JavaSocket

基于tcp通信的socket

import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;/** 基于TCP通信的Socket，服务器端*/
public class Server{public static void main(String[] args) throws IOException {//1.创建ServerSocket，绑定端口ServerSocket serverSocket = new ServerSocket(3333);//2.时刻监听端口System.out.println("*****服务器已启动等待客户端连接*****");Socket socket = null;long count = 0;while(true){socket = serverSocket.accept();ServerThread serverThread = new ServerThread(socket);serverThread.start();count++;InetAddress address = socket.getInetAddress();System.out.println("客户端ip"+address.getHostAddress());System.out.println("客户端主机名"+address.getLocalHost());System.out.println("连接本机的数量"+count);}}
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;public class ServerThread extends Thread{Socket socket = null;//初始化public ServerThread(Socket socket){this.socket = socket;}@Overridepublic void run() {InputStream is=null;InputStreamReader isr=null;BufferedReader br=null;OutputStream os=null;PrintWriter pw=null;try {//1.获取输入流，获取客户端信息is = socket.getInputStream();isr = new InputStreamReader(is);br = new BufferedReader(isr);String info;while((info = br.readLine())!=null){      System.out.println("这里是服务端，客户端说："+info);}socket.shutdownInput();//注意shutdown的顺序//2.响应客户端os = socket.getOutputStream();pw = new PrintWriter(os);pw.write("我是服务端，欢迎您！");pw.flush();socket.shutdownOutput();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{//3.关闭资源try {if(pw!=null)pw.close();if(os!=null)os.close();       if(br!=null)br.close();if(isr!=null)isr.close();if(is!=null)is.close();if(socket!=null)socket.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;public class Client {public static void main(String[] args) throws UnknownHostException, IOException {//1.创建socket对象，绑定主机和端口Socket socket = new Socket("localhost", 3333);//2.获取输出流，发送信息OutputStream os = socket.getOutputStream();PrintWriter pw = new PrintWriter(os);pw.write("我是客户端1！");pw.flush();socket.shutdownOutput();//3.响应服务端InputStream is = socket.getInputStream();BufferedReader br = new BufferedReader(new InputStreamReader(is));String info;while((info=br.readLine())!=null){System.out.println("我是客户端，服务端说"+info);}socket.shutdownInput();//4.关闭资源br.close();is.close();pw.close();os.close();socket.close();}
}

基于udp通信的socket

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;/** 基于UDP通信的Socket，服务器端*/
public class UDPServer {public static void main(String[] args) throws IOException {/** 接受客户端信息*///1.创建服务器端，指定端口DatagramSocket socket = new DatagramSocket(4444);//2.创建数据包，接受客户端数据byte[] data = new byte[1024];DatagramPacket packet = new DatagramPacket(data, data.length);//3.接受客户端数据socket.receive(packet);//此方法在接受信息之前一直阻塞//4.读取数据String info = new String(data, 0, packet.getLength());System.out.println("我是服务器，客户端说"+info);/** 响应客户端*/InetAddress address = packet.getAddress();int port = packet.getPort();byte[] data1 = "欢迎您".getBytes();DatagramPacket packet2 = new DatagramPacket(data1, data1.length, address,port);socket.send(packet2);socket.close();}}

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.UnknownHostException;/** 客户端*/
public class UDPClient {public static void main(String[] args) throws IOException {/** 发送数据*///1.定义服务器地址端口号数据InetAddress address = InetAddress.getByName("localhost");int port=4444;byte[] data = "我是客户端".getBytes();//2.创建数据报，包含要发送的信息DatagramPacket packet = new DatagramPacket(data,data.length, address, port);//3.发送数据DatagramSocket socket = new DatagramSocket();socket.send(packet);/** 响应服务器数据*/byte[] data1 = new byte[1024];DatagramPacket packet1 = new DatagramPacket(data1, data1.length);//3.接受客户端数据socket.receive(packet1);//此方法在接受信息之前一直阻塞//4.读取数据String info = new String(data1, 0, packet1.getLength());System.out.println("我是客户端，服务端说"+info);socket.close();}
}

下面关于InetAddress和URL类的例子

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Arrays;public class Test1 {public static void main(String[] args) throws UnknownHostException {//获取本机InetAddress实例InetAddress  address = InetAddress.getLocalHost();System.out.println("计算机名"+address.getHostName());System.out.println("IP"+address.getHostAddress());//字节数组形式的IP地址byte[] bytes = address.getAddress();System.out.println("字节数组形式IP"+Arrays.toString(bytes));//根据机器名获取InetAddress实例InetAddress address2 = InetAddress.getByName("169.254.82.89");//InetAddress address2 = InetAddress.getByName("idea-PC");System.out.println("计算机名"+address2.getHostName());System.out.println("IP"+address2.getHostAddress());}
}

import java.net.MalformedURLException;
import java.net.URL;public class Test2 {public static void main(String[] args) throws MalformedURLException {//创建一个URL实例，注意+httpURL baidu = new URL("http://www.baidu.com");URL url = new URL(baidu, "/index.html?name=aa#image");System.out.println("协议："+url.getProtocol());System.out.println("主机："+url.getHost());System.out.println("文件路径："+url.getPath());System.out.println("文件："+url.getFile());System.out.println("相对路径："+url.getRef());System.out.println("查询字符串："+url.getQuery());//如果未指定端口号，则使用默认的端口号，返回值为-1System.out.println("端口号："+url.getPort());}
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;/** URL读取网络上内容*/
public class Test3 {public static void main(String[] args) throws IOException {URL url = new URL("http://www.baidu.com");InputStream is = url.openStream();InputStreamReader isr = new InputStreamReader(is,"utf-8");BufferedReader br = new BufferedReader(isr);String data = br.readLine();while(data!=null){System.out.println(data);data = br.readLine();}br.close();isr.close();is.close();}
}

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