首页 > 代码库 > Lucene系列：（8）搜索结果摘要
Lucene系列：（8）搜索结果摘要
如果搜索结果内容太多，我们只想显示前几个字符， 必须与高亮一起使用
TestFragment.java
package com.rk.lucene.e_fragment;
import java.util.ArrayList;
import java.util.List;
import org.apache.lucene.document.Document;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.highlight.Formatter;
import org.apache.lucene.search.highlight.Fragmenter;
import org.apache.lucene.search.highlight.Highlighter;
import org.apache.lucene.search.highlight.QueryScorer;
import org.apache.lucene.search.highlight.Scorer;
import org.apache.lucene.search.highlight.SimpleFragmenter;
import org.apache.lucene.search.highlight.SimpleHTMLFormatter;
import org.junit.Test;
import com.rk.lucene.entity.Article;
import com.rk.lucene.utils.LuceneUtils;
public class TestFragment {
@Test
public void testAdd() throws Exception{
List<Article> list = new ArrayList<Article>();
list.add(new Article(1, "疾风之刃", "《疾风之刃》是一款超动作3D动漫风网游。作为新一代动作游戏,《疾风之刃》呈现出极致华丽的动作表演,精心打磨出的打击感震撼人心。"));
list.add(new Article(2, "月光疾风", "月光疾风，日本动漫《火影忍者》中的人物，比较个人主义，性格温和。火之国木叶村的特别上忍，中忍考试正赛预选的考官，体质似乎很不好，有着严重的黑眼圈、脸色苍白且经常咳嗽，善用剑术。"));
list.add(new Article(3, "疾风航班中文版下载", "《疾风航班》是一款优质的动作模拟游戏。游戏中包括亚欧美洲，乃至飞往太空的5条航线，共计50个循序渐进的关卡，以及具有挑战性的Expert级别评定，每个关卡结束后还可进入商店对主角和飞机进..."));
list.add(new Article(4, "八神疾风", "八神疾风（CV：植田佳奈）是日本动漫《魔法少女奈叶A‘s》首次登场的女角色。暗之书事件中心人物，时空管理局魔导师，擅长贝尔卡式广域·远程魔法。"));
list.add(new Article(5, "逝去的疾风", "大战中飞得最快的日本飞机，恐怕要数“疾风”战斗机了，它由中岛飞机厂研制生产，制式型号为： 四式单（座）战（斗机），代号キ-84（读作 Ki-84）。"));
list.add(new Article(6, "疾风剑豪 亚索", "亚索是一个百折不屈的男人,还是一名身手敏捷的剑客,能够运用风的力量来斩杀敌人。这位曾经春风得意的战士因为诬告而身败名裂,并且被迫卷入了一场令人绝望的生存之..."));
list.add(new Article(7, "疾风知劲草", "疾风知劲草，谓在猛烈的大风中，可看出什么样的草是强劲的。比喻意志坚定，经得起考验。出自《东观汉记·王霸传》：“上谓霸曰：‘颍川从我者皆逝，而子独留，始验疾风知劲草。..."));
LuceneUtils.addAll(list);
}
@Test
public void testSearch() throws Exception{
List<Article> list = new ArrayList<Article>();
String keyword = "疾风";
QueryParser queryParser = new QueryParser(LuceneUtils.getVersion(),"content", LuceneUtils.getAnalyzer());
Query query = queryParser.parse(keyword);
IndexSearcher indexSearcher = new IndexSearcher(LuceneUtils.getDirectory());
TopDocs topDocs = indexSearcher.search(query, 10000);
Formatter formatter = new SimpleHTMLFormatter("<font color=‘red‘>", "</font>");
Scorer scorer = new QueryScorer(query);
Highlighter titleHighlighter = new Highlighter(formatter, scorer);
Highlighter contentHighlighter = new Highlighter(formatter, scorer);
Fragmenter titleFragmenter = new SimpleFragmenter(6);
Fragmenter contentFragmenter = new SimpleFragmenter(20);
titleHighlighter.setTextFragmenter(titleFragmenter);
contentHighlighter.setTextFragmenter(contentFragmenter);
for(int i=0;i<topDocs.scoreDocs.length;i++){
ScoreDoc scoreDoc = topDocs.scoreDocs[i];
int docIndex = scoreDoc.doc;
Document document = indexSearcher.doc(docIndex);
System.out.println("编号为"+document.get("id")+"号的文章得分是" + scoreDoc.score);
String titleValue = titleHighlighter.getBestFragment(LuceneUtils.getAnalyzer(), "title", document.get("title"));
String contentValue = contentHighlighter.getBestFragment(LuceneUtils.getAnalyzer(), "content", document.get("content"));
document.getField("title").setValue(titleValue);
document.getField("content").setValue(contentValue);
Article article = LuceneUtils.document2javabean(document, Article.class);
list.add(article);
}
indexSearcher.close();
for(Article article : list){
System.out.println(article);
}
}
}关键代码
Formatter formatter = new SimpleHTMLFormatter("<font color=‘red‘>", "</font>");
Scorer scorer = new QueryScorer(query);
Highlighter titleHighlighter = new Highlighter(formatter, scorer);
Highlighter contentHighlighter = new Highlighter(formatter, scorer);
Fragmenter titleFragmenter = new SimpleFragmenter(6);
Fragmenter contentFragmenter = new SimpleFragmenter(20);
titleHighlighter.setTextFragmenter(titleFragmenter);
contentHighlighter.setTextFragmenter(contentFragmenter);
String titleValue = titleHighlighter.getBestFragment(LuceneUtils.getAnalyzer(), "title", document.get("title"));
String contentValue = contentHighlighter.getBestFragment(LuceneUtils.getAnalyzer(), "content", document.get("content"));
document.getField("title").setValue(titleValue);
document.getField("content").setValue(contentValue);LuceneUtils.java
package com.rk.lucene.utils;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.Field.Index;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.IndexWriter.MaxFieldLength;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
import com.rk.lucene.entity.Page;
public class LuceneUtils {
private static Directory directory;
private static Version version;
private static Analyzer analyzer;
private static MaxFieldLength maxFieldLength;
private static final String LUCENE_DIRECTORY= "D:/rk/indexDB";
static{
try {
directory = FSDirectory.open(new File(LUCENE_DIRECTORY));
version = Version.LUCENE_30;
analyzer = new StandardAnalyzer(version);
maxFieldLength = MaxFieldLength.LIMITED;
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
//不让外部new当前帮助类的对象
private LuceneUtils(){}
public static <T> void pagination(Page<T> page,String field,String keyword,Class<T> clazz) throws Exception{
QueryParser queryParser = new QueryParser(getVersion(), field, getAnalyzer());
Query query = queryParser.parse(keyword);
IndexSearcher indexSearcher = new IndexSearcher(getDirectory());
TopDocs topDocs = indexSearcher.search(query, 200);
int totalHits = topDocs.totalHits;
int curPage = page.getCurPage();
int pageSize = page.getPageSize();
int quotient = totalHits / pageSize;
int remainder = totalHits % pageSize;
int totalPages = remainder==0 ? quotient : quotient+1;
int startIndex = (curPage-1) * pageSize;
int stopIndex = Math.min(startIndex + pageSize, totalHits);
List<T> list = page.getItems();
if(list == null){
list = new ArrayList<T>();
page.setItems(list);
}
list.clear();
for(int i=startIndex;i<stopIndex;i++){
ScoreDoc scoreDoc = topDocs.scoreDocs[i];
int docIndex = scoreDoc.doc;
Document document = indexSearcher.doc(docIndex);
T t = document2javabean(document, clazz);
list.add(t);
}
page.setTotalPages(totalPages);
page.setTotalItems(totalHits);
indexSearcher.close();
}
public static <T> void add(T t) throws Exception{
Document document = javabean2document(t);
IndexWriter indexWriter = new IndexWriter(getDirectory(), getAnalyzer(), getMaxFieldLength());
indexWriter.addDocument(document);
indexWriter.close();
}
public static <T> void addAll(List<T> list) throws Exception{
IndexWriter indexWriter = new IndexWriter(getDirectory(), getAnalyzer(), getMaxFieldLength());
for(T t : list){
Document doc = javabean2document(t);
indexWriter.addDocument(doc);
}
indexWriter.close();
}
public static <T> void update(String field,String value,T t) throws Exception{
Document document = javabean2document(t);
IndexWriter indexWriter = new IndexWriter(getDirectory(), getAnalyzer(), getMaxFieldLength());
indexWriter.updateDocument(new Term(field,value), document);
indexWriter.close();
}
public static <T> void delete(String field,String value) throws Exception{
IndexWriter indexWriter = new IndexWriter(getDirectory(), getAnalyzer(), getMaxFieldLength());
indexWriter.deleteDocuments(new Term(field,value));
indexWriter.close();
}
/**
* 删除所有记录
*/
public static void deleteAll() throws Exception {
IndexWriter indexWriter = new IndexWriter(getDirectory(), getAnalyzer(), getMaxFieldLength());
indexWriter.deleteAll();
indexWriter.close();
}
/**
* 根据关键字进行搜索
*/
public static <T> List<T> search(String field,String keyword,int topN,Class<T> clazz) throws Exception{
List<T> list = new ArrayList<T>();
QueryParser queryParser = new QueryParser(getVersion(), field, getAnalyzer());
Query query = queryParser.parse(keyword);
IndexSearcher indexSearcher = new IndexSearcher(getDirectory());
TopDocs topDocs = indexSearcher.search(query, topN);
for(int i=0;i<topDocs.scoreDocs.length;i++){
ScoreDoc scoreDoc = topDocs.scoreDocs[i];
int docIndex = scoreDoc.doc;
System.out.println("文档索引号" + docIndex + "，文档得分：" + scoreDoc.score);
Document document = indexSearcher.doc(docIndex);
T entity = (T) document2javabean(document, clazz);
list.add(entity);
}
indexSearcher.close();
return list;
}
/**
* 打印List
*/
public static <T> void printList(List<T> list){
if(list != null && list.size()>0){
for(T t : list){
System.out.println(t);
}
}
}
//将JavaBean转成Document对象
public static Document javabean2document(Object obj) throws Exception{
//创建Document对象
Document document = new Document();
//获取obj引用的对象字节码
Class clazz = obj.getClass();
//通过对象字节码获取私有的属性
java.lang.reflect.Field[] reflectFields = clazz.getDeclaredFields();
//迭代
for(java.lang.reflect.Field reflectField : reflectFields){
//反射
reflectField.setAccessible(true);
//获取字段名
String name = reflectField.getName();
//获取字段值
String value = reflectField.get(obj).toString();
//加入到Document对象中去，这时javabean的属性与document对象的属性相同
document.add(new Field(name, value, Store.YES, Index.ANALYZED));
}
//返回document对象
return document;
}
//将Document对象转换成JavaBean对象
public static <T> T document2javabean(Document document,Class<T> clazz) throws Exception{
T obj = clazz.newInstance();
java.lang.reflect.Field[] reflectFields = clazz.getDeclaredFields();
for(java.lang.reflect.Field reflectField : reflectFields){
reflectField.setAccessible(true);
String name = reflectField.getName();
String value = document.get(name);
BeanUtils.setProperty(obj, name, value);
}
return obj;
}
public static Directory getDirectory() {
return directory;
}
public static void setDirectory(Directory directory) {
LuceneUtils.directory = directory;
}
public static Version getVersion() {
return version;
}
public static void setVersion(Version version) {
LuceneUtils.version = version;
}
public static Analyzer getAnalyzer() {
return analyzer;
}
public static void setAnalyzer(Analyzer analyzer) {
LuceneUtils.analyzer = analyzer;
}
public static MaxFieldLength getMaxFieldLength() {
return maxFieldLength;
}
public static void setMaxFieldLength(MaxFieldLength maxFieldLength) {
LuceneUtils.maxFieldLength = maxFieldLength;
}
}Article.java
package com.rk.lucene.entity;
public class Article {
private Integer id;
private String title;//标题
private String content;//内容
public Article() {
}
public Article(Integer id, String title, String content) {
this.id = id;
this.title = title;
this.content = content;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
@Override
public String toString() {
return "编号: " + id + "\n标题: " + title + "\n内容: " + content +
"\n------------------------------------------------------------------\n";
}
}输出结果：
编号为1号的文章得分是0.32994816 编号为7号的文章得分是0.28870463 编号为4号的文章得分是0.23330858 编号为5号的文章得分是0.23330858 编号为2号的文章得分是0.20414501 编号为3号的文章得分是0.20414501 编号: 1 标题: <font color=‘red‘>疾</font><font color=‘red‘>风</font>之刃 内容: 《<font color=‘red‘>疾</font><font color=‘red‘>风</font>之刃》是一款超动作3D动漫风网游 ------------------------------------------------------------------ 编号: 7 标题: <font color=‘red‘>疾</font><font color=‘red‘>风</font>知劲草 内容: <font color=‘red‘>疾</font><font color=‘red‘>风</font>知劲草，谓在猛烈的大风中，可看出什 ------------------------------------------------------------------ 编号: 4 标题: 八神<font color=‘red‘>疾</font><font color=‘red‘>风</font> 内容: 八神<font color=‘red‘>疾</font><font color=‘red‘>风</font>（CV：植田佳奈）是日本动漫 ------------------------------------------------------------------ 编号: 5 标题: 逝去的<font color=‘red‘>疾</font><font color=‘red‘>风</font> 内容: 大战中飞得最快的日本飞机，恐怕要数“<font color=‘red‘>疾</font> ------------------------------------------------------------------ 编号: 2 标题: 月光<font color=‘red‘>疾</font><font color=‘red‘>风</font> 内容: 月光<font color=‘red‘>疾</font><font color=‘red‘>风</font>，日本动漫《火影忍者》中的人物 ------------------------------------------------------------------ 编号: 3 标题: <font color=‘red‘>疾</font><font color=‘red‘>风</font>航班中 内容: 《<font color=‘red‘>疾</font><font color=‘red‘>风</font>航班》是一款优质的动作模拟游戏 ------------------------------------------------------------------
Lucene系列：（8）搜索结果摘要
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