hadoop11----socket

package cn.itcast.bigdata.socket;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;

public class ServiceClient {

    public static void main(String[] args) throws Exception {

        /*ServiceIterface service = ProxyUtils.getProxy(ServiceIterface.class,"methodA",hostname,port);
        Result = service.methodA(parameters);*/

        // 向服务器发出请求建立连接
        Socket socket = new Socket("localhost", 8899);
        // 从socket中获取输入输出流
        InputStream inputStream = socket.getInputStream();
        OutputStream outputStream = socket.getOutputStream();

        PrintWriter pw = new PrintWriter(outputStream);
        pw.println("hello");
        pw.flush();

        BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
        String result = br.readLine();//读服务器的流，阻塞，直到谁把流关了，就是把socket关了
        System.out.println(result);

        inputStream.close();
        outputStream.close();
        socket.close();
    }
}

package cn.itcast.bigdata.socket;

import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class ServiceServer {

    public static void main(String[] args) throws Exception {
        // 创建一个serversocket，绑定到本机的8899端口上
        ServerSocket server = new ServerSocket();
        server.bind(new InetSocketAddress("localhost", 8899));
        // 接受客户端的连接请求;accept是一个阻塞方法，会一直等待，到有客户端请求连接才返回
        while (true){
            Socket socket = server.accept();
            new Thread(new ServiceServerTask(socket)).start();
        }
    }
}

package cn.itcast.bigdata.socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;

public class ServiceServerTask implements Runnable {
    Socket socket;
    InputStream in = null;
    OutputStream out = null;

    public ServiceServerTask(Socket socket) {
        this.socket = socket;
    }

    // 业务逻辑：跟客户端进行数据交互
    @Override
    public void run() {
        try {

            // 从socket连接中获取到与client之间的网络通信输入输出流
            in = socket.getInputStream();
            out = socket.getOutputStream();
            // BufferedReader是一直读，读到回车符才返回，所以客户端要发送火车福
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
            // 从网络通信输入流中读取客户端发送过来的数据
            // 注意：socketinputstream的读数据的方法都是阻塞的 ，没有消息也会一直读。
            String line = "";
            while ((line = br.readLine()) != null) {//加上while是一直读，不加while就只会读一次
                line = br.readLine();//读客户端的流。直到socket的流关了
            }

            /**
             * 将以下业务调用逻辑写成更加通用的：可以根据客户端发过来的调用类名、调用方法名、调用该参数来灵活调用 《反射》
             */
            GetDataServiceImpl getDataServiceImpl = new GetDataServiceImpl();
            String result = getDataServiceImpl.getData(line);

            // 将调用结果写到sokect的输出流中，以发送给客户端
            PrintWriter pw = new PrintWriter(out);//out是一个长连接，
            pw.println(result);
            pw.flush();//提交
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if(null!=in) {
                    in.close();
                }
                if(null!=out) {
                    out.close();
                }
                if(null!=socket) {
                    socket.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

package cn.itcast.bigdata.socket;

public class GetDataServiceImpl {
    public String getData(String param){
        return "ok-"+param;
    }
}