java夯实基础-网络编程

本文总结TCP、UDP和URL三种网络编程方法

一、TCP

package ;

import ;
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public class TestTCPClient {
	private static Socket socket;
	private static OutputStream outputStream;
	private static InputStream inputStream;

	public static void main(String[] args) {
		try {
			("我是客户端...");
			socket = new Socket("127.0.0.1",8866);
			outputStream = ();
			("我是客户端发送的数据".getBytes());
			();//冲刷
			
			inputStream = ();
			byte[] b=new byte[1024];
			(b);
			(new String(b));
		} catch (UnknownHostException e) {
			();
		} catch (IOException e) {
			();
		} finally{
			try {
				();
				();
			} catch (IOException e) {
				();
			}
		}
	}
}

package ;

import ;
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public class TestTCPServer {
	private static ServerSocket serverSocket;
	private static InputStream inputStream;
	private static Socket accept;
	private static OutputStream outputStream;

	public static void main(String[] args) {
		try {
			("我是服务器...");
			serverSocket = new ServerSocket(8866);
			accept = ();//等待 接收请求
			inputStream = ();
			byte[] b=new byte[1024];
			(b);
			(new String(b));
			
			outputStream = ();
			("我是服务器端发送的数据".getBytes());
			();
		} catch (IOException e) {
			();
		} finally{
			try {
				();
				();
			} catch (IOException e) {
				();
			}
		}
	}
}

二、UDP

package ;

import ;
import ;
import ;
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import ;
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public class TestUDPClient {
	private static DatagramSocket datagramSocket;
	private static DatagramPacket sdp;
	private static DatagramPacket dp;

	public static void main(String[] args) {
		try {
			datagramSocket = new DatagramSocket();
			byte[] a="我是客户端发送的数据".getBytes();
			sdp = new DatagramPacket(a, ,("127.0.0.1"),9778);
			(sdp);
			
			byte[] b=new byte[1024];
			dp = new DatagramPacket(b, 1024);
			(dp);//接收数据
			(new String((),(),()));
		} catch (SocketException e) {
			();
		} catch (UnknownHostException e) {
			();
		} catch (IOException e) {
			();
		}
	}
}

package ;

import ;
import ;
import ;
import ;
import ;

public class TestUDPServer {
	private static DatagramSocket datagramSocket;
	private static DatagramPacket dp;
	private static DatagramPacket sdp;

	public static void main(String[] args) {
		try {
			datagramSocket = new DatagramSocket(9778);
			byte[] b=new byte[1024];
			dp = new DatagramPacket(b, 1024);//用于接收
			(dp);//接收数据
			InetAddress caddres=();
			int port=();
			("接收到的客户端信息："+caddres+port+new String((),(),()));
			
			byte[] a="服务器返回的数据".getBytes();
			sdp = new DatagramPacket(a, ,caddres,port);
			(sdp);
		} catch (SocketException e) {
			();
		} catch (IOException e) {
			();
		} finally{
			();
		}
	}
}

三、URL

package ;

import ;
import ;
import ;
import ;
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public class TestURL {
	private static URL url;
	private static URLConnection urlConnection;
	private static InputStream inputStream;

	public static void main(String[] args) {
		try {
			url = new URL("/");
			urlConnection = ();
			(());//获取主机名
			(());//获取端口
			(());
			
			byte[] b=new byte[1024];
			inputStream = ();
			(b);
			(new String(b));
		} catch (MalformedURLException e) {
			();
		} catch (IOException e) {
			();
		} finally{
			try {
				();
			} catch (IOException e) {
				();
			}
		}
	}
}