自己动手写简单的web应用服务器（4）—利用socket实现文件的下载
直接上源码：
服务器：
1 package download; 2 3 import java.io.BufferedInputStream; 4 import java.io.BufferedOutputStream; 5 import java.io.File; 6 import java.io.FileInputStream; 7 import java.io.IOException; 8 import java.io.OutputStream; 9 import java.net.ServerSocket; 10 import java.net.Socket; 11 12 /** 13 * 目的：利用socket实现文件的下载。当有客户端连接到服务器时，自动从服务器上下载文件，客户端 14 * 按照系统毫秒数对下载的文件命名。 15 * 准备：服务器上准备要下载的文件d:/1.mp3。客户端接受文件后，将文件保存在d盘，文件采取系统毫秒数命名。 16 */ 17 public class Server { 18 19 private ServerSocket ss; 20 private int port = 8080;//服务器开放的端口号 21 /**利用构造方法，初始化ServerSocket*/ 22 public Server(){ 23 try { 24 ss = new ServerSocket(port); 25 } catch (IOException e) { 26 e.printStackTrace(); 27 } 28 } 29 /**服务器启动,等待客户端进入。当客户端进入，就产生socket对象，并将该对象交给线程去执行*/ 30 public void start(){ 31 while(true){ 32 try { 33 Socket s = ss.accept();//等待客户端进入 34 Thread thread = new Thread(new Handler(s));//利用构造器传参数 35 thread.run(); 36 } catch (IOException e) { 37 e.printStackTrace(); 38 } 39 } 40 } 41 private class Handler implements Runnable { 42 private Socket s; 43 private byte[] buf = new byte[1024];//1K大小的缓冲区 44 public Handler(Socket s) { 45 this.s = s; 46 } 47 48 public void run() { 49 try { 50 File sourceFile = new File("d:/1.mp3"); 51 FileInputStream fis = new FileInputStream(sourceFile); 52 BufferedInputStream bis = new BufferedInputStream(fis); 53 OutputStream os = s.getOutputStream(); 54 BufferedOutputStream bos = new BufferedOutputStream(os); 55 int size = -1; 56 while((size=bis.read(buf))!=-1){ 57 bos.write(buf,0,size); 58 bos.flush(); 59 } 60 s.close(); 61 fis.close(); 62 } catch (Exception e) { 63 e.printStackTrace(); 64 } 65 } 66 67 } 68 public static void main(String[] args) { 69 Server s = new Server(); 70 s.start(); 71 } 72 }
客户端：
1 package download; 2 3 import java.io.BufferedInputStream; 4 import java.io.BufferedOutputStream; 5 import java.io.File; 6 import java.io.FileOutputStream; 7 import java.io.IOException; 8 import java.io.InputStream; 9 import java.net.Socket; 10 import java.net.UnknownHostException; 11 /**客户端程序，负责从客户端下载文件*/ 12 public class Client { 13 private Socket s; 14 private byte[] buf = new byte[1024];//1K大小的缓冲区 15 16 public void start(){ 17 try { 18 s = new Socket("192.168.1.103", 8080); 19 String fileName = "d:/"+System.currentTimeMillis()+".mp3"; 20 File targetFile = new File(fileName); 21 targetFile.createNewFile(); 22 FileOutputStream fos = new FileOutputStream(targetFile); 23 BufferedOutputStream bos = new BufferedOutputStream(fos); 24 InputStream is = s.getInputStream(); 25 BufferedInputStream bis = new BufferedInputStream(is); 26 int size = -1; 27 while((size=bis.read(buf))!=-1){ 28 bos.write(buf,0,size); 29 bos.flush(); 30 } 31 s.close(); 32 fos.close(); 33 } catch (UnknownHostException e) { 34 e.printStackTrace(); 35 } catch (IOException e) { 36 e.printStackTrace(); 37 } 38 } 39 public static void main(String[] args) { 40 Client c = new Client(); 41 c.start(); 42 } 43 }
