TCP文件上传实现

package lesson02;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;

public class TcpServerDemo02 {
    public static void main(String[] args) throws IOException {
        //1创建一个端口
        ServerSocket serverSocket = new ServerSocket(9000);
        //2监听发客户端的链接
        Socket socket = serverSocket.accept();
        //3获取输入流
        InputStream is = socket.getInputStream();


        //文件输出
        FileOutputStream fos = new FileOutputStream(new File("receive.jpg"));

        byte[] buffer = new byte[1024];
        int len;
        while ((len=is.read(buffer))!=-1){
            fos.write(buffer,0,len);

        }
        //通知客户端我接收完毕了
        OutputStream os=socket.getOutputStream();
        os.write("我接收完毕了".getBytes());

        //关闭资源
        fos.close();
        is.close();
        socket.close();
        serverSocket.close();

    }
}

---

package lesson02;

import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class TcpClientDemo02 {
    public static void main(String[] args) throws Exception {
        //创建一个socket连接
        Socket socket = new Socket(InetAddress.getByName("127.0.0.1"), 9000);
        //2创建一个输出流
        OutputStream os = socket.getOutputStream();
        //3.文件流
        FileInputStream fis = new FileInputStream(new File("lenna.jpg"));
        //写出文件
        byte[] buffer = new byte[1024];
        int len;
        while ((len=fis.read(buffer))!=-1){
            os.write(buffer,0,len);

        }
        //通知服务器，我已经结束了
        socket.shutdownOutput(); //我已经传输完了
        //确定服务器接收完毕，才能够重新连接
        InputStream inputStream=socket.getInputStream();
        //String byte[]
        ByteArrayOutputStream baos=new ByteArrayOutputStream();
        byte[] buffer2=new byte[2014];
        int len2;
        while ((len2=inputStream.read(buffer2))!=-1){
            baos.write(buffer2,0,len2);
        }


        System.out.println(baos.toString());

        //关闭资源
        baos.close();
        inputStream.close();
        fis.close();
        os.close();
        socket.close();

    }
}