OSGi Configuration

有什么用？

admin可以直接在OSGi Configuration中进行配置，而不用在Java代码中进行修改。
OSGi Configuration中修改实则就是在改Java代码。

转载自:osgi configuration aem

Interface

public interface FooterOSGi {

    String[] getServiceText();
    String[] getServiceValue();
}

Class

@Component
@Designate(ocd = FooterOSGiConfig.ServiceConfig.class)//这是必须的
public class FooterOSGiConfig implements FooterOSGi{
    @ObjectClassDefinition(
            name = "Footer Service",
            description = "For Dropdown"
    )
    public @interface ServiceConfig{//这个注解很重要

        @AttributeDefinition(//这里面的内容是让OSGi可以填的，如下图
                name = "text",
                description = "show name",
                type = AttributeType.STRING
        )
        public String[] serviceText() default "A";

        @AttributeDefinition(
                name = "value",
                description = "show value",
                type = AttributeType.STRING
        )
        public String[] serviceValue() default "B";
    }

    private String[] serviceText;
    private String[] serviceValue;

    @Activate
    protected void activate(ServiceConfig serviceConfig){//激活以后就可以取到值了
        serviceText = serviceConfig.serviceText();
        serviceValue = serviceConfig.serviceValue();
    }
    @Override
    public String[] getServiceText() {
        return serviceText;
    }
    @Override
    public String[] getServiceValue() {
        return serviceValue;
    }
}

取值

取值我试了下，我之前写的Servlet娶不到。
但是Sling Model可以取到，
必须得注入接口来取（之前我其实没写接口，直接就写Class，然后发现取不到值，后面又给他加了个接口实现一下就可以了）
@Inject
FooterOSGi fo;
(@Inject换成@OSGiService也可以)

---

全新发现！

Servlet也可以取值！！！！用@Reference就可以了！！！！
然后我就取值把之前的servlet提取json的代码改了一下。就可以直接在OSGi中进行配置了

    @Reference
    FooterOSGi fo;

...
doGet():
            //Get json path through datasource options
/*
            String jsonStr = null;
            Resource datasource = currentResource.getChild("datasource");
            Object options = datasource.getValueMap().get("options");
            Resource jsonResource = resolver.getResource(options.toString()+"/jcr:content");
            jsonStr = getJsonFromFile(jsonResource);//Json to String
*/

            Gson gson = new Gson();
            TypeToken<List<Option>> token = new TypeToken<List<Option>>(){};

/*
            List<Option> optionList = gson.fromJson(jsonStr, token.getType());
*/
            List<Option> optionList = new ArrayList<>();
            String[] serviceText = fo.getServiceText();
            String[] serviceValue = fo.getServiceValue();
            for(int i=0; i<fo.getServiceText().length; i++){
                optionList.add(new Option(serviceText[i], serviceValue[i]));
            }
            List<Resource> optionResourceList = new ArrayList<Resource>();
/*↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑ replace getting json from node ↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑ */