java操作mongo数据库的实例

MongoDB：Linux下的mongo安装包mongodb-linux-x86_64-3.0.3.tgz

Mongo接口：mongo-java-driver-3.0.3.jar

JSON解析：json.org.jar

 

实例代码：

 

package com.learn.test;

//导入json.org.jar中的类
import org.json.JSONException;
import org.json.JSONObject;

//导入mongo-java-driver-3.0.3.jar中的类
import org.bson.Document;
import com.mongodb.MongoClientURI;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.MongoCollection;


public class TestMongo
{
    public static void main(String[] args) throws JSONException
    {
        //建立与mongo数据库的连接
        MongoClientURI uri=new MongoClientURI("mongodb://10.200.156.7:27017");
        MongoClient client=new MongoClient (uri);

        //读取mongo库内所有的数据库名称
        MongoCursor<String> dbs=client.listDatabaseNames().iterator();
        System.out.println("mongodb中数据库有：");
        while(dbs.hasNext())
        {
            System.out.println(dbs.next());
        }

        //读取"hotwords"库中的"url"字段的值
        MongoDatabase db=client.getDatabase("hotwords");
        MongoCollection<Document> collection=db.getCollection("hot_config");
        MongoCursor<Document> cursor=collection.find().iterator();
        System.out.println("mongodb中的hot_config表结果如下：");
        while(cursor.hasNext())
        {
            JSONObject obj=new JSONObject(cursor.next());
            System.out.println("URL:"+obj.getString("url"));
        }

        //断开与mongo的连接
        client.close();
    }

}