Lucene常用查询器——代码

package com.team.lucene;import java.io.File;import java.io.IOException;import lombok.extern.slf4j.Slf4j;import org.apache.lucene.analysis.Analyzer;import org.apache.lucene.analysis.standard.StandardAnalyzer;import org.apache.lucene.document.Document;import org.apache.lucene.index.DirectoryReader;import org.apache.lucene.index.IndexReader;import org.apache.lucene.index.IndexWriter;import org.apache.lucene.index.IndexWriterConfig;import org.apache.lucene.index.IndexWriterConfig.OpenMode;import org.apache.lucene.index.Term;import org.apache.lucene.search.IndexSearcher;import org.apache.lucene.search.PhraseQuery;import org.apache.lucene.search.Query;import org.apache.lucene.search.ScoreDoc;import org.apache.lucene.search.TermQuery;import org.apache.lucene.search.TopDocs;import org.apache.lucene.store.Directory;import org.apache.lucene.store.FSDirectory;import org.apache.lucene.util.Version;/** * @ClassName:LuceneQuery.java * @Description: 搜索流程中的第二步就是构建一个Query，多种查询 * @author gaoguangjin * @Date 2015-7-14 下午1:39:44 */@Slf4jpublic class LuceneQuery {    static IndexReader ir;    static IndexWriter iw;    static IndexSearcher is;    private final static String INDEX_FILE = "d:/ftp/index";    // 运行此例子需要先运行LuceneTest.java 创建好索引    public static void main(String[] args) {        try {            // 按词条搜索—TermQuery            termQuery();            // 多关键字的搜索—PhraseQuery            phraseQuery();            /**以下略，用到时候再深入把**/            // 与或搜索BooleanQuery            // 在某一范围内搜索RangeQuery            // 使用前缀搜索PrefixQuery            // 使用短语缀搜索PhrasePrefixQuery            // 相近词语的搜索FuzzyQuery            // 使用通配符搜索WildcardQuery        } catch (Exception e) {            log.error("查询失败！" + e.getLocalizedMessage());        }    }    /**     * @Description: 用户在搜索引擎中进行搜索时，常常查找的并非是一个简单的单词，很有可能是几个不同的关键字     * @see:setSlop()方法来设定一个称之为“坡度”的变量来确定关键字之间是否允许、允许多少个无关词汇的存在     * @see:分词的时候用的是standardAnalyzer()分词器     * @see:代索内容是 Students should be allowed to go out with their friends, but not allowed to drink beer     * @see:索引里面忽略掉常用词语之后是 Students should  allowed  go out friends allowed  drink beer     * @return:void     * @throws IOException     */    private static void phraseQuery() throws IOException {        is = getIndexSercher();        // 第一种情况，两个词本身紧密相连，先设置坡度为0，再设置坡度为2        PhraseQuery pq = new PhraseQuery();        Term term = new Term("contents", "students");        pq.add(term);        Term term2 = new Term("contents", "should");        pq.add(term2);        // 第二种情况，坡度为一个allowed长度3 go out friends allowed        PhraseQuery pq2 = new PhraseQuery();        Term term3 = new Term("contents", "go");        Term term4 = new Term("contents", "allowed");        pq2.add(term3);        pq2.add(term4);        // 两个短语之间最多不能超过三个单词        pq2.setSlop(3);        // 打印展现        display(pq, "多关键字的搜索—PhraseQuery");        display(pq2, "多关键字的搜索—PhraseQuery-带坡度 go out friends allowed");        // 关闭流        ir.close();    }    /**     * @Description: 最基本的搜索单位，从本质上来讲一个词条其实就是一个名/值对     * @throws IOException     * @return:void     */    private static void termQuery() throws IOException {        is = getIndexSercher();        // 分词器        Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_40);        // 在所有contents里面查询包含students的索引文档 存进去的都是小写的        Term term = new Term("contents", "students");        TermQuery query = new TermQuery(term);        // 打印展现        display(query, "按词条搜索—TermQuery");        // 关闭流        ir.close();    }    private static void display(Query query, String typeName) throws IOException {        log.info("************************" + typeName + "******************************");        // 命中topdocs        TopDocs topdocs = is.search(query, 100);        ScoreDoc[] scoreDocs = topdocs.scoreDocs;        for (ScoreDoc scoreDoc : scoreDocs) {            int docID = scoreDoc.doc;            Document document = is.doc(docID);            log.info("索引文档编号docID=" + docID + "======content:" + document.get("contents"));        }        System.out.println();    }    /**     * @Description:获取indexWriter     * @throws IOException     * @return:IndexWriter     */    private static IndexWriter getIndexWriter() throws IOException {        File indexFile = new File(INDEX_FILE);        Directory directory = FSDirectory.open(new File(INDEX_FILE));        // 分词器        Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_40);        // 配置        IndexWriterConfig indexwc = new IndexWriterConfig(Version.LUCENE_40, analyzer);        // 创建新的索引文件时候 追加到已有的索引库        indexwc.setOpenMode(OpenMode.CREATE_OR_APPEND);        return new IndexWriter(directory, indexwc);    }    /**     * @Description:获得搜索器     * @throws IOException     * @return:IndexSearcher     */    private static IndexSearcher getIndexSercher() throws IOException {        File indexFile = new File(INDEX_FILE);        Directory directory = FSDirectory.open(new File(INDEX_FILE));        // 分词器        Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_40);        ir = DirectoryReader.open(directory);        return new IndexSearcher(ir);    }}