【Lucene3.6.2入门系列】第03节_简述Lucene中常见的搜索功能
2024-10-08 22:42:01
package com.jadyer.lucene; import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date; import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.NumericField;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.NumericRangeQuery;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TermRangeQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.WildcardQuery;
import org.apache.lucene.search.BooleanClause.Occur;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version; /**
* 【Lucene3.6.2入门系列】第03节_简述Lucene中常见的搜索功能
* @create Aug 1, 2013 3:54:27 PM
* @author 玄玉<http://blog.csdn.net/jadyer>
*/
public class HelloSearch {
private Directory directory;
private IndexReader reader;
private String[] ids = {"1", "2", "3", "4", "5", "6"};
private String[] names = {"Michael", "Scofield", "Tbag", "Jack", "Jade", "Jadyer"};
private String[] emails = {"aa@jadyer.us", "bb@jadyer.cn", "cc@jadyer.cc", "dd@jadyer.tw", "ee@jadyer.hk", "ff@jadyer.me"};
private String[] contents = {"my java blog is http://blog.csdn.net/jadyer", "my website is http://www.jadyer.cn", "my name is jadyer", "I am JavaDeveloper", "I am from Haerbin", "I like Lucene"};
private int[] attachs = {9,3,5,4,1,2};
private Date[] dates = new Date[ids.length]; public HelloSearch(){
IndexWriter writer = null;
Document doc = null;
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
try {
dates[0] = sdf.parse("20120601");
dates[1] = sdf.parse("20120603");
dates[2] = sdf.parse("20120605");
dates[3] = sdf.parse("20120607");
dates[4] = sdf.parse("20120609");
dates[5] = sdf.parse("20120611");
directory = FSDirectory.open(new File("myExample/03_index/"));
writer = new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_36, new StandardAnalyzer(Version.LUCENE_36)));
writer.deleteAll(); //创建索引之前,先把文档清空掉
for(int i=0; i<ids.length; i++){ //遍历ID来创建文档
doc = new Document();
doc.add(new Field("id", ids[i], Field.Store.YES, Field.Index.NOT_ANALYZED_NO_NORMS));
doc.add(new Field("name", names[i], Field.Store.YES, Field.Index.ANALYZED_NO_NORMS));
doc.add(new Field("email", emails[i], Field.Store.YES, Field.Index.NOT_ANALYZED));
doc.add(new Field("email", "test"+i+""+i+"@jadyer.com", Field.Store.YES, Field.Index.NOT_ANALYZED));
doc.add(new Field("content", contents[i], Field.Store.NO, Field.Index.ANALYZED));
doc.add(new NumericField("attach", Field.Store.YES, true).setIntValue(attachs[i])); //为数字加索引(第三个参数指定是否索引)
doc.add(new NumericField("attach", Field.Store.YES, true).setIntValue((i+1)*100)); //假设有多个附件
doc.add(new NumericField("date", Field.Store.YES, true).setLongValue(dates[i].getTime())); //为日期加索引
writer.addDocument(doc);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(null != writer){
try {
writer.close();
} catch (IOException ce) {
ce.printStackTrace();
}
}
}
} /**
* 针对分页搜索创建索引
*/
public HelloSearch(boolean pageFlag){
String[] myNames = new String[50];
String[] myContents = new String[50];
for(int i=0; i<50; i++){
myNames[i] = "file(" + i + ")";
myContents[i] = "I love JavaSE, also love Lucene(" + i + ")";
}
IndexWriter writer = null;
Document doc = null;
try {
directory = FSDirectory.open(new File("myExample/03_index/"));
writer = new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_36, new StandardAnalyzer(Version.LUCENE_36)));
writer.deleteAll();
for(int i=0; i<myNames.length; i++){
doc = new Document();
doc.add(new Field("myname", myNames[i], Field.Store.YES, Field.Index.NOT_ANALYZED_NO_NORMS));
doc.add(new Field("mycontent", myContents[i], Field.Store.YES, Field.Index.ANALYZED));
writer.addDocument(doc);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if(null != writer){
try {
writer.close();
} catch (IOException ce) {
ce.printStackTrace();
}
}
}
} /**
* 获取IndexSearcher实例
*/
private IndexSearcher getIndexSearcher(){
try {
if(reader == null){
reader = IndexReader.open(directory);
}else{
//if the index was changed since the provided reader was opened, open and return a new reader; else,return null
//如果当前reader在打开期间index发生改变,则打开并返回一个新的IndexReader,否则返回null
IndexReader ir = IndexReader.openIfChanged(reader);
if(ir != null){
reader.close(); //关闭原reader
reader = ir; //赋予新reader
}
}
return new IndexSearcher(reader);
}catch(Exception e) {
e.printStackTrace();
}
return null; //发生异常则返回null
} /**
* 执行搜索操作
* @param query 搜索的Query对象
*/
private void doSearch(Query query){
IndexSearcher searcher = this.getIndexSearcher();
try {
//第二个参数指定搜索后显示的最多的记录数,其与tds.totalHits没有联系
TopDocs tds = searcher.search(query, 10);
System.out.println("本次搜索到[" + tds.totalHits + "]条记录");
for(ScoreDoc sd : tds.scoreDocs){
Document doc = searcher.doc(sd.doc);
System.out.print("文档编号=" + sd.doc + " 文档权值=" + doc.getBoost() + " 文档评分=" + sd.score + " ");
System.out.print("id=" + doc.get("id") + " email=" + doc.get("email") + " name=" + doc.get("name") + " ");
//获取多个同名域的方式
String[] attachValues = doc.getValues("attach");
for(String attach : attachValues){
System.out.print("attach=" + attach + " ");
}
System.out.println();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if(null != searcher){
try {
searcher.close(); //记得关闭IndexSearcher
} catch (IOException e) {
e.printStackTrace();
}
}
}
} /**
* 精确匹配搜索
* @param fieldName 域名(相当于表的字段名)
* @param keyWords 搜索的关键字
*/
public void searchByTerm(String fieldName, String keyWords){
Query query = new TermQuery(new Term(fieldName, keyWords));
this.doSearch(query);
} /**
* 基于范围的搜索
* @param fieldName 域名(相当于表的字段名)
* @param start 开始字符
* @param end 结束字符
*/
public void searchByTermRange(String fieldName, String start, String end){
Query query = new TermRangeQuery(fieldName, start, end, true, true); //后面两个参数用于指定开区间或闭区间
this.doSearch(query);
} /**
* 针对数字的搜索
*/
public void searchByNumericRange(String fieldName, int min, int max){
Query query = NumericRangeQuery.newIntRange(fieldName, min, max, true, true);
this.doSearch(query);
} /**
* 基于前缀的搜索
* @see 它是对Field分词后的结果进行前缀查找的结果
*/
public void searchByPrefix(String fieldName, String prefix){
Query query = new PrefixQuery(new Term(fieldName, prefix));
this.doSearch(query);
} /**
* 基于通配符的搜索
* @see *-->任意多个字符
* @see ?-->一个字符
*/
public void searchByWildcard(String fieldName, String wildcard){
Query query = new WildcardQuery(new Term(fieldName, wildcard));
this.doSearch(query);
} /**
* 模糊搜索
* @see 与通配符搜索不同
*/
public void searchByFuzzy(String fieldName, String fuzzy){
Query query = new FuzzyQuery(new Term(fieldName, fuzzy));
this.doSearch(query);
} /**
* 多条件搜索
* @see 本例中搜索name值中以Ja开头,且content中包含am的内容
* @see Occur.MUST------表示此条件必须为true
* @see Occur.MUST_NOT--表示此条件必须为false
* @see Occur.SHOULD----表示此条件非必须
*/
public void searchByBoolean(){
BooleanQuery query = new BooleanQuery();
query.add(new WildcardQuery(new Term("name", "Ja*")), Occur.MUST);
query.add(new TermQuery(new Term("content", "am")), Occur.MUST);
this.doSearch(query);
} /**
* 短语搜索
* @see 很遗憾的是短语查询对中文搜索没有太大的作用,但对英文搜索是很好用的,但它的开销比较大,尽量少用
*/
public void searchByPhrase(){
PhraseQuery query = new PhraseQuery();
query.setSlop(1); //设置跳数
query.add(new Term("content", "am")); //第一个Term
query.add(new Term("content", "Haerbin")); //产生距离之后的第二个Term
this.doSearch(query);
} /**
* 基于QueryParser的搜索
*/
public void searchByQueryParse(){
QueryParser parser = new QueryParser(Version.LUCENE_36, "content", new StandardAnalyzer(Version.LUCENE_36));
Query query = null;
try {
// query = parser.parse("Haerbin"); //搜索content中包含[Haerbin]的记录
// query = parser.parse("I AND Haerbin"); //搜索content中包含[I]和[Haerbin]的记录
// query = parser.parse("Lucene OR Haerbin"); //搜索content中包含[Lucene]或者[Haerbin]的记录
// query = parser.parse("Lucene Haerbin"); //搜索content中包含[Lucene]或者[Haerbin]的记录
// parser.setDefaultOperator(Operator.AND); //将空格的默认操作OR修改为AND
// //1)如果name域在索引时,不进行分词,那么无论这里写成[name:Jadyer]还是[name:jadyer],最后得到的都是0条记录
// //2)由于name原值为大写[J],若索引时不对name分词,除非修改name原值为小写[j],并且搜索[name:jadyer]才能得到记录
// query = parser.parse("name:Jadyer"); //修改搜索域为name=Jadyer的记录
// query = parser.parse("name:Ja*"); //支持通配符
// query = parser.parse("\"I am\""); //搜索content中包含[I am]的记录(注意不能使用parse("content:'I am'"))
// parser.setAllowLeadingWildcard(true); //设置允许[*]或[?]出现在查询字符的第一位,即[name:*de],否则[name:*de]会报异常
// query = parser.parse("name:*de"); //Lucene默认的第一个字符不允许为通配符,因为这样效率比较低
// //parse("+am +name:Jade")--------------搜索content中包括[am]的,并且name=Jade的记录
// //parse("am AND NOT name:Jade")--------搜索content中包括[am]的,并且nam不是Jade的记录
// //parse("(blog OR am) AND name:Jade")--搜索content中包括[blog]或者[am]的,并且name=Jade的记录
// query = parser.parse("-name:Jack +I"); //搜索content中包括[I]的,并且name不是Jack的记录(加减号要放到域说明的前面)
// query = parser.parse("id:[1 TO 3]"); //搜索id值从1到3的记录(TO必须大写,且这种方式没有办法匹配数字)
// query = parser.parse("id:{1 TO 3}"); //搜索id=2的记录
query = parser.parse("name:Jadk~"); //模糊搜索
} catch (ParseException e) {
e.printStackTrace();
}
this.doSearch(query);
} /**
* 普通的分页搜索
* @see 适用于lucene3.5之前
* @param expr 搜索表达式
* @param pageIndex 页码
* @param pageSize 分页大小
*/
public void searchPage(String expr, int pageIndex, int pageSize){
IndexSearcher searcher = this.getIndexSearcher();
QueryParser parser = new QueryParser(Version.LUCENE_36, "mycontent", new StandardAnalyzer(Version.LUCENE_36));
try {
Query query = parser.parse(expr);
TopDocs tds = searcher.search(query, pageIndex*pageSize);
ScoreDoc[] sds = tds.scoreDocs;
for(int i=(pageIndex-1)*pageSize; i<pageIndex*pageSize; i++){
Document doc = searcher.doc(sds[i].doc);
System.out.println("文档编号:" + sds[i].doc + "-->" + doc.get("myname") + "-->" + doc.get("mycontent"));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(null != searcher){
try {
searcher.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
} /**
* 基于searchAfter的分页搜索
* @see 适用于Lucene3.5
* @param expr 搜索表达式
* @param pageIndex 页码
* @param pageSize 分页大小
*/
public void searchPageByAfter(String expr, int pageIndex, int pageSize){
IndexSearcher searcher = this.getIndexSearcher();
QueryParser parser = new QueryParser(Version.LUCENE_36, "mycontent", new StandardAnalyzer(Version.LUCENE_36));
try {
Query query = parser.parse(expr);
TopDocs tds = searcher.search(query, (pageIndex-1)*pageSize);
//使用IndexSearcher.searchAfter()搜索,该方法第一个参数为上一页记录中的最后一条记录
if(pageIndex > 1){
tds = searcher.searchAfter(tds.scoreDocs[(pageIndex-1)*pageSize-1], query, pageSize);
}else{
tds = searcher.searchAfter(null, query, pageSize);
}
for(ScoreDoc sd : tds.scoreDocs){
Document doc = searcher.doc(sd.doc);
System.out.println("文档编号:" + sd.doc + "-->" + doc.get("myname") + "-->" + doc.get("mycontent"));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(null != searcher){
try {
searcher.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
下面是JUnit4.x编写的测试
package com.jadyer.test; import java.io.File; import org.junit.Before;
import org.junit.Test; import com.jadyer.lucene.HelloSearch; public class HelloSearchTest {
private HelloSearch hello; @Before
public void init(){
hello = new HelloSearch();
} @Test
public void searchByTerm(){
hello.searchByTerm("content", "my");
} @Test
public void searchByTermRange(){
hello.searchByTermRange("name", "M", "o");
} @Test
public void searchByNumericRange(){
hello.searchByNumericRange("attach", 2, 5);
} @Test
public void searchByPrefix(){
hello.searchByPrefix("content", "b");
} @Test
public void searchByWildcard(){
hello.searchByWildcard("name", "Ja??er");
} @Test
public void searchByFuzzy(){
hello.searchByFuzzy("name", "Jadk");
} @Test
public void searchByBoolean(){
hello.searchByBoolean();
} @Test
public void searchByPhrase(){
hello.searchByPhrase();
} @Test
public void searchByQueryParse(){
hello.searchByQueryParse();
} @Test
public void searchPage(){
for(File file : new File("myExample/03_index/").listFiles()){
file.delete();
}
hello = new HelloSearch(true);
hello.searchPage("mycontent:javase", 2, 10);
} @Test
public void searchPageByAfter(){
for(File file : new File("myExample/03_index/").listFiles()){
file.delete();
}
hello = new HelloSearch(true);
hello.searchPageByAfter("mycontent:javase", 3, 10);
}
}
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