package com.crossoverJie.lucene;
import com.crossoverJie.pojo.User;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.cn.smart.SmartChineseAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.*;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.*;
import org.apache.lucene.search.highlight.*;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import java.io.StringReader;
import java.nio.file.Paths;
import java.util.LinkedList;
import java.util.List;
import com.crossoverJie.util.*;
* 博客索引类
*
@author Administrator
*
*/
public
class LuceneIndex {
private Directory dir=
null;
* 获取IndexWriter实例
*
@return
*
@throws Exception
*/
private IndexWriter getWriter()throws Exception{
* 生成的索引我放在了C盘，可以根据自己的需要放在具体位置
*/
dir= FSDirectory.open(Paths.get(
"C://lucene"));
SmartChineseAnalyzer analyzer=
new SmartChineseAnalyzer();
IndexWriterConfig iwc=
new IndexWriterConfig(analyzer);
IndexWriter writer=
new IndexWriter(dir, iwc);
return writer;
}
* 添加博客索引
*
@param user
*/
public void addIndex(User user)throws Exception{
IndexWriter writer=getWriter();
Document doc=
new Document();
doc.add(
new StringField(
"id",String.valueOf(user.getUserId()), Field.Store.YES));
* yes是会将数据存进索引，如果查询结果中需要将记录显示出来就要存进去，如果查询结果
* 只是显示标题之类的就可以不用存，而且内容过长不建议存进去
* 使用TextField类是可以用于查询的。
*/
doc.add(
new TextField(
"username", user.getUsername(), Field.Store.YES));
doc.add(
new TextField(
"description",user.getDescription(), Field.Store.YES));
writer.addDocument(doc);
writer.close();
}
* 更新博客索引
*
@param user
*
@throws Exception
*/
public void updateIndex(User user)throws Exception{
IndexWriter writer=getWriter();
Document doc=
new Document();
doc.add(
new StringField(
"id",String.valueOf(user.getUserId()), Field.Store.YES));
doc.add(
new TextField(
"username", user.getUsername(), Field.Store.YES));
doc.add(
new TextField(
"description",user.getDescription(), Field.Store.YES));
writer.updateDocument(
new Term(
"id", String.valueOf(user.getUserId())), doc);
writer.close();
}
* 删除指定博客的索引
*
@param userId
*
@throws Exception
*/
public void deleteIndex(String userId)throws Exception{
IndexWriter writer=getWriter();
writer.deleteDocuments(
new Term(
"id", userId));
writer.forceMergeDeletes();
writer.commit();
writer.close();
}
* 查询用户
*
@param q 查询关键字
*
@return
*
@throws Exception
*/
public List<User> searchBlog(String q)throws Exception{
* 注意的是查询索引的位置得是存放索引的位置，不然会找不到。
*/
dir= FSDirectory.open(Paths.get(
"C://lucene"));
IndexReader reader = DirectoryReader.open(dir);
IndexSearcher is=
new IndexSearcher(reader);
BooleanQuery.Builder booleanQuery =
new BooleanQuery.Builder();
SmartChineseAnalyzer analyzer=
new SmartChineseAnalyzer();
* username和description就是我们需要进行查找的两个字段
* 同时在存放索引的时候要使用TextField类进行存放。
*/
QueryParser parser=
new QueryParser(
"username",analyzer);
Query query=parser.parse(q);
QueryParser parser2=
new QueryParser(
"description",analyzer);
Query query2=parser2.parse(q);
booleanQuery.add(query, BooleanClause.Occur.SHOULD);
booleanQuery.add(query2, BooleanClause.Occur.SHOULD);
TopDocs hits=is.search(booleanQuery.build(),
100);
QueryScorer scorer=
new QueryScorer(query);
Fragmenter fragmenter =
new SimpleSpanFragmenter(scorer);
* 这里可以根据自己的需要来自定义查找关键字高亮时的样式。
*/
SimpleHTMLFormatter simpleHTMLFormatter=
new SimpleHTMLFormatter(
"<b><font color='red'>",
"</font></b>");
Highlighter highlighter=
new Highlighter(simpleHTMLFormatter, scorer);
highlighter.setTextFragmenter(fragmenter);
List<User> userList=
new LinkedList<User>();
for(ScoreDoc scoreDoc:hits.scoreDocs){
Document doc=is.doc(scoreDoc.doc);
User user=
new User();
user.setUserId(Integer.parseInt(doc.get((
"id"))));
user.setDescription(doc.get((
"description")));
String username=doc.get(
"username");
String description=doc.get(
"description");
if(username!=
null){
TokenStream tokenStream = analyzer.tokenStream(
"username",
new StringReader(username));
String husername=highlighter.getBestFragment(tokenStream, username);
if(StringUtil.isEmpty(husername)){
user.setUsername(username);
}
else{
user.setUsername(husername);
}
}
if(description!=
null){
TokenStream tokenStream = analyzer.tokenStream(
"description",
new StringReader(description));
String hContent=highlighter.getBestFragment(tokenStream, description);
if(StringUtil.isEmpty(hContent)){
if(description.length()<=
200){
user.setDescription(description);
}
else{
user.setDescription(description.substring(
0,
200));
}
}
else{
user.setDescription(hContent);
}
}
userList.add(user);
}
return userList;
}
}
本文介绍如何在SSM框架中整合Lucene实现全文检索功能，包括配置Maven依赖、创建Lucene工具类及实现用户信息的索引添加、更新、删除和查询等功能。
重新生成索引按钮生成一遍索引之后才能进行搜索，因为现在的数据是直接存到数据库中的，并没有在新增的时候就增加索引，在实际开发的时候需要在新增数据那里再生成一份索引，就直接调用
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