本文实例介绍了Java基于Socket的文件传输案例，分享给大家供大家参考，具体内容如下

1、Java代码

package com.wf.demo.socket.socketfile; import java.net.*; import java.io.*; /** * 2.socket的Util辅助类 * * @author willson * */ 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 { } } // 发送消息 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 { } } // 接受消息 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 { } } // 关闭连接 public void shutDownConnection() { try { if (out != null) out.close(); if (getMessageStream != null) getMessageStream.close(); if (socket != null) socket.close(); } catch (Exception e) { } } }

2、Java代码

package com.wf.demo.socket.socketfile; 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; /** * 1.服务器端 * * @author willson * */ public class ServerTest { int port = 8821; void start() { Socket socket = null; try { ServerSocket serverSocket = new ServerSocket(port); while (true) { // 选择进行传输的文件 String filePath = "E:lib.zip"; File fi = new File(filePath); System.out.println("File Name：" + fi.getName() + ";tFile Size()：" + (int) fi.length() + "bytes"); // 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。 System.out.println("等待客户端连接，连接端口：" + port); socket = serverSocket.accept(); System.out.println("建立socket链接"); DataInputStream dis = new DataInputStream(new BufferedInputStream(socket.getInputStream())); dis.readByte(); DataInputStream fis = new DataInputStream(new BufferedInputStream(new FileInputStream(filePath))); DataOutputStream ps = new DataOutputStream(socket.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 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(); socket.close(); System.out.println("文件传输完成n"); } } catch (Exception e) { e.printStackTrace(); } } public static void main(String arg[]) { new ServerTest().start(); } }

3、客户端

package com.wf.demo.socket.socketfile; import java.io.BufferedOutputStream; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.FileOutputStream; /** * 3.客户端 * * @author willson * */ public class ClientTest { private ClientSocket cs = null; private String ip = "localhost";// 设置成服务器IP private int port = 8821; private String sendMessage = "Windwos"; public ClientTest() { try { if (createConnection()) { sendMessage(); getMessage("F:"); } } 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(String savePath) { 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。 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("File Size()：" + len + "bytes"); 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"); fileOut.write(buf, 0, read); } System.out.println("接收完成，文件存为" + savePath + "n"); fileOut.close(); } catch (Exception e) { System.out.println("接收消息错误" + "n"); return; } } public static void main(String arg[]) { new ClientTest(); } }

希望本文所述对大家学习java程序设计有所帮助。