現象：

org.apache.lucene.queryParser.ParseException: Encountered "<EOF>" at line 1, column 0. Was expecting one of:<NOT> ..."+" ..."-" ..."(" ...<QUOTED> ...<TERM> ...<PREFIXTERM> ...<WILDTERM> ..."[" ..."{" ...<NUMBER> ...at org.apache.lucene.queryParser.QueryParser.generateParseException(QueryParser.java:1226) at org.apache.lucene.queryParser.QueryParser.jj_consume_token(QueryParser.java:1109) at org.apache.lucene.queryParser.QueryParser.Clause(QueryParser.java:759) at org.apache.lucene.queryParser.QueryParser.Query(QueryParser.java:684) at ch2.lucenedemo.process.Test.RunVsIndex(Test.java:142) at ch2.lucenedemo.process.Test.main(Test.java:169)

方法一：

?如果出現了下列錯誤，那是因為用錯了函數。把queryParser.Query改稱queryParser.parse就通過了

方法二：

1、提問：

I am working on a classification problem to classify product reviews as positive, negative or neutral as per the training data using Lucene API.

I am using an ArrayList of Review objects - "reviewList" that stores the attributes for each review while crawling the web pages.

The review attributes which include "polarity" & "review content" are then indexed using the indexer. Thereafter, based on the indexes objects, I need to classify the remaining review objects. But while doing so, there is a review object for which the Query parser is encountering an EOF character in the "review content", and hence terminating.

The line causing error has been commented accordingly -

IndexReader reader = IndexReader.open(FSDirectory.open(new File("index")));IndexSearcher searcher = new IndexSearcher(reader);Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_31);QueryParser parser = new QueryParser(Version.LUCENE_31, "Review", analyzer);int length = Crawler.reviewList.size();for (int i = 200; i < length; i++) {String true_class;double r_stars = Crawler.reviewList.get(i).getStars();if (r_stars < 2.0) {true_class = "-1";} else if (r_stars > 3.0) {true_class = "1";} else {true_class = "0";}String[] reviewTokens = Crawler.reviewList.get(i).getReview().split(" ");String parsedReview = "";int j;for (j = 0; j < reviewTokens.length; j++) {if (reviewTokens[j] != null) {if (!((reviewTokens[j].contains("-")) || (reviewTokens[j].contains("!")))) {parsedReview += reviewTokens[j] + " ";}} else {break;}}Query query = parser.parse(parsedReview); // CAUSING ERROR!!TopScoreDocCollector results = TopScoreDocCollector.create(5, true);searcher.search(query, results);ScoreDoc[] hits = results.topDocs().scoreDocs;

I've parsed the text manually to remove the characters that are causing the error, apart from checking if the next string is null...but the error persists.

This is the error stack trace -

Exception in thread "main" org.apache.lucene.queryParser.ParseException: Cannot parse 'I made the choice ... be all "thumbs ': Lexical error at line 1, column 938. Encountered: <EOF> after : "\"thumbs " at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:216) at Sentiment_Analysis.Classification.classify(Classification.java:58) at Sentiment_Analysis.Main.main(Main.java:17) Caused by: org.apache.lucene.queryParser.TokenMgrError: Lexical error at line 1, column 938. Encountered: <EOF> after : "\"thumbs " at org.apache.lucene.queryParser.QueryParserTokenManager.getNextToken(QueryParserTokenManager.java:1229) at org.apache.lucene.queryParser.QueryParser.jj_scan_token(QueryParser.java:1709) at org.apache.lucene.queryParser.QueryParser.jj_3R_2(QueryParser.java:1598) at org.apache.lucene.queryParser.QueryParser.jj_3_1(QueryParser.java:1605) at org.apache.lucene.queryParser.QueryParser.jj_2_1(QueryParser.java:1585) at org.apache.lucene.queryParser.QueryParser.Clause(QueryParser.java:1280) at org.apache.lucene.queryParser.QueryParser.Query(QueryParser.java:1266) at org.apache.lucene.queryParser.QueryParser.Clause(QueryParser.java:1313) at org.apache.lucene.queryParser.QueryParser.Query(QueryParser.java:1266) at org.apache.lucene.queryParser.QueryParser.TopLevelQuery(QueryParser.java:1226) at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:206) ... 2 more Java Result: 1

Please help me solve this problem...have been banging my head with this for hours now!

2、問答

You should escape the double quote and other special characters via

Query query = parser.parse(QueryParser.escape(parsedReview));

As the?QueryParser.escape?Javadoc suggested,

Returns a String where those characters that QueryParser expects to be escaped are escaped by a preceding '\'.

小結：使用 QueryParser的靜態方法QueryParser.escape(string s)，進行自動轉義特殊字符后再進行關鍵字的查詢

?

原文出處：

現象及方法一：

不設限, org.apache.lucene.queryParser.ParseException: Encountered "<EOF>" at line 1, column 0.?https://blog.csdn.net/tengdazhang770960436/article/details/17881671

方法二：

https://stackoverflow.com/questions/10259907/lucene-exception-query-parser-encountered-eof-after-some-word

轉載于:https://www.cnblogs.com/ryelqy/p/10104041.html

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