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[solr] - Facet
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Solr facet使用于分类统计，是最好的工具。下面例子使用facet将可模拟查询搜索出租房信息。
1、在schema.xml中的内容如下：
<?
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"
/>
<
analyzer
>
<
tokenizer
class
="solr.KeywordTokenizerFactory"
/>
<
filter
class
="solr.LowerCaseFilterFactory"
/>
</
analyzer
>
</
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
="regionId"
type
="int"
indexed
="true"
stored
="true"
/>
<
field
name
="region"
type
="text_cn"
indexed
="true"
stored
="true"
/>
<
field
name
="categoryId"
type
="int"
indexed
="true"
stored
="true"
/>
<
field
name
="category"
type
="text_cn"
indexed
="true"
stored
="true"
/>
<
field
name
="price"
type
="float"
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>
2、Java bean:
package
com.my.entity;
import
org.apache.solr.client.solrj.beans.Field;
public
class
Item {
@Field
private
long
id;
@Field
private
String subject;
@Field
private
String content;
@Field
private
int
regionId;
@Field
private
int
categoryId;
@Field
private
float
price;
public
long
getId() {
return
id;
}
public
void setId(long id) {
this.id = id;
}
public String getSubject() {
return subject;
}
publicvoid setSubject(String subject) {
this.subject = subject;
}
public String getContent() {
return content;
}
publicvoid setContent(String content) {
this.content = content;
}
publicint getRegionId() {
return regionId;
}
publicvoid setRegionId(int regionId) {
this.regionId = regionId;
}
publicint getCategoryId() {
return categoryId;
}
publicvoid setCategoryId(int categoryId) {
this.categoryId = categoryId;
}
publicfloat getPrice() {
return price;
}
publicvoid setPrice(float price) {
this.price = price;
}
}
3、使用solrj测试例子：
package
com.my.solr;
import
java.io.IOException;
import
java.util.ArrayList;
import
java.util.HashMap;
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
org.apache.solr.common.params.FacetParams;
import
com.my.entity.Item;
public
class
TestSolr {
private
static HashMap<Integer, String> mapRegion = new HashMap<Integer, String>();
privatestatic HashMap<Integer, String> mapCategory = new HashMap<Integer, String>();
publicstaticvoid main(String[] args) throws IOException,
SolrServerException {
// ------------------------------------------------------
// Set map
// ------------------------------------------------------
mapRegion.put(1, "罗湖区");
mapRegion.put(2, "南山区");
mapRegion.put(3, "龙岗区");
mapRegion.put(4, "福田区");
mapCategory.put(1, "单间");
mapCategory.put(2, "2房1厅");
mapCategory.put(3, "3房2厅");
mapCategory.put(4, "1房1厅");
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(items.size() + 1, "龙城公寓一房一厅", "豪华城城公寓1房1厅，拧包入住", 1, 1, 1200f));
items.add(makeItem(items.size() + 1, "兴新宿舍楼 1室0厅", " 中等装修 招女性合租", 1, 1, 1000f));
items.add(makeItem(items.size() + 1, "西丽新屋村新宿舍楼单间", " 无敌装修只招女性", 2, 1, 1000f));
items.add(makeItem(items.size() + 1, "大芬村信和爱琴居地铁口2房1厅", " 地铁口 + 出行便利=居家首选", 3, 2, 2000f));
items.add(makeItem(items.size() + 1, "龙岗富豪花园3房2厅出租", " 离地铁口只要5分钟，快来秒杀吧", 3, 3, 4500f));
items.add(makeItem(items.size() + 1, "海景房园3房2厅出租", "无敌海景，可以看到伦敦", 4, 3, 8500f));
items.add(makeItem(items.size() + 1, "天域花园1房1厅出租", "男女不限，入住免水电一月", 2, 4, 1500f));
items.add(makeItem(items.size() + 1, "神一样的漂亮，玉馨山庄3房2厅", "心动不如行动，拧包即可入住，来吧！", 1, 3, 9500f));
items.add(makeItem(items.size() + 1, "玉馨山庄2房1厅，情侣最爱", "宅男宅女快来吧只要2500，走过路过，别再错过", 1, 2, 2500f));
items.add(makeItem(items.size() + 1, "天域花园3房2厅出租", "都来看看，都来瞄瞄，3房只要7500.", 4, 3, 7500f));
items.add(makeItem(items.size() + 1, "深都花园出租3房2厅", "找爱干净的人氏，全新装修", 4, 3, 5200f));
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(100); // 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("categoryId", "regionId"); // facet的字段 query.setFacetSort(FacetParams.FACET_SORT_COUNT);
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
System.out.println("--------------------");
System.out.println("Search result:");
for (Item item : items_rep) {
System.out.println("id=" + item.getId() + "\tsubject=" + item.getSubject()
+ "\tregion=" + mapRegion.get(item.getRegionId())
+ "\tcategory=" + mapCategory.get(item.getCategoryId())
+ "\tprice=" + item.getPrice());
}
// 打印所有facetfor (FacetField ff : facetFields) {
System.out.println("--------------------");
System.out.println("name=" + ff.getName() + "\tcount=" + ff.getValueCount());
System.out.println("--------------------");
switch (ff.getName()) {
case "regionId":
printOut(mapRegion, ff.getValues());
break;
case "categoryId":
printOut(mapCategory, ff.getValues());
break;
}
}
}
@SuppressWarnings({ "rawtypes" })
privatestaticvoid printOut(HashMap map, List<Count> counts) {
for (Count count : counts) {
System.out.println("name=" + map.get(Integer.parseInt(count.getName())) + "\tcount=" + count.getCount());
}
System.out.println("--------------------");
}
privatestatic Item makeItem(long id, String subject, String content, int regionId, int categoryId, float price) {
Item item = new Item();
item.setId(id);
item.setSubject(subject);
item.setContent(content);
item.setRegionId(regionId);
item.setCategoryId(categoryId);
item.setPrice(price);
return item;
}
}
运行结果：
如果把测试例子中的这句query:
query.setQuery("*:*");
修改为：
query.setQuery("subject:*出租* && price:[1000 TO 8000]");
运行结果将为：
如果将：
query.setFacetMinCount(1); // 设置facet最少的统计数量
修改为：
query.setFacetMinCount(0); // 设置facet最少的统计数量
运行结果为：
比较上面两个运行结果图可以看出，这个setFacetMinCount(...)方法是过滤将最少统计量的数据
当然，也可以使用solr admin的浏览器地址栏进行访问查询：
http://localhost:8899/solr/mycore/select?q=subject:*出租* AND price :[1000TO8000]&wt=json&indent=true&facet=true&facet.field=categoryId&facet.field=regionId&facet.sort=count
运行输出：
原文：http://www.cnblogs.com/HD/p/3998321.html
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