TCP实现文件上传

package kuangs.lesson02;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

//服务器端
public class TcpServerDemo02 {
    public static void main(String[] args) throws Exception {
        //1.创建服务
        ServerSocket serverSocket = new ServerSocket(9000);
        //2.监听客户端的连接
        Socket socket = serverSocket.accept();//阻塞式监听,会一直等待客户端连接
        //3.获取输入流
        InputStream is = socket.getInputStream();

        //4.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);
        }
        //通知客户端接收完毕
        OutputStream os = socket.getOutputStream();
        os.write("我接受完毕了,可以断开了".getBytes());

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


    }
}

package kuangs.lesson02;

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

//客户端
public class TcpClientDemo02 {
    public static void main(String[] args) throws Exception {
        //1.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.读取文件
        FileInputStream fis = new FileInputStream(new File("lADPD3W5ONBVGtTNBDjNB4A_1920_1080.jpg"));
        //4.写出文件
        byte[] buffer = new byte[1024];
        int len;
        while ((len = fis.read(buffer)) != -1){
            os.write(buffer,0,len);
        }
        //通知服务器我已经接收完毕
        socket.shutdownOutput();// 我已经传输完了
        //确定服务器接收完毕,才能断开连接
        InputStream inputStream = socket.getInputStream();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer2 = new byte[1024];
        int len2;
        while ((len2 = inputStream.read(buffer2)) != -1){
            baos.write(buffer2,0,len2);
        }
        System.out.println(baos.toString());
        //关闭资源
        fis.close();
        inputStream.close();
        fis.close();
        os.close();
        socket.close();

    }
}

原文：https://www.cnblogs.com/nigustudent/p/14838597.html