我正在尝试为一个项目编写一个原型,该项目涉及让 java 使用 carrot2 作为多个来源的元搜索引擎,例如 bing 和 google 等。
我有一个依赖项的 Maven 项目:
<dependency>
<groupId>org.carrot2</groupId>
<artifactId>carrot2-core</artifactId>
<version>3.9.3</version>
</dependency>
我正在尝试运行以下内容:
/* A controller to manage the processing pipeline. */
Controller controller = ControllerFactory.createSimple();
/* Input data for clustering, the query and number of results in this case. */
Map<String, Object> attributes = new HashMap<String, Object>();
attributes.put(AttributeNames.QUERY, "sugar");
attributes.put(AttributeNames.RESULTS, 100);
/* Perform processing */
ProcessingResult result = controller.process(attributes,
Bing3DocumentSource.class, LingoClusteringAlgorithm.class);
/* Documents fetched from the document source, clusters created by Carrot2. */
List<Document> documents = result.getDocuments();
List<Cluster> clusters = result.getClusters();
我得到的是:
Exception in thread "main" org.carrot2.core.ComponentInitializationException: Could not instantiate component class: org.carrot2.source.microsoft.Bing3DocumentSource
at org.carrot2.core.SimpleProcessingComponentManager.prepare(SimpleProcessingComponentManager.java:68)
at org.carrot2.core.Controller.process(Controller.java:341)
at org.carrot2.core.Controller.process(Controller.java:246)
at com.jbaysolutions.metasearch.Test.main(Test.java:41)
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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: java.lang.InstantiationException: org.carrot2.source.microsoft.Bing3DocumentSource
at java.lang.Class.newInstance(Class.java:359)
at org.carrot2.core.SimpleProcessingComponentManager.prepare(SimpleProcessingComponentManager.java:55)
... 8 more
我是否正确使用 API?我已经尝试过阅读carrot2 的文档,但它很少涉及API 的使用,而且这些示例也无法正常工作。
真的可以在这里使用一些帮助