strust2中是如何初始化container并且使其全局单例

Struts2容器初始化

原创于 2012-10-09 17:16:35 发布 · 90 阅读

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本文详细介绍了Struts2框架中容器(Container)的初始化过程，并解释了如何实现全局单例模式。通过StrutsPrepareAndExecuteFilter类，利用init_PreloadConfiguration方法进行配置加载，确保了容器在应用启动时被正确初始化。

strust2中是如何初始化container并且使其全局单例？

StrutsPrepareAndExecuteFilter

protected PrepareOperations prepare;
protected ExecuteOperations execute;

Dispatcher dispatcher = init.initDispatcher(config);

init()

Container container = init_PreloadConfiguration();

   private Container init_PreloadConfiguration() {
        Configuration config = configurationManager.getConfiguration();
        Container container = config.getContainer();

boolean reloadi18n = Boolean.valueOf(container.getInstance(String.class, StrutsConstants.STRUTS_I18N_RELOAD));
LocalizedTextUtil.setReloadBundles(reloadi18n);

return container;
}

Configuration config = configurationManager.getConfiguration();
Container container = config.getContainer();

public synchronized Configuration getConfiguration() {
        if (configuration == null) {
            setConfiguration(createConfiguration(defaultFrameworkBeanName));
            try {
                configuration.reloadContainer(getContainerProviders());
            } catch (ConfigurationException e) {
                setConfiguration(null);
                throw new ConfigurationException("Unable to load configuration.", e);
            }
        } else {
            conditionalReload(configuration.getContainer());
        }

return configuration;
}

....

prepare = new PrepareOperations(filterConfig.getServletContext(), dispatcher);
execute = new ExecuteOperations(filterConfig.getServletContext(), dispatcher);