java 操作 MongoDB 快速入手

发表于 2012-08-25 09:42:14 by 月小升

https://github.com/mongodb/mongo-java-driver/downloads

下载那个几百K的jar包即可 我下载的是mongo-2.9.0-RC2.jar 389K

下载以后，放到java工程里引入
接之前的测试

启动mongo。
然后写一个java程序

package com.javaer.mongo;

import java.net.UnknownHostException;
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 SimpleConnection {
	
	/**
	 * @param args
	 * @throws UnknownHostException 
	 */
	public static void main(String[] args) throws UnknownHostException {
		Mongo m = new Mongo();
		/**
		 * 其他连接方式
		 * Mongo m = new Mongo("localhost");
		 * Mongo m = new Mongo("localhost",27017);
		 * Mongo m = new Mongo(Arrays.asList(new ServerAddress("localhost", 27017), 
                                      new ServerAddress("localhost", 27018), 
                                      new ServerAddress("localhost", 27019)));
		 */
		DB db = m.getDB("yuexiaosheng");
		
		//列出所有connection
		Set colls = db.getCollectionNames();

		for (String s : colls) {
		    System.out.println("connection:" + s);
		}
		
		//读取一条数据
		DBCollection coll = db.getCollection("mycollection");
		DBObject myDoc = coll.findOne();
		System.out.println(myDoc);
		
		/**
		//插入一条数据
		BasicDBObject doc = new BasicDBObject();
		doc.put("title","tom is 2.8");
		doc.put("online","true");
		coll.insert(doc);
		*/
		
		//读取集合记录总数
		System.out.println(coll.getCount());
		
		//遍历集合记录
		DBCursor cursor = coll.find();
        try {
            while(cursor.hasNext()) {
                System.out.println(cursor.next());
            }
        } finally {
            cursor.close();
        }
        System.out.println("-----------------------------------------------------------------------");
        
        
        //搜索一个记录
        BasicDBObject query = new BasicDBObject();

        query.put("title", "tom is 2.8");
       
        cursor = coll.find(query);
        try {
            while(cursor.hasNext()) {
                System.out.println(cursor.next());
            }
        } finally {
            cursor.close();
        }
        
	}

}

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首发地址：月小升博客 – https://java-er.com/blog/java-mongodb/
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