The logical process of developing a croppable online photo album application in Java

Logical process of developing a croppable online photo album application in Java

In the digital age, mobile phone cameras have become the main device for more and more people to record their lives and commemorate precious moments. As the number of photos continues to increase, an easy-to-use photo album management tool has become an urgent need. This article will introduce how to develop a croppable online photo album application using Java.

1. Requirements analysis

Before starting development, a needs analysis needs to be performed. Based on user needs, we can determine that this online photo album application needs to have the following functions:

1. Users can upload their own photos to the online photo album
2. Category management of photos, such as by shooting Categories such as time and location
3. Users can share a photo in the album to others
4. The application needs to be able to crop the photo size and dimensions
5. Excellent security performance, guaranteed Users' personal privacy data will not be leaked

2. Technology selection

In order to achieve the above requirements, we need to use the Java programming language for development. In addition, we also need to use the following technologies:

1. SpringMVC: It can quickly build an application framework and help developers write code more efficiently.
2. Hibernate: Can quickly operate the database and simplify coding difficulty.
3. Bootstrap and jQuery: front-end design interface for developing applications.

3. Architectural design

The architectural design of the application includes three levels: presentation layer, business logic layer, and data access layer.

1. Presentation layer: Responsible for interacting with users. The implementation of the presentation layer needs to include two parts. One part is the function for users to upload photos, and the other part is the function of classifying and sharing photos. In the presentation layer, we need to use bootstrap and jQuery for UI development and implementation.
2. Business logic layer: Responsible for business logic processing. The business logic layer can complete user photo cropping, size scaling and other operations.
3. Data access layer: Responsible for operating the data access process of the database and storing data uploaded by users. During the implementation of the data access layer, we need to use Hibernate to operate the database.

4. Write code

1. Introduce the required dependent library files:

First you need to introduce it in the pom.xml file of the project The following dependent libraries:

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>5.4.21.Final</version>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>6.1.5.Final</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-core</artifactId>
        <version>9.0.50</version>
    </dependency>

    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-jasper</artifactId>
        <version>9.0.50</version>
    </dependency>

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.4</version>
    </dependency>

    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.8.0</version>
    </dependency>

    <dependency>
        <groupId>org.imgscalr</groupId>
        <artifactId>imgscalr-lib</artifactId>
        <version>4.2</version>
    </dependency>
</dependencies>

2. To implement user registration and login functions

To implement user registration and login functions, you need to create a corresponding user table in the database and write code to Information entered by the user is stored in the user table.

3. Implementing the photo upload function

Because users may upload multiple photos, it is necessary to implement the multi-file upload function of the album. We can use Apache Commons FileUpload, a third-party tool library, to implement file upload. In the controller, use the MultipartFile interface to accept files uploaded by the user.

4. Implementing photo classification and management functions

After uploading photos are stored in the system, they need to be classified and managed. It is recommended to sort photos by date and location. In the front-end interface, you can use the components provided by BootStrap to display the uploaded photos in the form of cards, and you can classify and manage the photos.

5. Implementing the photo sharing function

In order to facilitate users to share photos in the album, we can add a sharing link to the user, send this link to others, and others can Click this link to access and view the user's photos. Sharing links can be generated using random strings.
In the photo album, you can add a "Share" button for users to generate sharing links. After clicking the "Share" button, the system's internal file operation class is called to generate a globally unique string, which is appended to the share link as a parameter. Users can share this photo with others by sending a link with this parameter.

6. Realize photo cropping and size scaling

In order to meet the specific size needs of users, we can add a photo resizing function. This function needs to be implemented using Java's image processing class library.
On the photo operation page, users can select the part to be cropped and adjust parameters such as cropping position and size. On the server side, the imgscalr-lib library is used for cropping according to the parameters selected by the user.

7. Implement permission-based security control

In the application, it is necessary to implement security control on how users operate the album. For example, only the album creator or owner can upload and modify photo information, and other users cannot change it. In response to this requirement, we can define a specific permission for each operation and make judgments in the business logic.

5. Summary

The above is the basic logical process of developing a croppable online photo album application using Java. In addition, there are many details and functional designs that need to be considered and implemented. During the development process, it is necessary to constantly reflect and optimize, and do a lot of testing work to achieve an efficient, stable, safe and easy-to-use online photo album application.

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