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package?com.study.socket;
import?javax.sound.sampled.Port;
import?java.io.IOException;
import?java.net.*;
/**
?*?UDP?Client客服端
?*/
public?class?UDPClient?{
????public?static?void?main(String[]?args)?throws?IOException?{
????????//1.定義消息?服務端ip地址?端口號
????????String?msg?=?"用戶名：sw;密碼：123456";
????????InetAddress?address?=?InetAddress.getByName("DESKTOP-VQBUTGQ");
????????int?port?=?8000;
????????//2.創建數據報
????????byte[]?data?=?msg.getBytes();
????????DatagramPacket?packet?=?new?DatagramPacket(data,?data.length,?address?,?port?);
????????//3.創建socket
????????DatagramSocket?socket?=??new?DatagramSocket();
????????//4.發送消息
????????socket.send(packet);
????????//5.接收反饋信息
????????byte[]?data1?=?new?byte[1024];
????????DatagramPacket?packet1?=?new?DatagramPacket(data1?,?0?,?data1.length);
????????socket.receive(packet1);
????????String?rt?=?new?String(data1,0,packet1.getLength());
????????System.out.println("這是客戶端，服務端反饋信息為：?"?+?rt);
????????//5.釋放資源
????????socket.close();
????}
}

package?com.study.socket;

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

/**
*?UDP?服務器端
*/
public?class?UDPServer?{
???public?static?void?main(String[]?args)?{
???????try?{
???????????//1.建立socket并制定端口號
???????????DatagramSocket?socket?=?new?DatagramSocket(8000);
???????????int?num?=?0;
???????????while?(true){
???????????????UDPServerThread?thread?=?new?UDPServerThread(socket);
???????????????thread.setPriority(4);
???????????????thread.run();
???????????????num++;
???????????????System.out.println("服務器端接受了?"?+?num?+?"?個客戶端請求！");
???????????}
???????}?catch?(SocketException?e)?{
???????????e.printStackTrace();
???????}?catch?(IOException?e)?{
???????????e.printStackTrace();
???????}
???}
}

package?com.study.socket;

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

/**
*?UDP?server?多線程實現
*/
public?class?UDPServerThread?extends?Thread{

???DatagramSocket?socket?=?null;

???public?UDPServerThread(DatagramSocket?socket){
???????this.socket?=?socket;
???}

???@Override
???public?void?run()?{
???????try?{
???????????byte[]?data?=?new?byte[1024];
???????????DatagramPacket?packet?=?new?DatagramPacket(data,data.length);
???????????//3.接收客戶端發送的數據信息
???????????socket.receive(packet);//此方法在接收到數據報之前一直阻塞
???????????//4.讀取數據報信息
???????????String?msg?=?new?String(data,0,packet.getLength());
???????????System.out.println("UDP?server服務器接收到的信息：?"?+?msg);
???????????//5.反饋信息
???????????String?rt?=?"歡迎您!";
???????????byte[]?data1?=?rt.getBytes();
???????????InetAddress?address?=?packet.getAddress();
???????????int?port?=?packet.getPort();
???????????DatagramPacket?packet1?=?new?DatagramPacket(data1,?data1.length?,?address?,?port?);
???????????socket.send(packet1);
???????}?catch?(IOException?e)?{
???????????e.printStackTrace();
???????}
???}
}

package?com.study.socket;

import?java.io.IOException;
import?java.io.OutputStreamWriter;
import?java.io.PrintWriter;
import?java.net.Socket;
/**
*?socket編程模擬客服端
*/
public?class?Client?{
???public?static?void?main(String[]?args)?{
???????//1.創建客戶端socket
???????Socket?socket?=?null;
???????try?{
???????????socket?=?new?Socket("127.0.0.1",8888);
???????????//2.獲取輸出流
???????????OutputStreamWriter?osw?=?new?OutputStreamWriter(socket.getOutputStream());
???????????PrintWriter?pw?=?new?PrintWriter(osw);
???????????pw.write("用戶名：polly;密碼：809");
???????????pw.flush();
???????????//4.釋放資源
???????????pw.close();
???????????osw.close();
???????????socket.close();
???????}?catch?(IOException?e)?{
???????????e.printStackTrace();
???????}
???}
}

package?com.study.socket;

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

/**
*?socket編程模擬服務器端
*/
public?class?Server?{

???public?static?void?main(String[]?args)?{
???????try?{
???????????//1.建立服務端socket
???????????ServerSocket?serverSocket?=?new?ServerSocket(8888);
???????????int?num?=?0;
???????????while(true){
???????????????//2.監聽端口
???????????????Socket?socket?=?serverSocket.accept();
???????????????ServerThread?st?=?new?ServerThread(socket);
???????????????st.setPriority(4);//設置線程的優先級，范圍是【1,10】??默認是5
???????????????st.start();
???????????????num++;
???????????????System.out.println("服務器端接受?"?+?num?+?"?個客戶端請求！");
???????????}
???????}?catch?(IOException?e)?{
???????????e.printStackTrace();
???????}

???}
}

package?com.study.socket;

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

/**
*?服務器線程實現
*/
public?class?ServerThread?extends?Thread?{
???Socket?socket?=?null;

???public?ServerThread(Socket?socket){
???????this.socket?=?socket;
???}

???@Override
???public?void?run()?{
???????if(socket?!=?null){
???????????//讀取輸入流
???????????InputStream?is?=?null;
???????????InputStreamReader?isr?=?null;
???????????BufferedReader?br?=?null;
???????????OutputStreamWriter?osw?=?null;
???????????PrintWriter?pw?=?null;
???????????try?{
???????????????is?=?socket.getInputStream();
???????????????isr?=?new?InputStreamReader(is);
???????????????br?=?new?BufferedReader(isr);
???????????????System.out.println("服務器讀取客戶端信息："?+?socket.getLocalAddress()?+?"?:?"?+
???????????????????????socket.getLocalPort()??+?"?"?+?br.readLine());
???????????????//返回響應流
???????????????osw?=?new?OutputStreamWriter(socket.getOutputStream());
???????????????pw?=?new?PrintWriter(osw);
???????????????pw.write("請求已接到！");
???????????????pw.flush();

???????????}?catch?(IOException?e)?{
???????????????e.printStackTrace();
???????????}?finally?{
???????????????//關閉資源
???????????????try?{
???????????????????if(pw?!=?null)??pw.close();
???????????????????if(osw?!=?null)??osw.close();
???????????????????if(br?!=?null)??br.close();
???????????????????if(isr?!=?null)??isr.close();
???????????????????if(is?!=?null)??is.close();
???????????????????if(socket?!=?null)??socket.close();
???????????????}?catch?(IOException?e)?{
???????????????????e.printStackTrace();
???????????????}
???????????}
???????}
???}
}

基于udp通信：

Socket socket=serverSocket.accept();

1. URL--統一資源定位符=協議名稱：資源名稱
   

2. java.net提供URL類表示URL? ?

1.URL類中的常用方法：

//創建一個URL對象

? ? URL url = new URL("http://www.baidu.com");??

? ? URL url1 = new URL(url, "/index.html?usrname=lqq#test");

//url的常用方法

? ? System.out.println("URL主機名稱："+url1.getHost());

? ? System.out.println("URL協議："+url1.getProtocol());

? ? System.out.println("URL端口："+url1.getPort());

? ? System.out.println("URL文件路徑:"+url1.getPath());

? ? System.out.println("URL查詢字符串："+url1.getQuery());

? ? System.out.println("URL相對路徑："+url1.getRef());

? ? System.out.println("URL文件名："+url1.getFile());? ?

2.通過URL獲取html文件內容：

public static void main(String[] args) throws IOException {
? ?URL url=new URL("http://www.snnu.edu.cn");
? ?InputStream is =url.openStream();
? ?InputStreamReader isr=new InputStreamReader(is);
? ?BufferedReader bufferedReader = new BufferedReader(isr);
? ?String data=bufferedReader.readLine();
? ?while (data!=null){
? ? ? ?System.out.println(data);
? ? ? ?data=bufferedReader.readLine();
? ?}
? ?bufferedReader.close();
? ?isr.close();
? ?is.close();
}

網絡基礎知識

地址、端口號、協議

java 提供的網絡功能有四大類

1. InetAddress ：用于標識網絡上的硬件資源

2. URL：統一資源定位符 通過URL可以直接讀取或寫入網絡上的數據

3. Sockets：使用TCP協議實現網絡通信的Socket相關的類

4. Datagram：使用UDP協議，將數據保存在數據報中，通過網絡進行通信。
   

?

通信模型啊

InetAddress.getLocalhost();獲取InetAddress實例

Socket編程

1、網絡基礎知識

2、InetAddress類

3、URL

4、TCP編程(Socket)

5、UDP編程(Datagram)

IP、端口、協議（共同語言）

tcp/ip模型?物理層、數據鏈路層、網絡層、傳輸層、應用層

端口號范圍0~65535,0~1023為系統保留

Java網絡功能四大類：InetAddress、URL、Socket、Datagram

多線程的知識點

Socket通信模型

實際應用時是以對象的形式進行傳輸

不必關閉輸入輸出流