Socket

PS:如果服务器和客户端通信。可以通过WebService，不过这种有点大费劲，太重了。可以通过socket

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 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 
            String param = br.readLine();
            
            
            /**
             * 作业：
             * 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(param);
            
            
            //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);
            pw.println(result);
            pw.flush();
            
            
            
        } catch (IOException e) {
             
            e.printStackTrace();
        }finally{
            try {
                in.close();
                out.close();
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            
        }
        
    }

}

//客户端
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();
        System.out.println(result);
        
        inputStream.close();
        outputStream.close();
        socket.close();
        
        
    }
}

package cn.itcast.bigdata.socket;

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