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Java——Java网络

tonglin0325

1.IP和InetAddress#

 

 

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import java.net.InetAddress;

public class InetAddress_demo {

	public static void main(String[] args) throws Exception{
		// TODO 自动生成的方法存根
		InetAddress locAdd = null;			//声明InetAddress对象
		InetAddress remAdd = null;			//声明InetAddress对象
		
		locAdd = InetAddress.getLocalHost();		//得到本地的InetAddress对象
		remAdd = InetAddress.getByName("www.baidu.com");
		
		System.out.println("本机的IP地址："+locAdd.getHostAddress());
		System.out.println("远程的IP地址："+remAdd.getHostAddress());
		System.out.println("本机是否可达："+locAdd.isReachable(5000));
	}

}

2.URLConnection,URLEncoder和URLDecoder#

1.使用URL读取内容#

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import java.awt.im.InputContext;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;

public class URL_demo {

	public static void main(String[] args) throws Exception {
		// TODO 自动生成的方法存根
		URL url = new URL("http","10.108.84.220",8080,"/Hello/Hello.html");	//指定操作的URL
		InputStream input = url.openStream();			//打开输入流，读取URL内容
		Scanner scan = new Scanner(input);				//实例化读取分隔符
		scan.useDelimiter("\n");				//设置读取分隔符
		while(scan.hasNext()){
			System.out.println(scan.next());
		}
	}

}

 

2.取得URL的基本信息#

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import java.net.URL;
import java.net.URLConnection;

public class URL_demo {

	public static void main(String[] args) throws Exception {
		// TODO 自动生成的方法存根
		
		URL url = new URL("http://www.baidu.com");
		URLConnection urlCon = url.openConnection();	//建立连接
		System.out.println("内容大小："+urlCon.getContentLength()); //取得内容大小
		System.out.println("内容类型："+urlCon.getContentType());		//取得内容类型
	}

}

 

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import java.net.URLDecoder;
import java.net.URLEncoder;

public class URL_demo {

	public static void main(String[] args) throws Exception {
		// TODO 自动生成的方法存根
		
		String keyWord = "张三";
		String encod = URLEncoder.encode(keyWord,"UTF-8");	//对内容进行编码
		System.out.println("编码之后的内容："+encod);
		String decod = URLDecoder.decode(keyWord,"UTF-8");	//对内容进行编码
		System.out.println("解码之后的内容："+decod);
	}

}

 输出

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编码之后的内容：%E5%BC%A0%E4%B8%89
解码之后的内容：张三
　　

3.TCP#

 

 

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

public class HelloServer_demo {

	public static void main(String[] args) throws Exception{
		// TODO 自动生成的方法存根
		ServerSocket server = null; 			//声明ServerSocket对象
		Socket client = null;							//一个Socket对象表示一个客户端
		PrintStream out = null;					//声明打印流对象，以向客户端输出
		server = new ServerSocket(8888);	//表示服务器在8888端口上等待客户端的访问
		System.out.println("服务器运行，等待客户端连接");
		client = server.accept();					//程序阻塞，等待客户端连接
		String str = "HelloWord";					//要向客户端输出信息
		out = new PrintStream(client.getOutputStream());	//实例化打印流对象，输出信息
		out.println(str);
		out.close();
		client.close();
		server.close();
	}

}

 

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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.Socket;

public class HelloClient_demo {

	public static void main(String[] args) throws Exception{
		// TODO 自动生成的方法存根
		Socket client = null;									//声明Socket对象
		client = new Socket("localhost",8888);	//指定连接的主机和端口
		BufferedReader buf = null;					//声明BufferedReader对象，接受信息
		//指定客户端的输入流
		buf = new BufferedReader(new InputStreamReader(client.getInputStream()));
		String str = buf.readLine();
		System.out.println("服务器输出的内容是"+str);
		client.close();
		buf.close();
	}

}

 

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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;

public class EchoServer_demo {

	public static void main(String[] args) throws Exception{
		// TODO 自动生成的方法存根
		ServerSocket server = null; 			//声明ServerSocket对象
		Socket client = null;							//一个Socket对象表示一个客户端
		PrintStream out = null;					//声明打印流对象，以向客户端输出
		BufferedReader buf = null;					//声明BufferedReader对象，接受信息
		server = new ServerSocket(8888);	//表示服务器在8888端口上等待客户端的访问
		boolean f = true;
		while(f){
			System.out.println("服务器运行，等待客户端连接：");
			client = server.accept();				//接收客户端连接
			//得到客户端的输入信息
			buf = new BufferedReader(new InputStreamReader(client.getInputStream()));
			//实例化客户端的输出流
			out = new PrintStream(client.getOutputStream());
			boolean flag = true;
			while(flag){
				String str = buf.readLine();				//在此处不断地接收信息
				if(str == null || "".equals(str)){
					flag = false;
				}else{
					if("bye".equals(str)){
						flag = false;
					}else{
						out.print("ECHO"+str);
					}
				}
			}
			out.close();
			client.close();
		}
		server.close();
	}
}

 

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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;

public class EchoClient_demo {

	public static void main(String[] args) throws Exception{
		// TODO 自动生成的方法存根
		Socket client = null;									//声明Socket对象
		client = new Socket("localhost",8888);	//指定连接的主机和端口
		BufferedReader buf = null;					//声明BufferedReader对象，接受信息
		PrintStream out = null;							//输出流，向服务器端发送信息
		BufferedReader input = null;				//声明BufferedReader对象
		//从键盘接收数据
		input = new BufferedReader(new InputStreamReader(System.in));
		//向服务器端输出信息
		out = new PrintStream(client.getOutputStream());
		//接收服务器端输入信息
		buf = new BufferedReader(new InputStreamReader(client.getInputStream()));
		boolean flag = true;

		while(flag){
			System.out.print("输入信息：");
			String str = input.readLine();				//从键盘接收数据
			out.println(str);

			if("bye".equals(str)){
				flag = false;
			}else{
				String echo = buf.readLine();
				System.out.println(echo);
			}
		}
		client.close();
		buf.close();
	}
}

 

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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;

class EchoThreadServer implements Runnable{
	private Socket client = null;
	
	public EchoThreadServer(Socket client){
		this.client = client;
	}
	
	@Override
	public void run() {
		// TODO 自动生成的方法存根
		PrintStream out = null;					//声明打印流对象，以向客户端输出
		BufferedReader buf = null;					//声明BufferedReader对象，接受信息
		
		try{
			//得到客户端的输入信息
			buf = new BufferedReader(new InputStreamReader(client.getInputStream()));
			//实例化客户端的输出流
			out = new PrintStream(client.getOutputStream());
			boolean flag = true;
		
			while(flag){
				String str = buf.readLine();				//在此处不断地接收信息
				if(str == null || "".equals(str)){
					flag = false;
				}else{
					if("bye".equals(str)){
						flag = false;
					}else{
						out.print("ECHO"+str);
					}
				}
		}
		out.close();
		client.close();
	}catch(Exception e){
		}
	}
}

public class EchoThreadServer_demo {

	public static void main(String[] args) throws Exception{
		// TODO 自动生成的方法存根
		ServerSocket server = null;
		Socket client = null;
		server = new ServerSocket(8888);
		boolean f = true;
		while(f){
			System.out.println("服务器运行，等待客户端连接：");
			client = server.accept();
			new Thread(new EchoThreadServer(client)).start();
		}
		server.close();
	}

}

4.UDP#

 UDP server

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import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UDPServer_demo {

	public static void main(String[] args) throws Exception{
		// TODO 自动生成的方法存根
		DatagramSocket ds = null;					//声明DatagramSocket对象
		DatagramPacket dp = null;					//声明DatagramPacket对象
		ds = new DatagramSocket(3000);
		String str = "HelloWord";
		dp = new DatagramPacket(str.getBytes(),str.length(),InetAddress.getByName("localhost"),9000);
		System.out.println("发送信息");
		ds.send(dp);
		ds.close();
	}

}

 UDP client

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import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class UDPClient_demo {

	public static void main(String[] args) throws Exception{
		// TODO 自动生成的方法存根
		DatagramSocket ds = null;					//声明DatagramSocket对象
		byte[] buf = new byte[1024];			//定义接收数据的字节数据
		DatagramPacket dp = null;					//声明DatagramPacket对象
		ds = new DatagramSocket(9000);		//此客户端在9000端口监听
		dp = new DatagramPacket(buf,1024);			//指定接收数据的长度为1024
		System.out.println("等待接收数据");
		ds.receive(dp); 				//接收数据
		String str = new String(dp.getData(),0,dp.getLength())+" from"
		+dp.getAddress().getHostAddress()+" : "+dp.getPort();	//接收数据
		System.out.println(str);			//输出数据
		ds.close();
	}

}

 

tonglin0325

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