IO流 之 文件上传

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();
        }
    }
}