Java --socket编程

首先让我们看看最简单的socket client与server实例：

Client

public class MyClient {
    public static void main(String[] args) {
        ObjectOutputStream oos = null;
        ByteArrayOutputStream bos = null;
        Socket client = null;
        try {
            People p = new People("2","yangyu","4","5","6");
            oos = new ObjectOutputStream(bos = new ByteArrayOutputStream()); //初始化object输出流
            oos.writeObject(p);  //将People对象写入输出流
            byte[] bytes = bos.toByteArray();  //获取People对象的byte数组（也就是序列化People）

            client = new Socket("127.0.0.1",20007);   //连接127.0.0.1的20007端口
            client.setSoTimeout(10000);   //设置超时时间

            client.getOutputStream().write(bytes);   //向server发送byte[]数组
            byte[] bytes1 = IOUtils.readFully(client.getInputStream(),18,false);  //获取server返回数据

            System.out.println(new String(bytes1));
            System.out.println(bytes1.length);

        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                oos.close();
                bos.close();
                System.out.println(client.isClosed());
                client.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

Server

public class MyServer {
    public static void main(String[] args) {
        ServerSocket server = null;
        Socket client = null;
        ObjectInputStream ois = null;
        ByteArrayInputStream bis = null;

        try {
            server = new ServerSocket(20007);  //启动Socket server，监听20007端口
            client = server.accept(); //阻塞并等待接收客户端发送数据并生成client

            byte[] bytes = IOUtils.readFully(client.getInputStream(),-1,false);//获取客户端发送过来的数据
            bis = new ByteArrayInputStream(bytes);
            ois = new ObjectInputStream(bis);
            People people = (People) ois.readObject();//反序列化
            System.out.println("people name:"+people.getName());

            String res = "消息已经收到";
            client.getOutputStream().write(res.getBytes());//向客户端发送数据

        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                bis.close();
                ois.close();
                client.close();
                server.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}

以上一个Client和一个Server，最简单的例子，但是体现socket编程。

如果需要Server服务端一直监听端口，那么只需要循环就可以（server.accept()会阻塞等待请求），至于需要高并发的响应，那么Server对数据业务的处理交由线程池来做吧。