How to encapsulate utility classes in SpringBoot.

The steps for encapsulating Spring Boot utility class are as follows:

1. Create a Java class named SpringBootUtils (or any other name as needed) and declare it as a utility class using the public final class keyword.
2. Include a private constructor to prevent the class from being instantiated.
3. Add static methods in this class that can perform common Spring Boot operations, such as retrieving environment variables and getting application configuration properties.
4. Annotations can be added to explain the purpose, parameters, and return values of each method as needed.
5. To better organize the code, one can group methods within a class based on their functions or relevance, and organize them using static inner classes or other methods.

Below is an example code for the SpringBootUtils utility class:

public final class SpringBootUtils {

    // 私有构造函数，防止实例化
    private SpringBootUtils() {
        throw new UnsupportedOperationException();
    }

    /**
     * 获取应用程序的环境变量
     */
    public static Map<String, String> getEnvironmentVariables() {
        Map<String, String> environmentVariables = new HashMap<>();
        // 获取应用程序的环境变量的代码逻辑
        return environmentVariables;
    }

    /**
     * 获取应用程序的配置属性
     */
    public static Properties getConfigurationProperties() {
        Properties configurationProperties = new Properties();
        // 获取应用程序的配置属性的代码逻辑
        return configurationProperties;
    }

    /**
     * 数据库操作工具类
     */
    public static final class DatabaseUtils {
        // 数据库操作相关的方法
    }

    /**
     * 文件操作工具类
     */
    public static final class FileUtils {
        // 文件操作相关的方法
    }
}

By encapsulating Spring Boot utility classes, code reusability and maintainability can be improved, making it easier for developers to use Spring Boot functionalities in their projects.