需求

重写ActionSupport国际化getText以适应接口传递语种参数返回对应语种内容信息

分析

要想实现根据前端语种返回，即需传递语种参数（例如：en_US,zh_CN）给到TextProviderFactory以便于struts找到相应后缀名的properties文件（例如:common_zh_CN.properties,common_en_US.properties）
但TextProviderFactory接口的createInstance方法只传递Class。因此新建MyTextProviderFactory接口以及其实现类MyStrutsTextProviderFactory设定新的locale信息的方式

实现

继承ActionSupport的子类重写getText以及getTextProvider方法

public class BaseController extends ActionSupport {
    ·····
    public String getText(String aTextName) {
        return this.getTextProvider().getText(aTextName);
    }
    protected TextProvider getTextProvider() {
        if (this.textProvider == null) {
            Container container = this.getContainer();
            MyTextProviderFactory tpf = (MyTextProviderFactory)container.getInstance(MyTextProviderFactory.class);
            this.textProvider = tpf.createInstance(this.getClass(),user.getLanguage());//传递前端语种参数
        }
        return this.textProvider;
    }
    ······
}

重写TextProviderFactory接口

package com.opensymphony.xwork2;

public interface MyTextProviderFactory {

    TextProvider createInstance(Class clazz, String language);

    TextProvider createInstance(ResourceBundle bundle, String language);

}

重写StrutsTextProviderFactory实现类

package com.opensymphony.xwork2;

public class MyStrutsTextProviderFactory implements MyTextProviderFactory {

    protected LocaleProviderFactory localeProviderFactory;
    protected LocalizedTextProvider localizedTextProvider;
    protected TextProvider defaultTextProvider;

    @Inject
    public void setLocaleProviderFactory(LocaleProviderFactory localeProviderFactory) {
        this.localeProviderFactory = localeProviderFactory;
    }

    @Inject
    public void setLocalizedTextProvider(LocalizedTextProvider localizedTextProvider) {
        this.localizedTextProvider = localizedTextProvider;
    }

    @Inject(required = false)
    public void setDefaultTextProvider(TextProvider defaultTextProvider) {
        this.defaultTextProvider = defaultTextProvider;
    }

    @Override
    public TextProvider createInstance(Class clazz, String language) {
        TextProvider instance = getTextProvider(clazz);
        if (instance instanceof ResourceBundleTextProvider) {
            ((ResourceBundleTextProvider) instance).setClazz(clazz);
            ((ResourceBundleTextProvider) instance).setLocaleProvider(new MyLocaleProvider(language));//设置Locale语种
        }
        return instance;
    }

    @Override
    public TextProvider createInstance(ResourceBundle bundle, String language) {
        TextProvider instance = getTextProvider(bundle);
        if (instance instanceof ResourceBundleTextProvider) {
            ((ResourceBundleTextProvider) instance).setBundle(bundle);
            ((ResourceBundleTextProvider) instance).setLocaleProvider(new MyLocaleProvider(language));//设置Locale语种
        }
        return instance;
    }

    protected TextProvider getTextProvider(Class clazz) {
        if (defaultTextProvider != null) {
            return defaultTextProvider;
        }

        return new TextProviderSupport(clazz, localeProviderFactory.createLocaleProvider(), localizedTextProvider);
    }

    protected TextProvider getTextProvider(ResourceBundle bundle) {
        if (defaultTextProvider != null) {
            return defaultTextProvider;
        }

        return new TextProviderSupport(bundle, localeProviderFactory.createLocaleProvider(), localizedTextProvider);
    }
}

替换获取locale信息的方式

package com.opensymphony.xwork2;

public class MyLocaleProvider implements LocaleProvider {

    private final static Logger LOG = LogManager.getLogger(DefaultLocaleProvider.class);

    private String language;
    public MyLocaleProvider (String language){
        this.language = language;
    }
    @Override
    public Locale getLocale() {
        if (language != null) {
            String[] locales = language.split("_");
            return ctx.getLocale(locales[0],locales[1]);
        } else {
            LOG.debug("Action context not initialized");
            return new Locale("zh","CN");
        }
    }

    @Override
    public boolean isValidLocaleString(String localeStr) {
        Locale locale = null;
        try {
            locale = LocaleUtils.toLocale(StringUtils.trimToNull(localeStr));
        } catch (IllegalArgumentException e) {
            LOG.warn(new ParameterizedMessage("Cannot convert [{}] to proper locale", localeStr), e);
        }
        return isValidLocale(locale);
    }

    @Override
    public boolean isValidLocale(Locale locale) {
        return LocaleUtils.isAvailableLocale(locale);
    }
}