Java 多 ResourceBundle

Question

我想从各种包中加载多个属性文件作为 ResourceBundle。我可以用Java实现吗

Answer 1

扩展 java.util.PropertyResourceBundle 并调用 setParent。

Answer 2

这是我的实现：

import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;

public class CombinedResourceBundle extends ResourceBundle
{
    private Map<String, String> combinedResources = new HashMap<>();
    private List<String> bundleNames;
    private Locale locale;
    private Control control;

    public CombinedResourceBundle(List<String> bundleNames, Locale locale, Control control)
    {
        this.bundleNames = bundleNames;
        this.locale = locale;
        this.control = control;
    }

    public void load()
    {
        bundleNames.forEach(bundleName ->
        {
            ResourceBundle bundle = ResourceBundle.getBundle(bundleName, locale, control);
            Enumeration<String> keysEnumeration = bundle.getKeys();
            ArrayList<String> keysList = Collections.list(keysEnumeration);
            keysList.forEach(key -> combinedResources.put(key, bundle.getString(key)));
        });
    }

    @Override
    public Object handleGetObject(String key)
    {
        return combinedResources.get(key);
    }

    @Override
    public Enumeration<String> getKeys()
    {
        return Collections.enumeration(combinedResources.keySet());
    }
}

Answer 3

ResourceBundle.Control() 控制 ResourceBundle 的文件列表。你可以覆盖
getCandidateLocales 和 toBundleName。 toBundleName 将语言环境转换为“文件名”以及您可以在 getCandidateLocales 中控制的语言环境列表。
例如，

 final String[] variants = new String[]{"your names"};
 ResourceBundle.getBundle(baseName, locale,
            new ResourceBundle.Control() {
                public List<Locale> getCandidateLocales(String baseName, Locale locale) {

                        List<Locale> out = new ArrayList<Locale>();
                        String language = locale.getLanguage();
                        String country = locale.getCountry();

                        for (String variant : variants) {
                            out.add(new Locale(language, country, variant));
                        }
                        out.addAll(super.getCandidateLocales(baseName, locale));
                        return out;
                }

                public String toBundleName(String baseName, Locale locale) {
                        Locale l = new Locale(locale.getLanguage(), locale.getCountry());
                        return locale.getVariant() + "." + super.toBundleName(baseName, l);
                }
            });

它仅适用于 Java 1.6

Answer 4

看看这堂课。它非常适合我！类的 Javadoc 解释了如何使用它。

MultiplePropertiesResourceBundle
（+附属 ResourceBundleEnumeration）

在这里您可能会发现有用的单元测试 又名代码文档。