Mongodb 实现模糊查询

import com.mongodb.*;
import java.util.regex.Pattern;

public class MongoColl {
    private static MongoClient mongoClient = new MongoClient("127.0.0.1", 27017);

    public DBCollection collection(String dbName, String collection){
        return mongoClient.getDB(dbName).getCollection(collection);
    }

    public static void main(String[] args){
        DBCollection collection = new MongoColl().collection("text", "text");
        String reg = "asd";
        Pattern pattern = Pattern.compile("^" + reg + ".*$", Pattern.CASE_INSENSITIVE);

        DBObject regex = new BasicDBObject();
        regex.put("$regex", pattern);

        DBObject query2 = new BasicDBObject("name", regex);
        DBCursor cursor = collection.find(query2);
        if (cursor.hasNext()){
            DBObject object2 = cursor.next();
            System.out.println(object2.toString());
        }

    }
}

　　以上代码是实现Mongo模糊查询左匹配，亲测可用。

　　

 //完全匹配
Pattern pattern = Pattern.compile("^name$", Pattern.CASE_INSENSITIVE);
    //右匹配
Pattern pattern = Pattern.compile("^.*name$", Pattern.CASE_INSENSITIVE);
    //左匹配
Pattern pattern = Pattern.compile("^name.*$", Pattern.CASE_INSENSITIVE);
    //模糊匹配
Pattern pattern = Pattern.compile("^.*name8.*$", Pattern.CASE_INSENSITIVE);