提取关键词及相应的频率，Field.Store.NO的数据获取

1.提取关键词及相应的频率

java 代码

RAMDirectory ramDir = new RAMDirectory();
        IndexWriter ramWriter = null;
        IndexReader ramReader = null;
        try {
            ramWriter = new IndexWriter(ramDir, analyzer, true);
            StringBuffer strBuffer = new StringBuffer();
            for (Iterator iter = keyWordList.iterator(); iter.hasNext();) {
                String element = (String) iter.next();
                strBuffer.append(element + " ");
            }
            Document doc = new Document();
            doc.add(new Field("keyword", strBuffer.toString() , Field.Store.NO,Field.Index.TOKENIZED));
            ramWriter.addDocument(doc);
            ramWriter.close();
            ramReader = IndexReader.open(ramDir);
            int maxDoc = ramReader.maxDoc();

            TermFreqVector freqVector = ramReader.getTermFreqVector(0, "keyword");


            //提取关键字！
            if(freqVector != null){
                for (int i = 0; i < freqVector.size(); i++) {
                    String keyword = freqVector.getTerms()[i];
                    int frequece = freqVector.getTermFrequencies()[i];

                }
            }

2. 索引中Field.Store.NO的数据一般获取方式：

java 代码

for(int i=0;i<hits.length();i++){
        int docId = hits.id(i);
        TermFreqVector vector = reader.getTermFreqVector(docId, "itemContent");
        for (int j = 0; j < vector.size(); j++) {
            int freq = vector.getTermFrequencies()[j];
            String text = vector.getTerms()[j];
        }
    }

评论

1 楼 chencang 2008-10-22  

doc.add(new Field("keyword", strBuffer.toString() , Field.Store.NO,Field.Index.TOKENIZED));

大哥，你这构建Field的函数没设置Field.TermVector.YES参数啊，后面应该提取不到关键字和词频信息吧？