Java基于Socket文件傳輸示例
需要進行網絡傳輸大文件，于是對基于socket的文件傳輸作了一個初步的了解。在一位網友提供的程序基礎上，俺進行了一些加工，采用了緩沖輸入/輸出流來包裝輸出流，再采用數據輸入/輸出輸出流進行包裝，加快傳輸的速度。廢話少說，先來看服務器端的程序。
1.服務器端
import java.io.BufferedInputStream; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.File; import java.io.FileInputStream; import java.net.ServerSocket; import java.net.Socket;public class ServerTest { int port = 8821 ;
void start() { Socket s = null ; try { ServerSocket ss = new ServerSocket(port); while ( true ) { // 選擇進行傳輸的文件 String filePath = " D://lib.rar " ; File fi = new File(filePath); System.out.println( " 文件長度: " + ( int ) fi.length()); // public Socket accept() throws // IOException偵聽并接受到此套接字的連接。此方法在進行連接之前一直阻塞。 s = ss.accept(); System.out.println( " 建立socket鏈接 " ); DataInputStream dis = new DataInputStream( new BufferedInputStream(s.getInputStream())); dis.readByte(); DataInputStream fis = new DataInputStream( new BufferedInputStream( new FileInputStream(filePath))); DataOutputStream ps = new DataOutputStream(s.getOutputStream()); // 將文件名及長度傳給客戶端。這里要真正適用所有平臺，例如中文名的處理，還需要加工，具體可以參見Think In Java 4th里有現成的代碼。 ps.writeUTF(fi.getName()); ps.flush(); ps.writeLong(( long ) fi.length()); ps.flush(); int bufferSize = 8192 ; byte [] buf = new byte [bufferSize]; while ( true ) { int read = 0 ; if (fis != null ) { read = fis.read(buf); } if (read == - 1 ) { break ; } ps.write(buf, 0 , read); } ps.flush(); // 注意關閉socket鏈接哦，不然客戶端會等待server的數據過來， // 直到socket超時，導致數據不完整。 fis.close(); s.close(); System.out.println( " 文件傳輸完成 " ); } } catch (Exception e) { e.printStackTrace(); } } public static void main(String arg[]) { new ServerTest().start(); }}</pre> 2.socket的Util輔助類
import java.net. ; import java.io. ;public class ClientSocket { private String ip;
private int port; private Socket socket = null ; DataOutputStream out = null ; DataInputStream getMessageStream = null ; public ClientSocket(String ip, int port) { this .ip = ip; this .port = port; } /** * 創建socket連接 * * @throws Exception * exception */ public void CreateConnection() throws Exception { try { socket = new Socket(ip, port); } catch (Exception e) { e.printStackTrace(); if (socket != null ) socket.close(); throw e; } finally { } } public void sendMessage(String sendMessage) throws Exception { try { out = new DataOutputStream(socket.getOutputStream()); if (sendMessage.equals( " Windows " )) { out.writeByte( 0x1 ); out.flush(); return ; } if (sendMessage.equals( " Unix " )) { out.writeByte( 0x2 ); out.flush(); return ; } if (sendMessage.equals( " Linux " )) { out.writeByte( 0x3 ); out.flush(); } else { out.writeUTF(sendMessage); out.flush(); } } catch (Exception e) { e.printStackTrace(); if (out != null ) out.close(); throw e; } finally { } } public DataInputStream getMessageStream() throws Exception { try { getMessageStream = new DataInputStream( new BufferedInputStream(socket.getInputStream())); return getMessageStream; } catch (Exception e) { e.printStackTrace(); if (getMessageStream != null ) getMessageStream.close(); throw e; } finally { } } public void shutDownConnection() { try { if (out != null ) out.close(); if (getMessageStream != null ) getMessageStream.close(); if (socket != null ) socket.close(); } catch (Exception e) { } }}</pre>3.客戶端
import java.io.BufferedOutputStream; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.FileOutputStream;public class ClientTest { private ClientSocket cs = null ;
private String ip = " localhost " ; // 設置成服務器IP private int port = 8821 ; private String sendMessage = " Windwos " ; public ClientTest() { try { if (createConnection()) { sendMessage(); getMessage(); } } catch (Exception ex) { ex.printStackTrace(); } } private boolean createConnection() { cs = new ClientSocket(ip, port); try { cs.CreateConnection(); System.out.print( " 連接服務器成功! " + " /n " ); return true ; } catch (Exception e) { System.out.print( " 連接服務器失敗! " + " /n " ); return false ; } } private void sendMessage() { if (cs == null ) return ; try { cs.sendMessage(sendMessage); } catch (Exception e) { System.out.print( " 發送消息失敗! " + " /n " ); } } private void getMessage() { if (cs == null ) return ; DataInputStream inputStream = null ; try { inputStream = cs.getMessageStream(); } catch (Exception e) { System.out.print( " 接收消息緩存錯誤/n " ); return ; } try { // 本地保存路徑，文件名會自動從服務器端繼承而來。 String savePath = " E:// " ; int bufferSize = 8192 ; byte [] buf = new byte [bufferSize]; int passedlen = 0 ; long len = 0 ; savePath += inputStream.readUTF(); DataOutputStream fileOut = new DataOutputStream( new BufferedOutputStream( new BufferedOutputStream( new FileOutputStream(savePath)))); len = inputStream.readLong(); System.out.println( " 文件的長度為: " + len + " /n " ); System.out.println( " 開始接收文件! " + " /n " ); while ( true ) { int read = 0 ; if (inputStream != null ) { read = inputStream.read(buf); } passedlen += read; if (read == - 1 ) { break ; } // 下面進度條本為圖形界面的prograssBar做的，這里如果是打文件，可能會重復打印出一些相同的百分比 System.out.println( " 文件接收了 " + (passedlen * 100 / len) + " %/n " ); fileOut.write(buf, 0 , read); } System.out.println( " 接收完成，文件存為 " + savePath + " /n " ); fileOut.close(); } catch (Exception e) { System.out.println( " 接收消息錯誤 " + " /n " ); return ; } } public static void main(String arg[]) { new ClientTest(); }} </pre>
這就實現了從服務器端向客戶端發送文件的過程,當然,反過來,也一樣.稍有不同.代碼中對跨平臺的細節沒有實現,
本文由用戶 jopen 自行上傳分享，僅供網友學習交流。所有權歸原作者，若您的權利被侵害，請聯系管理員。
轉載本站原創文章，請注明出處，并保留原始鏈接、圖片水印。
本站是一個以用戶分享為主的開源技術平臺，歡迎各類分享！