[solr] - Facet - autocomplete

Solr的facet可以用于一般性的前缀式自动完成功能，当然，它的主要功能是用于做统计、分类、区间等。

统计、分类、区间功能，可参考下文：

http://hongweiyi.com/2013/03/apache-solr-facet-introduction/

下面例子是使用Facet做前缀式自动完成功能。

 

schema.xml

<?xml version="1.0" ?><schema name="my core" version="1.1">    <fieldtype name="string"  class="solr.StrField" sortMissingLast="true" omitNorms="true"/>    <fieldType name="long" class="solr.TrieLongField" precisionStep="0" positionIncrementGap="0"/>    <fieldType name="tdate" class="solr.TrieDateField" precisionStep="6" positionIncrementGap="0"/>    <fieldType name="int" class="solr.TrieIntField" precisionStep="0" positionIncrementGap="0"/>    <fieldType name="float" class="solr.TrieFloatField" precisionStep="0" positionIncrementGap="0"/>    <fieldType name="double" class="solr.TrieDoubleField" precisionStep="0" positionIncrementGap="0"/>    <fieldType name="boolean" class="solr.BoolField" sortMissingLast="true"/>    <fieldtype name="binary" class="solr.BinaryField"/>    <fieldType name="text_cn" class="solr.TextField">        <analyzer type="index" class="org.wltea.analyzer.lucene.IKAnalyzer" />        <analyzer type="query" class="org.wltea.analyzer.lucene.IKAnalyzer" />    </fieldType>        <!-- general -->    <field name="id" type="long" indexed="true" stored="true" multiValued="false" required="true"/>    <field name="subject" type="text_cn" indexed="true" stored="true" />    <field name="content" type="text_cn" indexed="true" stored="true" />    <field name="category_id" type="long" indexed="true" stored="true" />    <field name="category_name" type="text_cn" indexed="true" stored="true" />    <field name="last_update_time" type="tdate" indexed="true" stored="true" />    <field name="_version_" type="long" indexed="true" stored="true"/>     <!-- field to use to determine and enforce document uniqueness. -->     <uniqueKey>id</uniqueKey>     <!-- field for the QueryParser to use when an explicit fieldname is absent -->     <defaultSearchField>subject</defaultSearchField>     <!-- SolrQueryParser configuration: defaultOperator="AND|OR" -->     <solrQueryParser defaultOperator="OR"/></schema>

 

Java Bean:

package com.my.entity;import java.util.Date;import org.apache.solr.client.solrj.beans.Field;public class Item {    @Field    private long id;    @Field    private String subject;    @Field    private String content;    @Field("category_id")    private long categoryId;    @Field("category_name")    private String categoryName;    @Field("last_update_time")    private Date lastUpdateTime;        public long getId() {        return id;    }    public void setId(long id) {        this.id = id;    }    public String getSubject() {        return subject;    }    public void setSubject(String subject) {        this.subject = subject;    }    public String getContent() {        return content;    }    public void setContent(String content) {        this.content = content;    }    public long getCategoryId() {        return categoryId;    }    public void setCategoryId(long categoryId) {        this.categoryId = categoryId;    }    public String getCategoryName() {        return categoryName;    }    public void setCategoryName(String categoryName) {        this.categoryName = categoryName;    }    public Date getLastUpdateTime() {        return lastUpdateTime;    }    public void setLastUpdateTime(Date lastUpdateTime) {        this.lastUpdateTime = lastUpdateTime;    }}

 

测试：

package com.my.solr;import java.io.IOException;import java.util.ArrayList;import java.util.Date;import java.util.List;import org.apache.solr.client.solrj.SolrQuery;import org.apache.solr.client.solrj.SolrQuery.ORDER;import org.apache.solr.client.solrj.SolrQuery.SortClause;import org.apache.solr.client.solrj.SolrServerException;import org.apache.solr.client.solrj.impl.HttpSolrServer;import org.apache.solr.client.solrj.impl.XMLResponseParser;import org.apache.solr.client.solrj.response.FacetField;import org.apache.solr.client.solrj.response.FacetField.Count;import org.apache.solr.client.solrj.response.QueryResponse;import com.my.entity.Item;public class TestSolr {    public static void main(String[] args) throws IOException, SolrServerException {        String url = "http://localhost:8899/solr/mycore";        HttpSolrServer core = new HttpSolrServer(url);        core.setMaxRetries(1);        core.setConnectionTimeout(5000);        core.setParser(new XMLResponseParser()); // binary parser is used by default        core.setSoTimeout(1000); // socket read timeout        core.setDefaultMaxConnectionsPerHost(100);        core.setMaxTotalConnections(100);        core.setFollowRedirects(false); // defaults to false        core.setAllowCompression(true);        // ------------------------------------------------------        // remove all data        // ------------------------------------------------------        core.deleteByQuery("*:*");        List<Item> items = new ArrayList<Item>();        items.add(makeItem(1, "cpu", "this is intel cpu", 1, "cpu-intel"));        items.add(makeItem(2, "cpu AMD", "this is AMD cpu", 2, "cpu-AMD"));        items.add(makeItem(3, "cpu intel", "this is intel-I7 cpu", 1, "cpu-intel"));        items.add(makeItem(4, "cpu AMD", "this is AMD 5000x cpu", 2, "cpu-AMD"));        items.add(makeItem(5, "cpu intel I6", "this is intel-I6 cpu", 1, "cpu-intel-I6"));        core.addBeans(items);        // commit        core.commit();        // ------------------------------------------------------        // search        // ------------------------------------------------------        SolrQuery query = new SolrQuery();        query.setQuery("*:*");        query.setStart(0);    // query的开始行数(分页使用)        query.setRows(0);    // query的返回行数(分页使用)        query.setFacet(true);    // 设置使用facet        query.setFacetMinCount(1);    // 设置facet最少的统计数量        query.setFacetLimit(10);    // facet结果的返回行数        query.addFacetField("category_name");    // facet的字段        query.setFacetPrefix("cpu");    // facet字段值        query.addSort(new SortClause("id", ORDER.asc));    // 排序        QueryResponse response = core.query(query);        List<Item> items_rep = response.getBeans(Item.class);        List<FacetField> facetFields = response.getFacetFields();        // 因为上面的start和rows均设置为0，所以这里不会有query结果输出        for (Item i : items_rep) {            System.out.println("id=" + i.getId() + "\tcontent=" + i.getContent());        }        // 打印所有facet        for(FacetField ff : facetFields) {            System.out.println("name=" + ff.getName() + "\tcount=" + ff.getValueCount());            System.out.println("--------------------");            for(Count count: ff.getValues() ) {                System.out.println("name=" + count.getName() + "\tvalue=" + count.getCount());            }        }    }        private static Item makeItem(long id, String subject, String content, long categoryId, String categoryName) {        Item item = new Item();        item.setId(id);        item.setSubject(subject);        item.setContent(content);        item.setLastUpdateTime(new Date());        item.setCategoryId(categoryId);        item.setCategoryName(categoryName);        return item;    }}

 

输出结果：