第十三章 網路檔案傳遞(File Transition)

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1 第十三章 網路檔案傳遞(File Transition)
13-1 簡介 13-2 FileInputStream Class 13-3 FileOutputStream Class 13-4 檔案傳遞(File Translation) 13-5 檔案上傳(File Upload) 13-6 檔案下載(File Download) 13-7 習題(Exercises)

2 13-1 簡介 前章網路訊息傳遞，是為小宗串流傳遞，本章將介紹網路檔案傳遞，是為大宗串流傳遞。除了要使用網路資料串流外，另外要使用本機當地資料串流，讀取檔案內的資料、或將資料寫入檔案。

3 13-2 FileInputStream Class
java.io.FileInputStream繼承(extends) 自InputStream→Object，此類別從檔案建立一個低階輸入串流，使用其中之方法程序讀取檔案內容。

4 13-3 FileOutputStream Class
java.io.FileOutputStream繼承(extends) 自OutputStream→Object，此類別建立一個低階輸出串流，使用其中之方法程序將串流內容寫入指定檔案。

5 13-4 檔案傳遞(File Translation)
設計範例130，於Client端讀取特定檔案的內容，再由網路將內容傳送到Server端之特定檔案內。

6 範例130：設有檔案Server13_4.java、Client13_4.java其功能為解釋檔案傳遞之應用。
檔案Server13_4.java： 01 import java.net.*; 02 import java.io.*; 03 public class Server13_4 { 04 int messagein; 05 static int port; 06 static String outfilename; 07 public Server13_4() { 08 try{ ServerSocket SS = new ServerSocket(port); System.out.println("Server is created and waiting Client to connect..."); Socket socket = SS.accept(); System.out.println("Client IP = " + socket.getInetAddress().getHostAddress());

7 範例130：續1 13 DataInputStream instream = new
DataInputStream(socket.getInputStream()); FileOutputStream fos = new FileOutputStream(outfilename); while(messagein != -1){ messagein = instream.readInt(); fos.write(messagein); } System.out.println("Data written to File successfully!"); 20 } 21 catch(IOException e){ System.out.println(e.getMessage()); 23 } 24 }

8 範例130：續2 25 public static void main(String args[]){
26 if(args.length < 2){ System.out.println("Usage: java Server13_4 [port] [outfilename]"); System.exit(1); 29 } 30 port=Integer.parseInt(args[0]); 31 outfilename = args[1]; 32 Server13_4 ServerStart=new Server13_4(); 33 } 34 }

9 範例130：續3 檔案Client13_4.java： 35 import java.io.*; 36 import java.net.*;
37 public class Client13_4 { 38 int i; 39 static String iaddr; 40 static int port; 41 static String infilename; 42 public Client13_4() { 43 try{ Socket socket=new Socket(InetAddress.getByName(iaddr),port); DataOutputStream outstream = new DataOutputStream(socket.getOutputStream()); FileInputStream fis = new FileInputStream(infilename);

10 範例130：續4 47 while((i=fis.read()) !=-1) outstream.writeInt(i);
System.out.println("Data sent to internet successfully!"); socket.close(); } catch(IOException e){ System.out.println(e.getMessage()); } 55 }

11 範例130：續5 56 public static void main(String args[]) {
57 if (args.length < 3){ System.out.println("USAGE: java Client13_4 [iaddr] [port] [infilename]"); System.exit(1); 60 } 61 iaddr = args[0]; 62 port=Integer.parseInt(args[1]); 63 infilename = args[2]; 64 Client13_4 ClientStart=new Client13_4(); 65 } 66 }

12 13-5 檔案上傳(File Upload) 設計範例131，從Client端將特定檔案由網路上傳(Upload) 到Server端所在目錄內。也即、當要對特定檔案執行網路上傅時，將本例Client.class置於該特定檔案所在目錄，再將本例Server.class置於遠端目的目錄，依執行步驟即可上傳該特定檔案。

13 範例131：設有檔案Server_upload.java、Client_upload.java其功能為解釋檔案上傳之應用。
檔案Server_upload.java： 01 import java.net.*; 02 import java.io.*; 03 public classServer_upload { 04 static int port; 05 static String uploadFile; 06 int messagein; 07 public Server_upload() { 08 try{ ServerSocket SS = new ServerSocket(port); System.out.println("Server_upload is ready..."); Socket cmdsocket = SS.accept(); Socket datasocket = SS.accept();

14 範例131：續1 13 System.out.println("Client IP = " +
cmdsocket.getInetAddress().getHostAddress()); DataInputStream cmdinstream = new DataInputStream(cmdsocket.getInputStream()); uploadFile = cmdinstream.readUTF(); DataInputStream datainstream = new DataInputStream(datasocket.getInputStream()); FileOutputStream fos = new FileOutputStream(uploadFile); while(messagein != -1){ messagein = datainstream.readInt(); fos.write(messagein); } System.out.println("File is uploaded successfully!"); 23 }

15 範例131：續2 24 catch(IOException e){
System.out.println(e.getMessage()); 26 } 27 } 28 public static void main(String args[]){ 29 if(args.length < 1){ System.out.println("Usage: java Server_upload [port]"); System.exit(1); 32 } 33 port = Integer.parseInt(args[0]); 34 Server_upload ServerStart=new Server_upload(); 35 } 36 }

16 範例131：續3 檔案Client_upload.java： 37 import java.io.*;
38 import java.net.*; 39 public class Client_upload { 40 int i; 41 static String iaddr; 42 static int port; 43 static String uploadFile; 44 public Client_upload() { 45 try{ Socket cmdsocket=new Socket(InetAddress.getByName(iaddr),port); Socket datasocket=new Socket(InetAddress.getByName(iaddr),port);

17 範例131：續4 48 DataOutputStream cmdoutstream = new
DataOutputStream(cmdsocket.getOutputStream()); cmdoutstream.writeUTF(uploadFile); DataOutputStream dataoutstream = new DataOutputStream(datasocket.getOutputStream()); FileInputStream fis = new FileInputStream(uploadFile); while((i=fis.read()) !=-1) dataoutstream.writeInt(i); dataoutstream.writeInt(i); System.out.println("File is sent to internet successfully!"); cmdsocket.close(); datasocket.close(); }

18 範例131：續5 58 catch(IOException e){
System.out.println(e.getMessage()); } 61 } 62 public static void main(String args[]) { 63 if (args.length < 3){ System.out.println("USAGE: java Client_upload [iaddr] [port] [uploadFile]"); System.exit(1); 66 } 67 iaddr = args[0]; 68 port=Integer.parseInt(args[1]); 69 uploadFile = args[2]; 70 Client_upload ClientStart=new Client_upload(); 71 } 72 }

19 13-6 檔案下載(File Download) 設計範例132，從Client端對Server端所在目錄內之檔案執行下載(Download)。也即、當要對特定檔案執行網路下載時，將本例Client.class置於需求目錄內，再將本例Server.class置於遠端檔案群目錄內，依執行步驟從Client端對Server端目錄內之特定檔案執行下載。

20 範例132：設有檔案Server_download.java、Client_download.java其功能為解釋檔案下載之應用。
檔案Server_download.java： 01 import java.net.*; 02 import java.io.*; 03 public class Server_download { 04 static int port; 05 static String downloadFile; 06 int messagein, i; 07 public Server_download() { 08 try{ ServerSocket SS = new ServerSocket(port); System.out.println("Server_download is ready...");

21 範例132：續1 11 Socket cmdsocket = SS.accept();
Socket datasocket = SS.accept(); System.out.println("Client IP = " + cmdsocket.getInetAddress().getHostAddress()); DataInputStream cmdinstream = new DataInputStream(cmdsocket.getInputStream()); downloadFile = cmdinstream.readUTF(); DataOutputStream dataoutstream = new DataOutputStream(datasocket.getOutputStream()); FileInputStream fis = new FileInputStream(downloadFile); while((i=fis.read()) !=-1) dataoutstream.writeInt(i); dataoutstream.writeInt(i);

22 範例132：續2 System.out.println("File is sent to internet successfully!"); datasocket.close(); cmdsocket.close(); } catch(IOException e){ System.out.println(e.getMessage()); } 28 } 29 public static void main(String args[]){ 30 if(args.length < 1){ System.out.println("Usage: java Server_download [port]"); System.exit(1); 33 } port=Integer.parseInt(args[0]); Server_download ServerStart=new Server_download(); 36 } 37 }

23 範例132：續3 檔案Client_download.java： 38 import java.io.*;
39 import java.net.*; 40 public class Client_download { 41 int i; 42 static String iaddr; 43 static int port; 44 static String downloadFile; 45 int messagein; 46 public Client_download() { 47 try{ Socket cmdsocket=new Socket(InetAddress.getByName(iaddr),port); Socket datasocket=new Socket(InetAddress.getByName(iaddr),port);

24 範例132：續4 50 DataOutputStream cmdoutstream = new
DataOutputStream(cmdsocket.getOutputStream()); cmdoutstream.writeUTF(downloadFile); DataInputStream datainstream = new DataInputStream(datasocket.getInputStream()); FileOutputStream fos = new FileOutputStream(downloadFile); while(messagein != -1){ messagein = datainstream.readInt(); fos.write(messagein); } System.out.println("File is downloaded successfully!"); cmdsocket.close(); datasocket.close(); }

25 範例132：續5 62 catch(IOException e){
System.out.println(e.getMessage()); } 65 } 66 public static void main(String args[]) { 67 if (args.length < 3){ System.out.println("USAGE: java Client_download [iaddr] [port] [downloadFile]"); System.exit(1); 70 } 71 iaddr = args[0]; 72 port=Integer.parseInt(args[1]); 73 downloadFile = args[2]; 74 Client_download ClientStart=new Client_download(); 75 } 76 }