java - 在 EXT 中添加自定义方法时出现问题

Question

我在 EXT 中添加自定义方法时遇到了这个问题。这是我的代码，

public class MyBlogsEntryServiceImpl extends BlogsEntryServiceImpl{
	
	
	protected static final String DISPLAY_STYLE_VIEWS = "views";
	protected static final String DISPLAY_STYLE_AVATAR = "avatar";

    public List<BlogsEntry> getCompanyEntriesByViews(
            long companyId, Date displayDate, int status, int max)
        throws PortalException, SystemException {
        
        long blogsEntryClassNameId = ClassNameLocalServiceUtil.getClassNameId(BlogsEntry.class);
        
        DynamicQuery blogsEntriesQuery = DynamicQueryFactoryUtil.forClass(BlogsEntry.class, "BlogsEntry")
                .setProjection(ProjectionFactoryUtil.property("BlogsEntry.entryId"))
                .add(PropertyFactoryUtil.forName("BlogsEntry.companyId").eq(companyId));
        
        DynamicQuery mostViewedAssetsQuery = DynamicQueryFactoryUtil.forClass(AssetEntry.class, "AssetEntry")
                .add(PropertyFactoryUtil.forName("AssetEntry.classPK").in(blogsEntriesQuery))
                .add(PropertyFactoryUtil.forName("AssetEntry.classNameId").eq(blogsEntryClassNameId))
                .addOrder(OrderFactoryUtil.desc("AssetEntry.viewCount"));
        
        if (max > 0) {
            mostViewedAssetsQuery.setLimit(0, max);
        }
        
        List<AssetEntry> assetEntries = AssetEntryLocalServiceUtil.dynamicQuery(mostViewedAssetsQuery);
        
        List<BlogsEntry> blogsEntries = new ArrayList<BlogsEntry>(assetEntries.size());
        
        for (AssetEntry asset : assetEntries) {
            try {
                BlogsEntry entry = blogsEntryLocalService.getBlogsEntry(asset.getClassPK());
                if (BlogsEntryPermission.contains(getPermissionChecker(), entry, ActionKeys.VIEW)) {
                    blogsEntries.add(entry);
                }
            } catch (Exception e) {
                _log.warn("Cannot find BlogsEntry with id " + asset.getClassPK());
            }
            
        }
        
        return blogsEntries;
    }
}

在上面的代码中，我遇到了 getCompanyEntriesByViews() 方法的异常，这是错误日志

05:22:29,156 INFO  [localhost-startStop-1][DialectDetector:71] Determine dialect for MySQL 5
05:22:29,281 INFO  [localhost-startStop-1][DialectDetector:136] Found dialect org.hibernate.dialect.MySQLDialect
Starting Liferay Portal Community Edition 6.2 CE GA2 (Newton / Build 6201 / March 20, 2014)
05:22:52,093 INFO  [localhost-startStop-1][BaseDB:484] Database does not support case sensitive queries
05:22:52,546 INFO  [localhost-startStop-1][ServerDetector:119] Server supports hot deploy
05:22:52,546 INFO  [localhost-startStop-1][PluginPackageUtil:1013] Reading plugin package for the root context
05:25:23,250 INFO  [localhost-startStop-1][AutoDeployDir:139] Auto deploy scanner started for E:\liferay62-migration\liferay-portal-6.2-ce-ga2\deploy
05:25:23,828 ERROR [localhost-startStop-1][JSONWebServiceRegistrator:96] java.lang.IllegalArgumentException: java.lang.NoSuchMethodException: com.sun.proxy.$Proxy153.getCompanyEntriesByViews(long, java.util.Date, int, int)
java.lang.IllegalArgumentException: java.lang.NoSuchMethodException: com.sun.proxy.$Proxy153.getCompanyEntriesByViews(long, java.util.Date, int, int)
	at com.liferay.portal.jsonwebservice.JSONWebServiceActionConfig.<init>(JSONWebServiceActionConfig.java:79)
	at com.liferay.portal.jsonwebservice.JSONWebServiceActionsManagerImpl.registerJSONWebServiceAction(JSONWebServiceActionsManagerImpl.java:269)
	at com.liferay.portal.kernel.jsonwebservice.JSONWebServiceActionsManagerUtil.registerJSONWebServiceAction(JSONWebServiceActionsManagerUtil.java:92)
	at com.liferay.portal.jsonwebservice.JSONWebServiceRegistrator.registerJSONWebServiceAction(JSONWebServiceRegistrator.java:261)
	at com.liferay.portal.jsonwebservice.JSONWebServiceRegistrator.onJSONWebServiceBean(JSONWebServiceRegistrator.java:195)
	at com.liferay.portal.jsonwebservice.JSONWebServiceRegistrator.processBean(JSONWebServiceRegistrator.java:93)
	at com.liferay.portal.jsonwebservice.JSONWebServiceRegistrator.processAllBeans(JSONWebServiceRegistrator.java:68)
	at com.liferay.portal.jsonwebservice.JSONWebServiceActionsManagerImpl.registerServletContext(JSONWebServiceActionsManagerImpl.java:324)
	at com.liferay.portal.kernel.jsonwebservice.JSONWebServiceActionsManagerUtil.registerServletContext(JSONWebServiceActionsManagerUtil.java:102)
	at com.liferay.portal.events.GlobalStartupAction.run(GlobalStartupAction.java:317)
	at com.liferay.portal.events.EventsProcessorImpl.processEvent(EventsProcessorImpl.java:108)
	at com.liferay.portal.events.EventsProcessorImpl.process(EventsProcessorImpl.java:59)
	at com.liferay.portal.events.EventsProcessorUtil.process(EventsProcessorUtil.java:32)
	at com.liferay.portal.servlet.MainServlet.processGlobalStartupEvents(MainServlet.java:1038)
	at com.liferay.portal.servlet.MainServlet.init(MainServlet.java:314)
	at javax.servlet.GenericServlet.init(GenericServlet.java:160)
	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5176)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5460)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
	at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:656)
	at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1635)
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoSuchMethodException: com.sun.proxy.$Proxy153.getCompanyEntriesByViews(long, java.util.Date, int, int)
	at java.lang.Class.getMethod(Unknown Source)
	at com.liferay.portal.jsonwebservice.JSONWebServiceActionConfig.<init>(JSONWebServiceActionConfig.java:73)
	... 31 more

我有一些疑问。1. 我们可以在 EXT 中添加我们的自定义方法吗？2.如果是，那么上述问题的解决办法是什么。

请给我建议。

Answer 1

1. 我们可以在 EXT 中添加自定义方法吗？

如果这意味着将方法添加到现有接口(interface):否。您无法更改接口(interface) - API 必须保持稳定 - 考虑需要针对您的版本实现的插件的影响Liferay 界面与我的版本的 Liferay 界面。

如果是，那么上述问题的解决方案是什么。

尽管上面是“否”，我还是会回答这个问题，因为有一个非常简单甚至易于维护的解决方案:

你只需用它自己的服务实现一个钩子(Hook)，例如我的博客扩展。这可能只有一种方法，例如getCompanyEntriesByViews。这个方法的实现只是委托(delegate)给Liferay的BlogService。现在您有了一个可以使用、维护的钩子(Hook)，并且不会破坏众所周知的 API。它与各种应用程序兼容，这就是您想要的。