lucene 高亮显示
2008-08-19 14:02
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package src;
import java.io.StringReader;
import java.util.Date;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.SimpleAnalyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.cjk.CJKAnalyzer;
import org.apache.lucene.analysis.cn.ChineseAnalyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import java.util.Date;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.highlight.Highlighter;
import org.apache.lucene.search.highlight.QueryScorer;
import org.apache.lucene.search.highlight.SimpleFragmenter;
import org.apache.lucene.search.highlight.SimpleHTMLFormatter;
public class LuceneSearch {
public static void main(String[] args) throws Exception{
LuceneSearch test = new LuceneSearch();
//
Hits h = null;
h = test.search("显示 ");
test.printResult(h);
h = test.search("jy*");
test.printResult(h);
h = test.search("djy");
test.printResult(h);
}
public LuceneSearch(){
try{
searcher = new IndexSearcher(IndexReader.open("E://lucene//test4//index"));
}catch(Exception e){
e.printStackTrace();
}
}
//声明一个IndexSearcher对象
private IndexSearcher searcher = null;
//声明一个Query对象
private Query query = null;
ChineseAnalyzer analyzer = new ChineseAnalyzer();
Highlighter highlighter = null;
public final Hits search(String keyword){
System.out.println("正在检索关键字:"+keyword);
try{
QueryParser qp = new QueryParser("title",analyzer);
query = qp.parse(keyword);
Term term = new Term("content",keyword);
FuzzyQuery fq = new FuzzyQuery(term);
Date start = new Date();
//Hits hits = searcher.search(query);
Hits hits = searcher.search(query);
//高亮显示设置
SimpleHTMLFormatter simpleHTMLFormatter = new SimpleHTMLFormatter("<read>","</read>");
highlighter = new Highlighter(simpleHTMLFormatter,new QueryScorer(query));
highlighter.setTextFragmenter(new SimpleFragmenter(10));//这个100是指定关键字字符串的context的长度,你可以自己设定,因为不可能返回整篇正文内容
Date end = new Date();
System.out.println("检索完成,用时"+(end.getTime()-start.getTime())+"毫秒");
return hits;
}catch(Exception e){
e.printStackTrace();
return null;
}
}
public void printResult(Hits h){
if(h.length() == 0){
System.out.println("对不起,没有找到您要的结果.");
}else{
for(int i = 0; i < h.length(); i++){
try{
Document doc = h.doc(i);
System.out.println("这个是"+(i+1)+"个结果:"+doc.get("id")+" title:"+doc.get("title")+" content:"+doc.get("content"));
//高亮出显示
TokenStream tokenStream =analyzer.tokenStream("content", new StringReader(doc.get("title")));
System.out.println(highlighter.getBestFragment(tokenStream,h.doc(i).get("title")));
//System.out.println(doc.get("path"));
}catch(Exception e){
e.printStackTrace();
}
}
}
System.out.println("--------------------------------------");
}
}
private void printResult(Hits h) {
if (h.length() > 0) {
for (int i = 0; i < h.length(); i++) {
SearchResultModel resultModel = new SearchResultModel();
try {
Document doc = h.doc(i);
resultModel.setId(i);
resultModel.setFileName(doc.get("filename"));
resultModel.setUrl(doc.get("path"));
resultModel.setDateTime(doc.get("datetime"));
// 高亮出显示
/*需要注意的是,如果标题或者内容中没有需要高亮显示的关键字,那么标题或者内容是为null,所以做了下面的处理。判断标题或者内容是否空,如果空,截取前面的部分字符。*/
TokenStream tokenStream1 = analyzer.tokenStream("title",
new StringReader(doc.get("title")));
String sTitle = highlighter.getBestFragment(tokenStream1,doc.get("title"));
String sTitle2 = doc.get("title");
resultModel.setTitle(sTitle!=null?sTitle:sTitle2);
TokenStream tokenStream = analyzer.tokenStream("contents",
new StringReader(doc.get("contents")));
String sContent = highlighter.getBestFragment(tokenStream,
doc.get("contents"));
String sContent2 = doc.get("contents");
resultModel.setContent(sContent!=null?sContent:sContent2.substring(0,100)+"...");
} catch (Exception e) {
e.printStackTrace();
}
this.mapResult.put(i, resultModel);
}
}
}
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