public static void main(String[] args) {
    ServerSocket serverSocket = null;
    Socket socket = null;
    InputStream inputStream = null;
    ByteArrayOutputStream outputStream = null;

    try {
        //创建一个连接
        serverSocket = new ServerSocket(9999);

        while (true){
            //等待连接
            socket = serverSocket.accept();
            //读取信息
            inputStream = socket.getInputStream();

            outputStream = new ByteArrayOutputStream();
            byte[] bytes = new byte[1024];
            int len;

            if((len=inputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
            }
            System.out.println(outputStream.toString());
        }


    } catch (IOException e) {
        e.printStackTrace();
    }finally {



        if(outputStream!=null){
            try {
                outputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        if(inputStream!=null){
            try {
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        if(socket!=null){
            try {
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        if(serverSocket!=null){
            try {
                serverSocket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }


    }

public static void send(String msg){

        Socket socket = null;
        OutputStream o = null;
        //获取到服务器ip
        try {
            String name = "他:";
            InetAddress ip = InetAddress.getByName("127.0.0.1");
            int port = 9999;
            socket = new Socket(ip,port);
            o = socket.getOutputStream();
            o.write((name+"\n"+msg).getBytes());

        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            if(o!=null){
                try {
                    o.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if(socket!=null){
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }