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限于個(gè)人能力，沒有能實(shí)現(xiàn)服務(wù)器端的多線程。

注冊(cè)、登錄、上傳文件到數(shù)據(jù)庫的功能基本都實(shí)現(xiàn)了。

源代碼：

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

基于UDP的Socket通信實(shí)現(xiàn)多線程：

/**
*服務(wù)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(chuàng)建服務(wù)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(wù)器端已經(jīng)啟動(dòng)，等待客戶端發(fā)送數(shù)據(jù)");
????????int?count=0;
????????while?(true){
????????????socket.receive(packet);//此方法在接收到數(shù)據(jù)包之前會(huì)一直堵塞
????????????Thread?serverThread=new?ServerThread(socket,packet,data);
????????????serverThread.start();
????????????InetAddress?address=packet.getAddress();
????????????System.out.println("當(dāng)前客戶端IP:"+address.getHostAddress());
????????????count++;
????????????System.out.println("當(dāng)前客戶端數(shù)量:"+count);
????????}

????}
}

/**
*服務(wù)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(wù)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(wù)器的地址、端口號(hào)、數(shù)據(jù)
????????InetAddress?address=InetAddress.getByName("DESKTOP-M8K8E0E");
????????int?port=8800;
????????byte[]?data="用戶名：admin;密碼:123".getBytes();
????????//創(chuàng)建數(shù)據(jù)報(bào)，包含發(fā)送的數(shù)據(jù)信息
????????DatagramPacket?packet=new?DatagramPacket(data,data.length,address,port);
????????//創(chuàng)建DatagramSocket對(duì)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(wù)器說:"+info);
????????socket.close();

????}
}

?對(duì)象

?

傳輸對(duì)象

傳遞

傳遞文件

四大類

ip地址和端口號(hào)組成了scoket

http超文件傳輸協(xié)議

兩臺(tái)計(jì)算機(jī)要想能夠進(jìn)行 通信，需要滿足一些必要的條件

1. 唯一的標(biāo)識(shí)：ip；用來標(biāo)識(shí)自己的身份以及自己所處的地址

2. 需要共同的語言；即協(xié)議

3. 相應(yīng)的端口號(hào)：每個(gè)主機(jī)上可以運(yùn)行多個(gè)應(yīng)用程序，使用端口號(hào)來決定與哪個(gè)應(yīng)用進(jìn)行通信

TCP/IP是目前世界上使用最為廣泛的協(xié)議

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

2. ????IP:Internet Protocol 互聯(lián)網(wǎng)協(xié)議

3. 
   

該套課程重點(diǎn)知識(shí)

UDP的兩個(gè)編程主要類

socket多客戶端通信

socket 通信模型和實(shí)現(xiàn)步驟