github里边代码搜索用的什么全文搜索引擎？

Question

github里边代码搜索用的什么全文搜索引擎？

Answer 1

elasticsearch

Answer 2

这个也不知道人家是用什么东西，不过我可以给点lucene的代码，原理是一样的

public Map<String,Object>  articleSearchAlgorithms(SearchCondition condition,IndexSearcher searcher) throws ParseException, IOException{
         
            Map<String,Object> map =new HashMap<String,Object>();
             String[] filedsList=condition.getFiledsList();
             String keyWord=condition.getKeyWord();
             int currentPage=condition.getCurrentPage();
             int pageSize=condition.getPageSize();
             String sortField=condition.getSortField();
             boolean isASC=condition.isDESC();
             String sDate=condition.getsDate();
            String eDate=condition.geteDate();
            String classify=condition.getClassify();
             
            
            //过滤终结字符
            keyWord=escapeExprSpecialWord(keyWord);
            
            BooleanQuery q1 = new BooleanQuery();
            BooleanQuery q2 = new BooleanQuery();
             BooleanQuery booleanQuery = new BooleanQuery(); //boolean查询
             
             if(classify!=null&&(classify.equals("guanzhi")||classify.equals("opinion")||classify.equals("write"))){
                 String typeId="1";//默认言论
                 if(classify.equals("guanzhi")){
                     typeId="2";
                 }
                 if(classify.equals("opinion")){
                     typeId="3";
                 }
                 Query termQuery = new TermQuery(new Term("typeId",typeId)); 
                 q1.add(termQuery,BooleanClause.Occur.MUST);
             }

             if(sDate!=null&&eDate!=null){//是否范围查询由这两个参数决定
                Query rangeQuery = new TermRangeQuery("writingTime", new BytesRef(sDate), new BytesRef(eDate),true, true);
                q1.add(rangeQuery,BooleanClause.Occur.MUST);
             }

            Sort sort = new Sort(); // 排序
            sort.setSort(SortField.FIELD_SCORE);
            if(sortField!=null){
                sort.setSort(new SortField(sortField, SortField.Type.STRING, isASC));
            }
            
            int start = (currentPage - 1) * pageSize;
            int hm = start + pageSize;
            
            TopFieldCollector res = TopFieldCollector.create(sort,hm,false, false, false, false);

            //完全匹配查询
            Term t0=new Term(filedsList[1],keyWord);
            TermQuery termQuery = new TermQuery(t0);//两种高度匹配的查询
            q2.add(termQuery,BooleanClause.Occur.SHOULD);
            
            //前缀匹配
            Term t1=new Term(filedsList[1],keyWord);
            PrefixQuery prefixQuery=new PrefixQuery(t1);
            q2.add(prefixQuery,BooleanClause.Occur.SHOULD);
            
            //短语，相似度匹配，适用于分词的内容
            for(int i=0;i<filedsList.length;i++){ //多字段term查询算法
                if(i!=1){
                    PhraseQuery phraseQuery=new PhraseQuery();
                    Term ts0=new Term(filedsList[i],keyWord);
                    phraseQuery.add(ts0);
                    
                    FuzzyQuery fQuery=new FuzzyQuery(new Term(filedsList[i],keyWord),2);//最后相似度查询
                    
                    q2.add(phraseQuery,BooleanClause.Occur.SHOULD);
                    q2.add(fQuery,BooleanClause.Occur.SHOULD);//后缀相似的拿出来
                }
            }

            MultiFieldQueryParser  queryParser = new MultiFieldQueryParser(Version.LUCENE_47,filedsList,analyzer);
            queryParser.setDefaultOperator(QueryParser.AND_OPERATOR);
            Query query = queryParser.parse(keyWord);

            q2.add(query,BooleanClause.Occur.SHOULD);
            
            //必须加逻辑判断，否则结果是不同的
            if(q1!=null && q1.toString().length()>0){
                booleanQuery.add(q1,BooleanClause.Occur.MUST);
            }
            if(q2!=null && q2.toString().length()>0){
                 booleanQuery.add(q2,BooleanClause.Occur.MUST);
            }
            
            searcher.search(booleanQuery, res);
            long amount = res.getTotalHits(); 
            TopDocs tds = res.topDocs(start, pageSize);
            map.put("amount",amount);
            map.put("tds",tds);
            map.put("query",booleanQuery);
            return map;
    }

原文在这里：http://www.cnblogs.com/huangx...