将Hibernate Search集成进已有项目中,实现全文检索功能
本来是准备使用Lucene的但是新版本的API过于繁琐,最后还是决定使用Hibernate Search来实现全文检索。这篇博文以我以前做的博客为例来实现全文检索。
1、修改Hibernate配置文件,因为我的系统采用的是SSH2来开发的所以我修改的是spring配置文件
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop> <prop key="hibernate.hbm2ddl.auto">update</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.search.default.directory_provider">filesystem</prop> <prop key="hibernate.search.default.indexBase">E:/index</prop> </props> </property> <property name="mappingResources"> <list> <value>cn/harmel/blog/domain/User.hbm.xml</value> <value>cn/harmel/blog/domain/Category.hbm.xml</value> <value>cn/harmel/blog/domain/Article.hbm.xml</value> <value>cn/harmel/blog/domain/Comment.hbm.xml</value> <value>cn/harmel/blog/domain/Attachment.hbm.xml</value> </list> </property> </bean>
其实就是配置如下两个属性:
hibernate.search.default.directory_provider = filesystem
hibernate.search.default.indexBase = 索引存储目录
2、给实体标注注解
package cn.harmel.blog.domain; import java.util.Date; import java.util.HashSet; import java.util.Set; import org.hibernate.search.annotations.Analyzer; import org.hibernate.search.annotations.DocumentId; import org.hibernate.search.annotations.Field; import org.hibernate.search.annotations.Indexed; import org.wltea.analyzer.lucene.IKAnalyzer; /** * 文章 * * @author Harmel * */ @Indexed @Analyzer(impl = IKAnalyzer.class) public class Article { @DocumentId private Long id; @Field private String title; @Field private String content; @Field private String description; private Date postTime; private Date lastEditTime; private int viewCount; private Category category; private Set<Comment> comments = new HashSet<Comment>(); private Set<Attachment> attachments = new HashSet<Attachment>(); // 此处省略一些getter和setter方法 //........ }
注解说明:
@Indexed:让实体支持索引
@Analyzer :设置分词器,我这里使用的是开源的IK中文分词器
@DocumentID:索引文档ID
@Field :索引字段,该注解默认属性值为
store=Store.NO:是否将数据存储在索引中,经实验无论store=Store.NO还是store=Store.YES都不会影响最终的搜索。如果store=Store.NO值是通过数据库中获取,如果store=Store.YES值是直接从索引文档中获取。
index=Index.YES:是否索引
analyze=Analyze.YES:是否分词
标注了注解后的实体在保存和更新的时候,会自动生成或修改索引。
3、查询索引
public PageModel<Article> searchArticle(int pageNum, int pageSize, String keyword) { FullTextSession fts = Search.getFullTextSession(sessionFactory.getCurrentSession()); QueryBuilder qb = fts.getSearchFactory().buildQueryBuilder().forEntity(Article.class).get(); Query luceneQuery = qb.keyword().onFields("title", "content", "description").matching(keyword).createQuery(); FullTextQuery query = fts.createFullTextQuery(luceneQuery, Article.class); query.setFirstResult((pageNum - 1) * pageSize); query.setMaxResults(pageSize); List<Article> data = query.list(); //封装分页数据 PageModel<Article> model = new PageModel<>(pageNum, pageSize, data.size()); //将数据高亮 model.setData(SearchUtils.hightLight(luceneQuery, data, "title", "content", "description")); return model; }
将数据高亮工具方法
/** * 高亮显示文章 * * @param query {@link org.apache.lucene.search.Query} * @param data 未高亮的数据 * @param fields 需要高亮的字段 * @return 高亮数据 */ public static List<Article> hightLight(Query query, List<Article> data, String... fields) { List<Article> result = new ArrayList<Article>(); Formatter formatter = new SimpleHTMLFormatter("<b style=\"color:red\">", "</b>"); QueryScorer queryScorer = new QueryScorer(query); Highlighter highlighter = new Highlighter(formatter, queryScorer); // 使用IK中文分词 Analyzer analyzer = new IKAnalyzer(); for (Article a : data) { // 构建新的对象进行返回,避免页面错乱(我的页面有错乱) Article article = new Article(); for (String fieldName : fields) { // 获得字段值,并给新的文章对象赋值 Object fieldValue = ReflectionUtils .invokeMethod(BeanUtils.getPropertyDescriptor(Article.class, fieldName).getReadMethod(),a); ReflectionUtils.invokeMethod(BeanUtils.getPropertyDescriptor(Article.class, fieldName).getWriteMethod(), article, fieldValue); String hightLightFieldValue = null; try { hightLightFieldValue = highlighter.getBestFragment(analyzer, fieldName, String.valueOf(fieldValue)); } catch (Exception e) { throw new RuntimeException("高亮显示关键字失败", e); } // 如果高亮成功则重新赋值 if (hightLightFieldValue != null) { ReflectionUtils.invokeMethod(BeanUtils.getPropertyDescriptor(Article.class, fieldName).getWriteMethod(), article,hightLightFieldValue); } } // 赋值ID ReflectionUtils.invokeMethod(BeanUtils.getPropertyDescriptor(Article.class, "id").getWriteMethod(), article, a.getId()); result.add(article); } return result; }
4、页面迭代显示
<s:iterator value="#request.pageModel.data"> <div class="article"> <div class="article_title_area"> <span class="article_title"><a href="${pageContext.request.contextPath }/article/show.action?id=${id }">${title }</a></span> <span class="article_date">发表时间:<s:date name="postTime" format="yyyy-MM-dd HH:mm:ss"/></span> </div> <div class="article_content">${description }</div> <div class="article_count_info"> <span>阅读(${viewCount })</span> <span>评论(${comments.size() })</span> </div> </div> </s:iterator>来自:http://my.oschina.net/harmel/blog/491159
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