Matlab-java-Connect

本例子是有高成英老师指导的软件工程高级实训项目《基于深度学习的多特征融合定位系统开发》中个人负责的模板中的一部分。
运行环境：Matlab R2014a & Eclipse

一、Matlab端内嵌java代码，通过java调用socket实现通信，下面是简单的Matlab中TCP/IP socket通信例子。

Matlab作为服务端代码

    % CLIENT connect to a server and read a message
    % Usage - message = client(host, port, number_of_retries)

function message = client(host, port, number_of_retries)

import java.net.Socket
import java.io.*
if (nargin < 3)
    number_of_retries = 20; % set to -1 for infinite
end
retry        = 0;
input_socket = [];
message      = [];
while true
    retry = retry + 1;
    if ((number_of_retries > 0) && (retry > number_of_retries))
        fprintf(1, 'Too many retries\n');
        break;
    end
    try
        fprintf(1, 'Retry %d connecting to %s:%d\n', ...
                retry, host, port);
        % throws if unable to connect
        input_socket = Socket(host, port);
        % get a buffered data input stream from the socket
        input_stream   = input_socket.getInputStream;
        d_input_stream = DataInputStream(input_stream);
        fprintf(1, 'Connected to server\n');
        % read data from the socket - wait a short time first
        pause(0.5);
        bytes_available = input_stream.available;
        fprintf(1, 'Reading %d bytes\n', bytes_available);
        message = zeros(1, bytes_available, 'uint8');
        for i = 1:bytes_available
            message(i) = d_input_stream.readByte;
        end
        message = char(message);
        % cleanup
        input_socket.close;
        break;
    catch
        if ~isempty(input_socket)
            input_socket.close;
        end
        % pause before retrying
        pause(1);
    end
end

end

Matlab客户端代码

    %ERVER Write a message over the specified port
    % Usage - server(message, output_port, number_of_retries)

function server(message, output_port, number_of_retries)

import java.net.ServerSocket
import java.io.*
if (nargin < 3)
    number_of_retries = 20; % set to -1 for infinite
end
retry             = 0;
server_socket  = [];
output_socket  = [];
while true
    retry = retry + 1;
    try
if ((number_of_retries > 0) && (retry > number_of_retries))
            fprintf(1, 'Too many retries\n');
            break;
        end
        fprintf(1, ['Try %d waiting for client to connect to this ' ...
                    'host on port : %d\n'], retry, output_port);
        % wait for 1 second for client to connect server socket
        server_socket = ServerSocket(output_port);
        server_socket.setSoTimeout(1000);
        output_socket = server_socket.accept;
        fprintf(1, 'Client connected\n');
        output_stream   = output_socket.getOutputStream;
        d_output_stream = DataOutputStream(output_stream);
        % output the data over the DataOutputStream
        % Convert to stream of bytes
        fprintf(1, 'Writing %d bytes\n', length(message))
        d_output_stream.writeBytes(char(message));
        d_output_stream.flush;
        % clean up
        server_socket.close;
        output_socket.close;
        break;
    catch
        if ~isempty(server_socket)
            server_socket.close
        end
        if ~isempty(output_socket)
            output_socket.close
        end
        % pause before retrying
        pause(1);
    end
end

end

二、github中代码实现java客户端与matlab服务器之间的简单socket通信，并通过java传送的图片地址在matlab服务端显示出来。

步骤：

1、Matlab服务端启动，监听。

2、java客户端启动，连接matlab服务器，建立一个socket通信并发送第一张图片。

3、Matlab服务端接收java客户端发送的图片或图片地址，使用窗口显示出来，并返回传送的图片的数量的信息。

4、java客户端接收到来自Matalab服务器反馈回来的信息关闭socket通信，建立下一个socket通信继续发送第二张图片。

5、重复3-4步骤

6、完成socket通信