Eclipse插件：如何在打开或关闭文件时执行某些操作

Question

我是Eclipse插件开发中的新手。

我希望做一些操作（如检查其内容的一些字符串，以备份等），只要文件被打开或Eclipse编辑器关闭。（据我所知没有一个Eclipse RCP应用程序）

一些搜索后当文件在Eclipse中的文本编辑器中打开

org.eclipse.ui.file.close：当文件被关闭/删除，我碰到使用命令ID

1. org.eclipse.ui.file.import来到来自日蚀文字编辑器

而且，这是我的尝试：

在MANIFEST.MF /扩展 -

而且，里面清单 - >扩展 - >所有扩展 - > org.eclipse.ui.handlers

FileImportHandler文件 -

package com.example.eclipse.handlers; 

import org.eclipse.core.commands.AbstractHandler; 
import org.eclipse.core.commands.ExecutionEvent; 
import org.eclipse.core.commands.ExecutionException; 



public class FileImportHandler extends AbstractHandler { 

@Override 
public Object execute(final ExecutionEvent event) throws ExecutionException { 
    System.out.println("File import called."); 
    return null; 
} 

@Override 
public boolean isEnabled() { 
    // TODO Auto-generated method stub 
    return true; 
} 

@Override 
public boolean isHandled() { 
    // TODO Auto-generated method stub 
    return true; 
} 


} 

但是，我得到如下：

!ENTRY org.eclipse.ui 4 0 2014-11-14 12:40:33.266 
!MESSAGE The proxied handler for 'com.example.eclipse.handlers.FileImportHandler' could not be loaded 
!STACK 1 
org.eclipse.core.runtime.CoreException: Plug-in Demo-eclipse-plugin was unable to load class com.example.eclipse.handlers.FileImportHandler. 
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.throwException(RegistryStrategyOSGI.java:194) 
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:176) 
    at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905) 
    at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243) 
    at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55) 
    at org.eclipse.ui.internal.handlers.HandlerProxy.loadHandler(HandlerProxy.java:347) 
    at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:283) 
    at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:606) 
    at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56) 
    at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:243) 
    at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:224) 
    at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132) 
    at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:167) 
    at org.eclipse.core.commands.Command.executeWithChecks(Command.java:499) 
    at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508) 
    at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:213) 
    at org.eclipse.ui.internal.handlers.LegacyHandlerService.executeCommand(LegacyHandlerService.java:420) 
    at org.eclipse.ui.internal.actions.CommandAction.runWithEvent(CommandAction.java:157) 
    at org.eclipse.ui.internal.actions.CommandAction.run(CommandAction.java:171) 
    at org.eclipse.ui.actions.ImportResourcesAction.run(ImportResourcesAction.java:97) 
    at org.eclipse.ui.actions.BaseSelectionListenerAction.runWithEvent(BaseSelectionListenerAction.java:168) 
    at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584) 
    at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501) 
    at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411) 
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) 
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057) 
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170) 
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113) 
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997) 
    at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:138) 
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:610) 
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) 
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567) 
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150) 
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124) 
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) 
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) 
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) 
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354) 
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:606) 
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636) 
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591) 
    at org.eclipse.equinox.launcher.Main.run(Main.java:1450) 
    at org.eclipse.equinox.launcher.Main.main(Main.java:1426) 
Caused by: org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle Demo-eclipse-plugin (618). 
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:124) 
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:469) 
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216) 
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395) 
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:464) 
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421) 
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412) 
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358) 
    at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:340) 
    at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:229) 
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1212) 
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174) 
... 52 more 
Caused by: org.osgi.framework.BundleException: Exception in com.example.eclipse.Activator.start() of bundle Demo-eclipse-plugin. 
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:734) 
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683) 
    at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381) 
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:300) 
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:478) 
    at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:263) 
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:109) 
... 64 more 

任何帮助将是明显的。

Answer 1

您的插件激活在start方法产生的异常：

Exception in com.example.eclipse.Activator.start() 

你在做什么呢？

这些命令的处理程序负责显示导入和导出对话框，我不认为你正在尝试做什么。

您可以监听使用IResourceChangeListener