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			Java基于Socket文件傳輸示例
		
          
		
          最近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
          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
          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
          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();
          }
          }
          　　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,有時間或興趣的朋友可以提供一下.
          
		
          
			posted on 2014-06-03 09:54 順其自然EVO 閱讀(197) 評論(0)  編輯  收藏  所屬分類: 測試學習專欄 
		
          
	
          
	
	


	


          
	    
    




          








          

				
			
          
			
          
				
					
          
	
          
		
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