实现socket的服务和客户端通信

package com.wenbing.socket;

import java.net.InetSocketAddress;
import java.net.Proxy;
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));

//        接收客户端的连接；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();
//            每个socket请求都给一个线程来处理
            new Thread(new ServiceServerTask(socket)).start();

        }

    }

}

package com.wenbing.socket;

import java.io.*;
import java.net.Socket;

public class ServiceServerTask implements Runnable {

    Socket socket;
    InputStream inputStream = null;
    OutputStream outputStream = 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流
            inputStream = socket.getInputStream();
//            从socket连接中获取到与client之间的网络通信输出流
            outputStream = socket.getOutputStream();

//            BufferedReader读取数据是一个字符一个字符读取，遇到回车即停止
            BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
//            从网络通信输入流中读取客户端发送过来的数据，读取一行，遇到回车即结束
            // 注意:socketinputstream的读数据的方法是阻塞的
            //读取很多行数据，用while循环读
//            String line = "";
//            String param = "";
//            while (( line = br.readLine()) != null) {
//                param = br.readLine();
//                System.out.println(param);
//            }
            String param = br.readLine();

            System.out.println(param);
            GetDataServiceImpl getDataService = new GetDataServiceImpl();
            String result = getDataService.getData(param);

//            将调用结果写到socket的输出流中，以发送给客户端
            PrintWriter printWriter = new PrintWriter(outputStream);
            printWriter.println(result);
            printWriter.flush();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
//                关流，现在是在每个线程里
                inputStream.close();
                outputStream.close();
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }


    }
}

package com.wenbing.socket;

public class GetDataServiceImpl {

    public String getData(String param) {
        return "OK-" + param;
    }

}

package com.wenbing.socket;

import java.io.*;
import java.net.Socket;

public class ServiceClient {

    public static void main(String[] args) throws Exception {
//        向服务器发出请求建立连接
        Socket socket = new Socket("localhost", 8899);
//        从socket中获取输出流
        InputStream inputStream = socket.getInputStream();
        OutputStream outputStream = socket.getOutputStream();

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

        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
        String result = bufferedReader.readLine();
        System.out.println(result);

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

}