文件传输(基于SOCKET编程).doc

服务器端：package sterning; import java.io.BufferedInputStream; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.File; import java.io.FileInputStream; import .ServerSocket; import .Socket; public class ServerTest int port = 8821; void start() Socket s = null; try ServerSocket ss = new ServerSocket(port); while (true) / 选择进行传输的文件String filePath = D:lib.rar; File fi = new File(filePath); System.out.println(文件长度: + (int) fi.length(); / public Socket accept() throws/ IOException侦听并接受到此套接字的连接。此方法在进行连接之前一直阻塞。s = ss.accept(); System.out.println(建立socket链接); 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(); /将文件名及长度传给客户端。这里要真正适用所有平台，例如中文名的处理，/还需要加工，具体可以参见Think In Java 4th里有现成的代码。ps.writeUTF(fi.getName(); ps.flush(); ps.writeLong(long) fi.length(); ps.flush(); int bufferSize = 8192; byte buf = new bytebufferSize; while (true) int read = 0; if (fis != null) read = fis.read(buf); if (read = -1) break; ps.write(buf, 0, read); ps.flush(); / 注意关闭socket链接哦，不然客户端会等待server的数据过来，/ 直到socket超时，导致数据不完整。 fis.close(); s.close(); System.out.println(文件传输完成); catch (Exception e) e.printStackTrace(); public static void main(String arg) new ServerTest().start(); 2.sooket 的Util类package sterning; import .*; 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; /* */* 创建socket连接* * 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.客户端：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; / 设置成服务器IPprivate 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(连接服务器成功! + n); return true; catch (Exception e) System.out.print(连接服务器失败! + n); return false; private void sendMessage() if (cs = null)return; try cs.sendMessage(sendMessage); catch (Exception e) System.out.print(发送消息失败! + n); private void getMessage() if (cs = null)return; DataInputStream inputStream = null; try inputStream = cs.getMessageStream(); catch (Exception e) System.out.print(接收消息缓存错误n); return; try /本地保存路径，文件名会自动从服务器端继承而来。String savePath = E:; int bufferSize = 8192; byte buf = new bytebufferSize; 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(文件的长度为: + len + n); System.out.println(开始接收文件! + n); while (true) int read = 0; if (inputStream != null) read = inputStream.read(buf); passedlen += read; if (read = -1) break; /下面进度条本为图形界面的prograssBar做的，这里如果是打文件，/可能会重复打印出一些相同的百分比System.out.println(文件接收了 + (passedlen * 100/ len) + %n