亚洲毛片在线观看_ Lucene（3.5）的幾個(gè)查詢(xún)

幾個(gè)查詢(xún)用法如下代碼：

其中

數字范圍查詢(xún)：索引時(shí)字段保存為

new NumericField(name, Field.Store.YES(NO), true(false).setIntValue( num );

Query numericRangeQuery = NumericRangeQuery.newIntRange("size", 20, 150, true, true);

時(shí)間范圍查詢(xún)，其實(shí)就是數字范圍查詢(xún)，因為都知道Date是根據一個(gè)long 型變量構造出來(lái)的

所以用法同上，只不過(guò)需要對傳入的日期格式轉換成long

[java] view plain copy ?

public class QueryTest {
@Test
public void testTermQuery() throws Exception {
// Term t = new Term("content", "服裝");
Term term = new Term("size", "53");
TermQuery termQuery = new TermQuery(term);
doSearch(termQuery);
}
@Test
public void testRangeQuery() throws Exception {
// 通過(guò)范圍查找，這里比較的是字符串, 所以實(shí)際 20 比 150 大，即找不到結果
// Query termRangeQuery = new TermRangeQuery("size", "020", "150", true, true);
//雖然可以通過(guò)給20 補0 （即 020）實(shí)現20和150的比較，不過(guò)太麻煩，而且不同的情況補0也不同
//Lucene 提供了NumberTools.longToString(num), 已過(guò)時(shí)
//查看api， NumberTools類(lèi)已被NumericUtils代替
//修改如下還是出不來(lái)想要的結果，
//
// Query termRangeQuery = new TermRangeQuery("size", NumericUtils.longToPrefixCoded(20L), NumericUtils.longToPrefixCoded(150L), true, true);
//結果new了半天都沒(méi)new出來(lái)，繼續查api：
//You create a new NumericRangeQuery with the static factory methods, eg:
//Query q = NumericRangeQuery.newFloatRange("weight", 0.03f, 0.10f, true, true);
//換了半天總與出來(lái)了，原因是建立索引時(shí)：使用的Field，而使用NumericRangeQuery，必須使用NumericField：
//api:
//A Query that matches numeric values within a specified range. To use this,
//you must first index the numeric values using NumericField (expert: NumericTokenStream).
//If your terms are instead textual, you should use TermRangeQuery.
//NumericRangeFilter is the filter equivalent of this query.
//numericField有別于Field的幾點(diǎn)：
//NumericField size = new NumericField("size", Field.Store.YES, true);
//size.setLongValue(file.length());
Query numericRangeQuery = NumericRangeQuery.newLongRange("size", 20L, 150L, true, true);
doSearch(numericRangeQuery);
}
@Test
public void testPrefixQuery() throws Exception {
//Term term = new Term("content", "子");//如果存在“子”開(kāi)頭的分詞，就符合條件查出來(lái)了
Term term = new Term("name", "j");//如果存在“子”開(kāi)頭的分詞，就符合條件查出來(lái)了
PrefixQuery prefixQuery = new PrefixQuery(term);
doSearch(prefixQuery);
}
@Test
public void testBooleanQuery() throws Exception {
//query 1
//查詢(xún)時(shí)間符合以下min_time到max_time區間段的文件
long min_time = 1334485513724L - 1000L;
long max_time = 1334485513724L + 1000L;
Query num_range_query = NumericRangeQuery.newLongRange("date", min_time, max_time, true, true);
//query 2
Query termQuery = new TermQuery(new Term("name", "test"));//那么重存在test
//query 3
Query prefixQuery = new PrefixQuery(new Term("name", "j"));
BooleanQuery booleanQuery = new BooleanQuery();
booleanQuery.add(num_range_query, BooleanClause.Occur.MUST);//查詢(xún)結果一定要在以上時(shí)間范圍區間
booleanQuery.add(termQuery, BooleanClause.Occur.MUST_NOT);//查詢(xún)結果不能包含name=test的結果
booleanQuery.add(prefixQuery, BooleanClause.Occur.SHOULD);//可選項
doSearch(booleanQuery);
}
@Test
public void testPhraseQuery() throws Exception {
PhraseQuery phraseQuery = new PhraseQuery();
//為什么就沒(méi)有add(term) 方法呢？
//因為Query類(lèi)里面沒(méi)有此方法
//Query phraseQuery = new PhraseQuery();
String[] strs = {"quick", "brown", "jumped", "lazy"};
//the quick brown fox jumped over the lazy dog
//quick--1->brown, brown--2->jumped, jumped--3->lazy, 所以slop設成3才會(huì )有結果搜到
//前面的單詞要移動(dòng)slop次到達后面的單詞（相鄰的單詞）, 需要注意的是brown-->jumped和 jumped-->brown需要的slop值不同
//參考《Lucene 實(shí)戰（第二版）lucene in action》 P92
phraseQuery.setSlop(3);
for(String s: strs){
phraseQuery.add(new Term("content", s));
}
doSearch(phraseQuery);
}
/**
* 使用通配符查詢(xún)，可能會(huì )降低系統性能
* @throws Exception
*/
@Test
public void testWildcardQuery() throws Exception {
//Term term = new Term("name", "ja?a");//? 匹配單個(gè)
Term term = new Term("content", "全*大");//* 匹配所有
Query wildcardQuery = new WildcardQuery(new Term("name", "j*a"));
doSearch(wildcardQuery);
}
/**
* 模糊查詢(xún)
* @throws Exception
*/
@Test
public void testFuzzyQuery() throws Exception {
Term term = new Term("name", "jeav");//通過(guò)jeav與實(shí)際字段的相似程度查詢(xún)
Query fuzzyQuery = new FuzzyQuery(term);
doSearch(fuzzyQuery);
}
private void doSearch(Query query) throws Exception{
Directory dir = FSDirectory.open(new File("E:/lucene/index"));
IndexReader reader = IndexReader.open(dir);
IndexSearcher searcher = new IndexSearcher(reader);
TopDocs hits = searcher.search(query, 100);
System.out.println("共找到" + hits.totalHits + "條記錄");
ScoreDoc[] docs = hits.scoreDocs;
for(int i = 0; i < docs.length; i++){
int docId = docs[i].doc;
Document doc = searcher.doc(docId);
System.out.println("name: " + doc.get("name"));
System.out.println("size: " + doc.get("size"));
System.out.println("content: " + doc.get("content"));
}
searcher.close();
}
}

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