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| 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.*;
public class LuceneIndex {
private Directory dir=null;
private IndexWriter getWriter()throws Exception{
dir= FSDirectory.open(Paths.get("C://lucene"));
SmartChineseAnalyzer analyzer=new SmartChineseAnalyzer();
IndexWriterConfig iwc=new IndexWriterConfig(analyzer);
IndexWriter writer=new IndexWriter(dir, iwc);
return writer;
}
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));
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();
}
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();
}
public void deleteIndex(String userId)throws Exception{
IndexWriter writer=getWriter();
writer.deleteDocuments(new Term("id", userId));
writer.forceMergeDeletes();
writer.commit();
writer.close();
}
public List<User> searchBlog(String q)throws Exception{
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();
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);
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;
}
}
|
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