解析查询时出现Lucene错误:无法解析":遇到“< EOF>"在第1行，第0列

问题描述

我想使用Lucene查询解析器解析一些文本，以对文本进行基本的文本预处理.我使用了以下代码行:

I want to parse some text using Lucene query parser to carry out basic text preprocessing on the texts. I used following lines of code:

Analyzer analyzer = new EnglishAnalyzer();
QueryParser parser = new QueryParser("", analyzer);
String text = "...";
String ret = parser.parse(QueryParser.escape(text)).toString();

但是，我收到一个错误消息:

But, I am getting an error:

Exception in thread "main" org.apache.lucene.queryparser.classic.ParseException: Cannot parse '': Encountered "<EOF>" at line 1, column 0.

推荐答案

使用Query.escape()会删除特殊字符.但是它不会删除

Using Query.escape() removes the special characters. However it doesn't remove

是在lucene搜索中使用的关键字.

which are keywords used in lucene search.

有两种处理方法:

1. 在查询字符串中替换AND，NOT或OR.
2. 将查询字符串转换为小写.

转换为小写字母可以解决此问题，因为只有大写的AND，NOT或OR是关键字.它们被视为小写的普通单词.

Converting to lower case resolves the issue as only the capitalized AND, NOT, OR are keywords. They are treated as a regular word in lower case.

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