1. Socket简介

socket可分类三类，其SOCK_RAW是最低层协议，

2. Socket类

2.1 socket Constructor

2.2 socket类的常用方法

3 SocketServer类

3.1 SocketServer 构造方法

3.2 SocketServer类的常用方法

4 代码实现

4.1 服务端

public class Server{
	 public static void main(String[] avgs){
        try {
	            ServerSocket server = new ServerSocket(8800);
	            // 阻塞服务 ，检测到有一个请求，创建 Socket;
	            Socket socket = server.accept();
	            InputStream is = socket.getInputStream();
	            BufferedReader br = new BufferedReader(new InputStreamReader(is));
	            String input = null;
	            while( (input= br.readLine())!=null){
	                	System.out.println(input);
	            }
	            OutputStream os = socket.getOutputStream();
	            PrintWriter pw = new PrintWriter(os);
	            pw.write("copy!");
	            pw.flush();
	
	            br.close();
	            is.close();
	            pw.close();
	            os.close();
	            socket.close();
	            server.close();
	
	        } catch (IOException e) {
	            e.printStackTrace();
	        }
    }
}

4.2 客户端

public class Client {
	    public static void main(String[] args) {
		        try (Socket socket = new Socket("localhost", 8800)) {
			            OutputStream os = socket.getOutputStream();
			            PrintWriter pw = new PrintWriter(os);
			            String output = "this msg is from client!";
			            pw.write(output);
			            pw.flush();
			            socket.shutdownOutput(); // 关闭输出流，无此操作，接收下面数据；
			            InputStream is = socket.getInputStream();
			            BufferedReader br = new BufferedReader(new InputStreamReader(is));
			            String input = null;
			            while( (input= br.readLine())!=null){
			               	 System.out.println(input);
			            }
			            pw.close();
			            os.close();
			            br.close();
			            is.close();
			            socket.close();
			     
			    } catch (UnknownHostException e) {
		           	 e.printStackTrace();
		        } catch (IOException e) {
		            	e.printStackTrace();
		        }
	    }
}