Lucene-检索文档中多值字段的所有值 [英] Lucene - retrieve all values for a multi-valued field in a document

问题描述

我在Lucene中添加了一个这样的多值字段:

I added a field in Lucene which is multi-valued as such:

String categoriesForItem = getCategories(); // returns "category1, category2, cat3" from a DB call

String [] categoriesForItems = categoriesForItem.split(","; 
for(String cat : categoriesForItems) {
    doc.add(new StringField("categories", cat , Field.Store.YES)); // doc is a Document 
}

后来，当我搜索某个类别中的项目时，一切都会按预期运行，但是当我获得文档并执行以下操作时:

later when I am searching for items in a category everything works as expected, but when I get a Document and do:

String categories= doc.getField("categories").stringValue(); 

我只会得到该文档的最后一个插入值，而不是为该文档添加的所有值.

I only get the last inserted value for that document rather than all the values that were added for that document.

如何获取为该文档添加的所有值?

How can I get all the values which were added for that document?

推荐答案

要添加到文档中的不是多值单个字段，而是具有相同名称的多个字段.最后，您只检索一个字段.

What you are adding to the document is not multi-valued single field, but multiple fields with the same name. At the end you are only retrieving one field.

改为使用Document中的public final List<IndexableField> getFields().

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