java - 为什么我在使用 lucene 时查询解析器总是出现错误

Question

大家好，我目前正在解析所有 html 正文 用于查找包含单词的列表的文档频率 以及为什么我不断收到此错误

org.apache.lucene.queryParser.ParseException: Cannot parse '': Encountered "<EOF>" at line 1, column 0.

期待以下之一: ... “+”... “——”…… “(”... “”... ... ... ... ... “[”... “{”... ... ... “”...

at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:211)
at CalculateWeightTable.search(CalculateWeightTable.java:221)
at CalculateWeightTable.calculate(CalculateWeightTable.java:134)
at FocusedCrawlingMain.Search(FocusedCrawlingMain.java:64)
at View.actionPerformed(View.java:219)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

这是我用于查找文档频率的代码

它说错误发生在 lucene 尝试解析 queryString 时

位于我的代码的这一部分

Query query = parser.parse(queryString);

我不知道为什么它在解析查询字符串时总是给我错误

private static int search(Searcher searcher, String queryString)
        throws ParseException, IOException {

    // Build a Query object
    StandardAnalyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
    QueryParser parser = new QueryParser(Version.LUCENE_CURRENT, "content",
            analyzer);
    Query query = parser.parse(queryString);

    // Search for the query
    TopScoreDocCollector collector = TopScoreDocCollector.create(10, true);
    searcher.search(query, collector);

    ScoreDoc[] hit = collector.topDocs().scoreDocs;

    int hitsCount = hit.length;

    if (hitsCount == 0) {
        //System.out.println("No matches were found for \"" + queryString+ "\"");
    } else {
        //System.out.println("hit count : " + collector.getTotalHits());

    }

    return collector.getTotalHits();
}

Answer 1

看起来 queryString 对象是空的。您可以从调用该方法的位置检查该方法的输入吗？