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Java基于Socket文件傳輸示例 最近需要進(jìn)行網(wǎng)絡(luò)傳輸大文件，于是對基于socket的文件傳輸作了一個(gè)初步的了解。在一位網(wǎng)友提供的程序基礎(chǔ)上，俺進(jìn)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(shù)據(jù)輸入/輸出輸出流進(jìn)行包裝，加快傳輸?shù)乃俣?。廢話少說，先來看服務(wù)器端的程序。 1.服務(wù)器端  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(jìn)行傳輸?shù)奈募?/span> 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(jìn)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(tái)，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(xiàn)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(guān)閉socket鏈接哦，不然客戶端會(huì)等待server的數(shù)據(jù)過來， // 直到socket超時(shí)，導(dǎo)致數(shù)據(jù)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 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(chuàng)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 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(shè)置成服務(wù)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(wù)器成功!" + "\n"); return true; } catch (Exception e) { System.out.print("連接服務(wù)器失敗!" + "\n"); return false; } } private void sendMessage() { if (cs == null) return; try { cs.sendMessage(sendMessage); } catch (Exception e) { System.out.print("發(fā)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(cuò)誤\n"); return; } try { //本地保存路徑，文件名會(huì)自動(dòng)從服務(wù)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(jìn)度條本為圖形界面的prograssBar做的，這里如果是打文件，可能會(huì)重復(fù)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(cuò)誤" + "\n"); return; } } public static void main(String arg[]) { new ClientTest(); }}這就實(shí)現(xiàn)了從服務(wù)器端向客戶端發(fā)送文件的過程,當(dāng)然,反過來,也一樣.稍有不同.代碼中對跨平臺(tái)的細(xì)節(jié)沒有實(shí)現(xiàn),有時(shí)間或興趣的朋友可以提供一下. |
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}
