java - 一个ResourceBundle实例获取字符串资源

Question

我在数据资源组织方面需要一些帮助。我有一些resource.properties 文件(LabelResources.properties、ParagraphResources.properties)。我可以通过以下标准方式从他们那里获取数据:

private static ResourceBundle myBundle = ResourceBundle.getBundle("com.helmes.rentalstore.res.Resource");
myBundle.getString("welcome")

我不喜欢这里，我每次都需要在所有需要从资源中获取字符串的类中进行初始化。是否可以这样做，我可以在没有显式 ResourceBundle 初始化的情况下编写以下内容:

Resources.getBundle("com.helmes.rentalstore.res.Resource").getString("welcome")

更新

我用下面的方法做到了:

public enum ResourceBundleType {
    LABELS(ResourceBundle.getBundle("Labels", Locale.ENGLISH)),
    ERRORS(ResourceBundle.getBundle("Errors", Locale.ENGLISH));

    private final ResourceBundle bundle;

    private ResourceBundleType(ResourceBundle bundle) {
        this.bundle = bundle;
    }

    public ResourceBundle getBundle() {
        return bundle;
    }
}


public class Resource {

    private static Resource instance;
    private ResourceBundle bundle;

    private Resource(ResourceBundle bundle) {
        this.bundle = bundle;
    }

    public static synchronized Resource getInstance(ResourceBundle bundle) {

        if (instance == null) {
            instance = new Resource(bundle);
        } else if (!instance.bundle.getBaseBundleName().equals(bundle.getBaseBundleName())) {
            instance = new Resource(bundle);
        }

        return instance;
    }

    public String getString(String key) {
        if (bundle.containsKey(key))
            return this.bundle.getString(key);

        return null;
    }

    public String getString(String key, Object... params) {
        if (bundle.containsKey(key))
            return MessageFormat.format(this.bundle.getString(key), params);

        return null;
    }
}

调用它:

Resource.getInstance(ResourceBundleType.LABELS.getBundle()).getString("welcome", 1);

它现在正在我的项目中运行。你能评论一下吗？是否按照OOP原理和设计正常实现？

Answer 1

您可以编写一个包装器单例类来执行一次实际的 bundle 初始化，然后在进一步的请求中使用这些 bundle :

public class PropertiesHolder {

    private static PropertiesHolder instance;

    private PropertiesHolder() {
        //initialize bundles here
    }

    public static synchronized PropertiesHolder getInstance() {
        if (instance == null) {
            instance = new PropertiesHolder();
        }

        return instance;
    }

    public String getProperty(String key) {
        //something like return bundle.getstring(key);
    }
}