基本的Socket通信

package netty;//1.服务端import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.Socket;package netty;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;public class Server {    public static void main(String[] args) throws IOException {        DataInputStream dataInputStream=null;        DataOutputStream dataOutputStream=null;        Socket socket=null;        try {            ServerSocket serverSocket=new ServerSocket(12345);            System.out.println("查询天气服务");            socket=serverSocket.accept();            dataInputStream=new DataInputStream(socket.getInputStream());            dataOutputStream=new DataOutputStream(socket.getOutputStream());            String readUTF = dataInputStream.readUTF();            System.out.println("服务器端接收到信息"+readUTF);            String result="晴天";            dataOutputStream.writeUTF(result);            System.out.println("发送给客户端");        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }finally{            dataInputStream.close();            dataOutputStream.close();            socket.close();        }    }}服务端用socket=serverSocket.accept();进入等待状态，等待客户端发出请求。接收到请求后，返回请求结果//2.客户端public class Client {public static void main(String[] args) throws IOException {Socket socket=new Socket("127.0.0.1", 12345);DataInputStream dataInputStream=null;DataOutputStream dataOutputStream=null;try {dataOutputStream=new DataOutputStream(socket.getOutputStream());String request="今天天气如何";dataOutputStream.writeUTF(request);System.out.println("客户端发出请求"+request);dataInputStream=new DataInputStream(socket.getInputStream());String readUTF = dataInputStream.readUTF();System.out.println("客户端收到信息:"+readUTF);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{socket.close();dataInputStream.close();dataOutputStream.close();}}}客户端用Socket连接到服务器，给服务器发送信息，并收到服务端的响应信息。