弹簧设置库 [英] spring settings repository

问题描述

我的许多应用程序属性由数据库提供，我想通过存储库注入它们。我想知道春天是否可行。如果有人可以提出解决方案，我会很高兴。我正在考虑的代码看起来像这样：

many of my application-properties are provided by the database i would like to inject them via a repository. I wonder if this is doable with spring. I would be happy if someone could suggest a solution. The code i'm thinking about looks something liek this:

    @Component
    public class ExampleService implements Service {

        private PlatformSetting setting1;

        @Required
        @Qualifier("setting1")
        public void setSetting1(PlatformSetting setting1) {
            this.setting1 = setting1;
        }

        public String getMessage() {
            return "Hello world!" + setting1.getValue();    
        }

    }


    @Repository
    public class PlatformSettingRepository {


        private HashMap<String, PlatformSetting> settings;
        {
            settings = new HashMap<String, PlatformSetting>();
            settings.put("setting1", new PlatformSetting("bla1"));
            settings.put("setting2", new PlatformSetting("bla2"));

        }

        @Bean
        public PlatformSetting findSetting(@Qualifier String qual) {
            return settings.get(qual);
        }
    }

我知道我可以将PlatformSettingRepositoy注入服务中查找它。但是我不想在调用时进行这些查找，而是希望spring容器在启动时进行查找。

i know i could just inject the PlatformSettingRepositoy into the service to look it up. But i don't want to make these lookups at invocation time i want the spring container to do them on startup.

推荐答案

使用Spring表达式语言。

Use Spring expression language.

步骤1：使用@Bean公开您的设置哈希图，用id = appSettings来说

Step 1: Expose your settings hashmap using @Bean, lets say with id ="appSettings"

步骤2：现在您要注入设置1的位置，只需使用批注：

Step 2: Now where you want settings 1 injected, just use the annotation :

@Value("#{ appSettings['setting1'] }")
private PlatformSetting setting1;

注意：这适用于普通值，也适用于您的情况。尽管我还没有尝试过。
如果这不起作用，则可以直接在您的方法中使用表达式解析器，因为您已经在使用java config初始化bean的方式。

Note: This works with plain values, and it should work in your case as well. Though I haven't tried it. If this doesn't work, you could directly use a expression parser in your method since you are already using java config way of initializing beans.

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