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限于個人能力，沒有能實現服務器端的多線程。

注冊、登錄、上傳文件到數據庫的功能基本都實現了。

源代碼：

https://pan.baidu.com/s/1TahTLXp2STzADhuehOMX5Q?pwd=13e5?

基于UDP的Socket通信實現多線程：

/**
*服務器端
*/
package?com.imooc.UDPTest;

import?java.io.IOException;
import?java.net.DatagramPacket;
import?java.net.DatagramSocket;
import?java.net.InetAddress;

public?class?Server?{
????public?static?void?main(String[]?args)?throws?IOException?{
????????//創建服務器端DatagramSocket,指定端口
????????DatagramSocket?socket=new?DatagramSocket(8800);
????????byte[]?data=new?byte[1024];
????????DatagramPacket?packet=new?DatagramPacket(data,data.length);
????????System.out.println("服務器端已經啟動，等待客戶端發送數據");
????????int?count=0;
????????while?(true){
????????????socket.receive(packet);//此方法在接收到數據包之前會一直堵塞
????????????Thread?serverThread=new?ServerThread(socket,packet,data);
????????????serverThread.start();
????????????InetAddress?address=packet.getAddress();
????????????System.out.println("當前客戶端IP:"+address.getHostAddress());
????????????count++;
????????????System.out.println("當前客戶端數量:"+count);
????????}

????}
}

/**
*服務器線程處理類
*/
package?com.imooc.UDPTest;

import?java.io.IOException;
import?java.net.DatagramPacket;
import?java.net.DatagramSocket;
import?java.net.InetAddress;


public?class?ServerThread?extends?Thread{
????DatagramSocket?socket=null;
????DatagramPacket?packet=null;
????byte[]?data=null;
????public?ServerThread(DatagramSocket?socket,DatagramPacket?packet,byte[]?data){
????????this.socket=socket;
????????this.packet=packet;
????????this.data=data;
????}
????public?void?run()?{
????????String?info=new?String(data,0,packet.getLength());
????????System.out.println("我是服務器，客戶端說:"+info);
????????InetAddress?address=packet.getAddress();
????????int?port=packet.getPort();
????????data="歡迎您".getBytes();
????????packet=new?DatagramPacket(data,data.length,address,port);
????????try?{
????????????socket.send(packet);
????????}?catch?(IOException?e)?{
????????????e.printStackTrace();
????????}


????}

}

/**
*客戶端
*/
package?com.imooc.UDPTest;

import?java.io.IOException;
import?java.net.DatagramPacket;
import?java.net.DatagramSocket;
import?java.net.InetAddress;

public?class?Client?{
????public?static?void?main(String[]?args)?throws?IOException?{
????????//定義服務器的地址、端口號、數據
????????InetAddress?address=InetAddress.getByName("DESKTOP-M8K8E0E");
????????int?port=8800;
????????byte[]?data="用戶名：admin;密碼:123".getBytes();
????????//創建數據報，包含發送的數據信息
????????DatagramPacket?packet=new?DatagramPacket(data,data.length,address,port);
????????//創建DatagramSocket對象
????????DatagramSocket?socket=new?DatagramSocket();
????????socket.send(packet);

????????byte[]?data1=new?byte[1024];
????????DatagramPacket?packet1=new?DatagramPacket(data1,data1.length);
????????socket.receive(packet1);
????????String?info=new?String(data1,0,packet1.getLength());
????????System.out.println("我是客戶端，服務器說:"+info);
????????socket.close();

????}
}

?對象

?

傳輸對象

傳遞

傳遞文件

四大類

ip地址和端口號組成了scoket

http超文件傳輸協議

兩臺計算機要想能夠進行 通信，需要滿足一些必要的條件

1. 唯一的標識：ip；用來標識自己的身份以及自己所處的地址

2. 需要共同的語言；即協議

3. 相應的端口號：每個主機上可以運行多個應用程序，使用端口號來決定與哪個應用進行通信

TCP/IP是目前世界上使用最為廣泛的協議

1. ????TCP（Transmission Control Protocol）傳輸控制協議
   

2. ????IP:Internet Protocol 互聯網協議

3. 
   

該套課程重點知識

UDP的兩個編程主要類

socket多客戶端通信

socket 通信模型和實現步驟