Java 连接 操作Mongodb 添加查询

import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.Mongo;


public class MongoTest {

	private static String dbIp = "localhost";
	private static int dbPort = 27017;
	private static String dbUser = "user1";
	
	public static void main(String[] args) {
		MongoTest mongo = new MongoTest();
		DBCollection collection;
		try {
			//获取连接
			collection = mongo.getCollection();  
			//插入数据
			mongo.insertDate(collection);
			//查询数据
			mongo.queryDate(collection);
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
	}
	
	public DBCollection getCollection () throws UnknownHostException{
		//实例化Mongo对象，
        Mongo mongo = new Mongo(dbIp, dbPort);
        //连接名为yourdb的数据库，假如数据库不存在的话，mongodb会自动建立
        DB db = mongo.getDB(dbUser);
        //从Mongodb中获得名为myData的数据集合，如果该数据集合不存在，Mongodb会为其新建立
        DBCollection collection = db.getCollection("myData");
        return collection;
	}
	
	public void insertDate(DBCollection collection){
		 // 创建要保存的document
		BasicDBObject document = new BasicDBObject();
		List<DBObject> documents = new ArrayList<DBObject>();
        document.put("id", 1113);
        document.put("msg", "mongodb test1 花生酱");
        document.put("msg2", "mongodb test1 花生酱");
        document.put("msg3", "mongodb test1 花生酱");
        documents.add(document);
        document = new BasicDBObject();
        document.put("id", 1114);
        document.put("msg4", "mongodb test2 暗世界");
        document.put("msg5", "mongodb test2 暗世界");
        documents.add(document);
        //将新建立的document保存到collection中去
        collection.insert(document); //单条插入
        collection.insert(documents);  //多条集合插入
	}
	
	public void queryDate(DBCollection collection){
		 // 创建要查询的document
        BasicDBObject searchQuery = new BasicDBObject();
        searchQuery.put("id", 1113);
        // 使用collection的find方法查找document
        DBCursor cursor = collection.find(searchQuery);
        //循环输出结果
        while (cursor.hasNext()) {
        	System.out.println(cursor.next());
        }
        searchQuery.put("id", 1114);
        cursor = collection.find(searchQuery);
        while (cursor.hasNext()) {
        	System.out.println(cursor.next());
        }
	}
}