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客户端： 

package com.tencent.network;import java.io.*;import java.net.InetAddress;import java.net.Socket;public class FileClient {    public static void main(String[] args) {        try {            // 建立连接            Socket socket = new Socket(InetAddress.getByName("127.0.0.1") , 9000);            // 输出流            OutputStream os = socket.getOutputStream();            // 文件输入流            FileInputStream fs = new FileInputStream(new File("./file.out"));            // 缓冲区  依次写入  输出流            byte[] buffer = new byte[1024];            int len = 0;            while((len = fs.read(buffer)) != -1) {                os.write(buffer , 0 , len);            }            //通知服务器  我传输完了!            socket.shutdownOutput();            // 确认服务器接收完毕   输入流            InputStream is = socket.getInputStream();            ByteArrayOutputStream bo = new ByteArrayOutputStream();            byte[] buffer2 = new byte[1024];            int len2 = 0;            while((len2 = is.read(buffer2)) != -1) {                bo.write(buffer2 , 0 , len2);            }            System.out.println(bo.toString());            // 关闭资源            fs.close();            os.close();            socket.close();        } catch (Exception e ) {            e.printStackTrace();        }    }}

服务端：

package com.tencent.network;import java.io.*;import java.net.ServerSocket;import java.net.Socket;public class FileServer {    public static void main(String[] args) {        try {            // 创建服务socket            ServerSocket serverSocket = new ServerSocket(9000);            // 阻塞式监听   会一直等待客户端发送信息            Socket socket = serverSocket.accept();            // 输入流            InputStream is = socket.getInputStream();            // 文件输出流            FileOutputStream fos = new FileOutputStream(new File("new"));            //把文件的输出流到输入流去            int len = 0;            byte[] buffer = new byte[1024];            while((len = is.read(buffer)) != -1) {                fos.write(buffer , 0 , len);            }            OutputStream os = socket.getOutputStream();            os.write("我接收完毕了，你可以断开了".getBytes());            // 关闭资源            fos.close();            is.close();            socket.close();            serverSocket.close();        } catch (IOException e) {            e.printStackTrace();        }    }}

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