Java连接mongodb

首先添加mongodb的驱动包

并开启了mongodb的服务

package com.zzq.test;

import java.net.UnknownHostException;

import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.Mongo;
import com.mongodb.MongoException;
import com.mongodb.util.JSON;

public class MongDBTest {
public static void main(String[] args) throws UnknownHostException, MongoException {

Mongo mg = new Mongo("localhost", 27017);
//查询所有的Database
for (String name : mg.getDatabaseNames()) {
System.out.println("dbName: " + name);
}

DB db = mg.getDB("mircroblog");
//查询所有的聚集集合
for (String name : db.getCollectionNames()) {
System.out.println("collectionName: " + name);
}

DBCollection users = db.getCollection("citizens");

//查询所有的数据
DBCursor cur = users.find();
while (cur.hasNext()) {
System.out.println(cur.next());
}
System.out.println(cur.count());
System.out.println(cur.getCursorId());
System.out.println(JSON.serialize(cur));

}

}