Java之Socket服务端、客户端

收发数据使用byte类型

getBytes();将mesg转换成byte类型

服务端和客户端收发数据都必须使用对应的输入输出流

一、服务端

1.1 单一连接

package com.demo;

import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Test {
	public static void main(String[] args) {
		int len = 0;
		byte[] data = new byte[120];
		
		ServerSocket socket;
		try {
			socket = new ServerSocket(7777);
			System.out.println("socket服务端创建成功，等待连接");
			
			Socket con = socket.accept();
		    System.out.println("客户端接入");
			
		    InputStream fd = con.getInputStream();
		    len = fd.read(data);
			System.out.println("收到数据："+new String(data, 0, len));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}	
	}
}

1.2 多个连接

package com.demo;

import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Test {
	public static void main(String[] args) {
		
		try {
			ServerSocket socket = new ServerSocket(7778);
			System.out.println("socket服务端创建成功，等待连接");
			while(true) {
				final Socket con = socket.accept();
				System.out.println("客户端接入");
				
				Thread t = new Thread(new Runnable() {
					public void run() {
						InputStream fd = null;
						try {
							fd = con.getInputStream();
							byte[] data = new byte[120];
							int len = 0;
							while(true){
								len = fd.read(data);
								System.out.println("收到数据："+new String(data, 0, len));
							}
						} catch (IOException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}	
					}
				});
				t.start();
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}	
	}
}

二、客户端

package com.demo;

import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

public class Test {
	public static void main(String[] args) {	
		try {
			Socket client = new Socket("192.168.43.135", 8080);
			OutputStream out = client.getOutputStream();
			
			Scanner sc = new Scanner(System.in);
			String data = sc.next();
			out.write(data.getBytes());
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}	
	}
}