Mongodb 3.2 Java 显示指定字段 条件查询 分页排序

package com.tesco.mongodb.test;


import java.util.List;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;


import org.bson.Document;



import com.mongodb.AggregationOutput;
import com.mongodb.BasicDBObject;

import com.mongodb.MongoClient;
import com.mongodb.client.AggregateIterable;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;


public class Test1 {
 
	public static void main(String[] args) {
		Logger log = Logger.getLogger("org.mongodb.driver");
		log.setLevel(Level.OFF);
		MongoClient mongoClient  = null;
		MongoCursor mongoCursor = null;
		try {
			Long l1 = System.currentTimeMillis();
			
			mongoClient = new MongoClient("xxx.xxx.xxx.xxx", 27017);
			// create db
			// MongoDatabase mongoDatabase = mongoClient.getDatabase("testdb");
			// mongoDatabase.createCollection("testcol");
			MongoDatabase mongoDatabase = mongoClient.getDatabase("testdb");
			MongoCollection collection = mongoDatabase
					.getCollection("testcol");
			
			// create document
			// Document document = new Document("title", "MongoDB").
			// append("description", "database2").
			// append("likes", 100).
			// append("by", "Fly2");
			// List documents = new ArrayList();
			// documents.add(document);
			// collection.insertMany(documents);
			
			// update document
			// collection.updateMany(Filters.eq("likes", 100), new
			// Document("$set",new Document("likes",200)));

			// delete document
			// collection.deleteMany(Filters.eq("likes", 200));
			
			//display fields
			BasicDBObject fields = new BasicDBObject();
			fields.put("_id", 0);
//			fields.put("title",1);
//			fields.put("description", 1);
//			fields.put("likes", 1);
//			fields.put("by", 1);
			//query 
			BasicDBObject query = new BasicDBObject();
//			query.put("description", "database2");
			query.put("likes", new BasicDBObject("$gt", 0));
			//sort
			BasicDBObject sort = new BasicDBObject();
//			sort.put("by", -1);
			sort.put("likes", 1);
//			sort.put("by", 1);
			
//			System.out.println(collection.count());
			FindIterable findIterable = collection.find(query).sort(sort)
                                                              .projection(fields)
                                                              .skip((20000-1)*10).limit(10);
	 
			mongoCursor = findIterable.iterator();
			while (mongoCursor.hasNext()) {
//				System.out.println(mongoCursor.next());
				Document d = mongoCursor.next();
//				JSONObject jsonobj = new JSONObject(d.toJson());
				System.out.println(d.toJson());
//				String description =  (String) jsonobj.get("by");
//				System.out.println(description);
			}
			
			
//			BasicDBObject match1 = new BasicDBObject();
//			BasicDBObject match2 = new BasicDBObject();
//			List list_query_in = new ArrayList();
//			list_query_in.add("database1");
//			list_query_in.add("database2");
//			match2.put("$in", list_query_in);
//			match1.put("description", match2);
//			BasicDBObject match = new BasicDBObject("$match", match1 );
//
//
//			BasicDBObject p_fields = new BasicDBObject();
//			p_fields.put("_id", 0);
//			p_fields.put("description", 1);
//			p_fields.put("likes", 1);
//			BasicDBObject project = new BasicDBObject("$project", p_fields ); 
//			
//			BasicDBObject groupFields = new BasicDBObject("_id", "$description");
////			BasicDBObject groupFields = new BasicDBObject("_id", null);
////			groupFields.put("average", new BasicDBObject( "$avg", "$likes"));	//102.5
//			groupFields.put("total", new BasicDBObject( "$sum", "$likes")); //410
////			groupFields.put("count", new BasicDBObject( "$sum", 1)); // 4
//			BasicDBObject group = new BasicDBObject("$group", groupFields);
//			
//			BasicDBObject sort1Fields = new BasicDBObject("total", -1);
//			BasicDBObject sort1 = new BasicDBObject("$sort", sort1Fields);
//			
//			List list = new ArrayList();
////			list.add(match);
//			list.add(project);
//			list.add(group);
//			list.add(sort1);
//			
//			//aggregate
//			AggregateIterable output =   collection.aggregate(list);
//			MongoCursor mongoCursor1 = output.iterator();
//			while (mongoCursor1.hasNext()) {
//				Document d = mongoCursor1.next();
//				System.out.println(d.toJson());
//			}
			
			Long l2 = System.currentTimeMillis();
			System.out.println(l2-l1);

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			
			if(null != mongoCursor)
				mongoCursor.close();
			if(null != mongoClient)
				mongoClient.close();
			
		}

	}

}

官方链接：http://mongodb.github.io/mongo-java-driver/3.4/driver/tutorials/perform-read-operations/

package com.tesco.mongodb.test;



import java.util.Date;
import java.util.List;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;


import org.bson.Document;
//import org.json.JSONObject;



import com.mongodb.AggregationOutput;
import com.mongodb.BasicDBObject;
import com.mongodb.Block;
import com.mongodb.DBCursor;
import com.mongodb.MongoClientURI;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.WriteConcern;

import com.mongodb.MongoClient;
import static com.mongodb.client.model.Filters.*;
import static com.mongodb.client.model.Projections.*;
import com.mongodb.client.AggregateIterable;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;
import com.mongodb.client.model.Sorts;


public class Test4 {
 
	public static void main(String[] args) {
		
		
		for (int i = 0; i < 3; i++) {
			run1();	
		}
		
	}
	
	
	private static void run1(){
		Logger log = Logger.getLogger("org.mongodb.driver");
		log.setLevel(Level.OFF);
		MongoClient mongoClient  = null;
		MongoCursor mongoCursor = null;
		
		Block printBlock = new Block() {
		       @Override
		       public void apply(final Document document) {
		           System.out.println(document.toJson());
		       }
		};
		
		
		try {
			Long l1 = System.currentTimeMillis();
			/*
			 * MongoClientURI connectionString = new MongoClientURI("
			 * mongodb://root:****@dds-bp114e3f1fc441342.mongodb.rds.aliyuncs.com:3717,
			 * dds-bp114e3f1fc441341.mongodb.rds.aliyuncs.com:3717/admin?replicaSet=mgset-677201"); // ****替换为root密码
MongoClient client = new MongoClient(connectionString);
			 * */

//			MongoClientURI connectionString = new MongoClientURI("mongodb://myRootAdmin:xxx@" +
//			MongoClientURI connectionString = new MongoClientURI("mongodb://myTester:xxx@" +
//			MongoClientURI connectionString = new MongoClientURI("mongodb://myUserAdmin:xxx@" +
			MongoClientURI connectionString = new MongoClientURI("mongodb://" +
					"mongodb0.example.net:26001," +
					"mongodb1.example.net:26002," +
					"mongodb2.example.net:26003/admin?replicaSet=rs0&maxPoolSize=400");//&readPreference=secondary
			//&readPreference=nearest
			//mongodb://host:27017/?replicaSet=rs0&maxPoolSize=200
//			mongoClient = new MongoClient("10.254.45.223", 27017);
//			mongoClient = new MongoClient("10.254.45.223", 26001);
			
			mongoClient = new MongoClient(connectionString);
//			mongoClient = MongoDBPoolUtil.pollConnection();
//			mongoClient.setReadPreference(ReadPreference.secondary());
//			ReadPreference.nearest();
//			ReadPreference.primary();
//			ReadPreference.primaryPreferred();
//			ReadPreference.secondary();
//			ReadPreference.secondaryPreferred();
//			System.out.println(mongoClient.getReadPreference());
			
			// create db
//			 MongoDatabase mongoDatabase = mongoClient.getDatabase("testdb");
//			 mongoDatabase.createCollection("testcol1");
			// get db
			MongoDatabase mongoDatabase = mongoClient.getDatabase("test");
//			MongoDatabase mongoDatabase = mongoClient.getDatabase("local");//.withReadPreference(ReadPreference.secondary())
//			System.out.println(mongoDatabase.getReadPreference());
			
			
//			mongoDatabase.withReadPreference(ReadPreference.secondary());
//			mongoDatabase.withWriteConcern(WriteConcern.MAJORITY);
//			mongoDatabase.withReadConcern(ReadConcern.MAJORITY); 
//			ReadPreference preference = ReadPreference.secondaryPreferred();
//			MongoCollection collection = mongoDatabase.getCollection("startup_log");
			MongoCollection collection = mongoDatabase.getCollection("testcol123");
//			MongoCollection collection = mongoDatabase.getCollection("foo");
//																.withReadPreference(ReadPreference.secondary());
//			ReadPreference preference = ReadPreference.primaryPreferred();
//			System.out.println(collection.getReadPreference());
//			DBCursor cur = new DBCursor(collection, null, null, preference);
			
//			collection.withReadPreference(ReadPreference.secondary());
//			collection.withWriteConcern(WriteConcern.MAJORITY);
//			collection.drop();
			 //create document
//			List documents = new ArrayList();
//			for (int i = 0; i < 1; i++) {
//				 Document document = new Document("title", "MongoDB").
//				 append("description", "database2").
//				 append("likes", i).
//				 append("by", "Fly"+String.valueOf(i)).
//				 append("long1", Long.valueOf(i)).
//				 append("decimal", new Double("1.9886443895687")).
//				 append("date1", new Date());
//				 documents.add(document);
//			}
//			collection.insertMany(documents);
			
//			System.out.println(System.currentTimeMillis());
//			System.out.println(System.nanoTime());
			
//			collection.find(eq("a1", 222))
			collection.find()
			.projection(fields(include("a1", "a2"), excludeId()))
			.sort(Sorts.descending("a2"))
//			.skip(2).limit(4)
			.forEach(printBlock);
			
//			FindIterable findIterable = collection.find();
//			mongoCursor = findIterable.iterator();
//			System.out.println(mongoCursor.hasNext());
//			while (mongoCursor.hasNext()) {
//				mongoCursor.next();
//				System.out.println(mongoCursor.next());
//				Document d = mongoCursor.next();
//				System.out.println(d.toJson());
//				JSONObject jsonobj = new JSONObject(d.toJson());
//				Long d1 =   (Long) jsonobj.getJSONObject("date1").get("$date");
//				System.out.println(new Date(d1));
//			}
			
			 //update document
			//collection.updateMany(Filters.eq("likes", 5), new Document("$unset",new Document("long2",null)));
//
//			 delete document
			
			 //collection.deleteMany(Filters.eq("likes", 5)));
//			
//			//display fields
//			BasicDBObject fields = new BasicDBObject();
//			fields.put("_id", 0);
////			fields.put("title",1);
////			fields.put("description", 1);
////			fields.put("likes", 1);
////			fields.put("by", 1);
//			//query 
//			BasicDBObject query = new BasicDBObject();
////			query.put("description", "database2");
////			query.put("likes", new BasicDBObject("$lt", 104));
//			//sort
//			BasicDBObject sort = new BasicDBObject();
//			sort.put("by", -1);
//			sort.put("likes", -1);
////			sort.put("by", 1);
//			
////			System.out.println(collection.count());
//			FindIterable findIterable = collection.find(query).sort(sort).projection(fields).skip(0).limit(20);
//			MongoCursor mongoCursor = findIterable.iterator();
//			while (mongoCursor.hasNext()) {
////				System.out.println(mongoCursor.next());
//				Document d = mongoCursor.next();
////				JSONObject jsonobj = new JSONObject(d.toJson());
//				System.out.println(d.toJson());
////				String description =  (String) jsonobj.get("by");
////				System.out.println(description);
//			}
//			
//			BasicDBObject match1 = new BasicDBObject();
//			BasicDBObject match2 = new BasicDBObject();
//			List list_query_in = new ArrayList();
//			list_query_in.add("database1");
//			list_query_in.add("database2");
//			match2.put("$in", list_query_in);
//			match1.put("description", match2);
//			BasicDBObject match = new BasicDBObject("$match", match1 );
//
//			BasicDBObject p_fields = new BasicDBObject();
//			p_fields.put("_id", 0);
//			p_fields.put("description", 1);
//			p_fields.put("likes", 1);
//			BasicDBObject project = new BasicDBObject("$project", p_fields ); 
//			
//			BasicDBObject groupFields = new BasicDBObject("_id", "$description");
////			BasicDBObject groupFields = new BasicDBObject("_id", null);
////			groupFields.put("average", new BasicDBObject( "$avg", "$likes"));	//102.5
//			groupFields.put("total", new BasicDBObject( "$sum", "$likes")); //410
////			groupFields.put("count", new BasicDBObject( "$sum", 1)); // 4
//			BasicDBObject group = new BasicDBObject("$group", groupFields);
//			
//			BasicDBObject sort1Fields = new BasicDBObject("total", -1);
//			BasicDBObject sort1 = new BasicDBObject("$sort", sort1Fields);
//			
//			List list = new ArrayList();
//			list.add(match);
//			list.add(project);
//			list.add(group);
//			list.add(sort1);
//			
//			List list = new ArrayList();
//			BasicDBObject _lookup = new BasicDBObject();
//			_lookup.put("from", "inventory");
//			_lookup.put("localField", "item");
//			_lookup.put("foreignField", "sku");
//			_lookup.put("as", "inventory_docs");
//			
//			BasicDBObject _lookup1 = new BasicDBObject();
//			_lookup1.put("$lookup", _lookup);
//			
//			list.add(_lookup1);
//			//aggregate
//			AggregateIterable output =   collection.aggregate(list);
//			mongoCursor = output.iterator();
//			while (mongoCursor.hasNext()) {
//				Document d = mongoCursor.next();
//				System.out.println(d.toJson());
//			}
//			
			
			
			
			
			Long l2 = System.currentTimeMillis();
			System.out.println(l2-l1);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if(null != mongoCursor)
				mongoCursor.close();
			if(null != mongoClient){
				mongoClient.close();
//				MongoDBPoolUtil.closeConnection(mongoClient);
			}
		}

	}

}