本文實例講述了Java基于Socket的文件傳輸實現方法。分享給大家供大家參考，具體如下：
1. Java代碼如下：
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package sterning;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(); }} |
2.socket的Util輔助類
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package sterning;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) { } }} |
3.客戶端
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package sterning;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(); }} |
希望本文所述對大家Java程序設計有所幫助。
