 
                        clientSkt.getInetAddress().toString());  
                
                // 取得檔案名稱
                String fileName = new BufferedReader(
                                    new InputStreamReader(
                                      clientSkt.getInputStream())).readLine();
                
                System.out.printf("接收檔案 %s ...", fileName); 

                BufferedInputStream inputStream = 
                    new BufferedInputStream(clientSkt.getInputStream()); 
                BufferedOutputStream outputStream = 
                    new BufferedOutputStream(new FileOutputStream(fileName)); 
                
                int readin; 
                while((readin = inputStream.read()) != -1) { 
                    outputStream.write(readin);
                    Thread.yield();
                } 

                outputStream.flush();
                outputStream.close();                
                inputStream.close(); 
                
                clientSkt.close(); 
                
                System.out.println("\n檔案接收完畢！"); 
            } 
        } 
        catch(Exception e) { 
            e.printStackTrace(); 
        } 
    }     
}

再來是客戶端程式： 

• Client.java

package onlyfun.caterpillar;

import java.io.*;
import java.net.*;

public class Client {
    public static void main(String[] args) {        
        try { 
            System.out.println("簡易檔案傳送..."); 

            String remoteHost = args[0];
            int port = Integer.parseInt(args[1]);
            File file = new File(args[2]); 
            
            System.out.printf("遠端主機: %s%n", remoteHost); 
            System.out.printf("遠端主機連接埠: %d%n", port);
            System.out.printf("傳送檔案: %s%n", file.getName());

            Socket skt = new Socket(remoteHost, port); 

            System.out.println("連線成功！嘗試傳送檔案....");

            PrintStream printStream = 
                new PrintStream(skt.getOutputStream()); 
            printStream.println(file.getName()); 

            System.out.print("OK! 傳送檔案...."); 
            
            BufferedInputStream inputStream = 
                new BufferedInputStream( 
                        new FileInputStream(file)); 

            int readin; 
            while((readin = inputStream.read()) != -1) { 
                 printStream.write(readin); 
                 Thread.yield();
            } 

            printStream.flush();
            printStream.close();
            inputStream.close(); 
            
            skt.close();
            
            System.out.println("\n檔案傳送完畢！"); 
        } 
        catch(Exception e) { 
            e.printStackTrace(); 
        } 
    } 
}

筆記: