将图像保存到远程服务器

debugcn 发表于 Dev

巴勃罗

我一直在寻找将文件保存到MySQL数据库的最佳方法，因为我有一个需要保存和检索多个图像的Java程序。我首先想到了用BLOB设置表并使用以下发现的代码：

File image = new File("C:/image.jpg");
PrepareStatement psmnt = connection.prepareStatement
("insert into save_image(image) "+ "values(?)");

FileInputStream fis = new FileInputStream(image);
psmnt.setBinaryStream(3, (InputStream)fis, (int)(image.length()));
/* executeUpdate() method execute specified sql query. Here this query 
insert data and image  */ 
int s = psmnt.executeUpdate();

但是，我读到，不建议将MySQL数据库用于已序列化的图像以提高性能。有人告诉我最好在服务器中保存指向目录的指针。您如何下载文件并将其上传到远程服务器？还是建议您改用MySQL数据库？

哺乳动物

您可以使用套接字将映像传输到服务器。这将是客户端/服务器通信，因此您需要发送者和接收者程序。

客户（发件人）

public static void sendFileToServer() throws Exception {
        Path path = Paths.get("path/to/file");
        byte[] data = Files.readAllBytes(path);

        // port has to be the same on client and server side
        int port = 1337; 

        //create a socket connection to the server
        Socket socket = new Socket("ipAdressOfTheServer", port);
        OutputStream out = socket.getOutputStream();

        // first write the length of the file so the receiver knows how much it has to read
        out.write(ByteBuffer.allocate(4).putInt(data.length).array());
        //write the actual file data
        out.write(data, 0, data.length);
        socket.close();
    }

服务器（接收器）

public static void receiveFile() throws Exception {
        //create a ServerSocket to listen for incoming connections
        ServerSocket server = new ServerSocket(1337);
        Socket senderSocket = server.accept();
        DataInputStream in = new DataInputStream(senderSocket.getInputStream());
        //first read the length of the file
        int lengthOfFile = in.readInt();
        byte[] buffer = new byte[lengthOfFile];

        //then read the actual file bytes
        in.readFully(buffer);

        FileOutputStream fos = new FileOutputStream("pathname");
        fos.write(buffer);
        fos.close();
    }

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