Java操作MongoDB 3.x

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一. 添加依赖

<dependency>    <groupId>org.mongodb</groupId>    <artifactId>mongo-java-driver</artifactId>    <version>3.4.2</version></dependency>

二. 创建连接

private static MongoCollection<Document> collection = null;public static void main(String[] args){    try {        MongoClient client = new MongoClient("ip", 27017);        MongoDatabase mydb = client.getDatabase("mydb");        System.out.println("连接成功");        //新创建一个集合        //mydb.createCollection("userinfo");        //获取指定集合的连接        collection = mydb.getCollection("userinfo");    } catch (Exception e){        e.printStackTrace();    }}

三. 插入

    public void insert(){        Document document = new Document();        document.append("name", "Jack");        document.append("age", 20);        document.append("scholl", "Beida");        document.append("address", "guangzhou");        //插入数组        document.append("likes", new ArrayList<String>(Arrays.asList(new String[]{"basketball", "football"})));        //插入内嵌文档        Document innerDoc = new Document();        innerDoc.append("father", "Ben");        innerDoc.append("mother", "meihua");        document.append("parent", innerDoc);        //执行插入        collection.insertOne(document);    }

四. 查询

1. 查询一个

    /**     * 查询一个     */    public void findOne(){        //查询第一个文档        Document document = collection.find().first();        System.out.println(document.toJson());    }

2. 查询所有

/**     * 查询所有     */    public void findAll(){        MongoCursor<Document> cursor = collection.find().iterator();        while (cursor.hasNext()){            System.out.println(cursor.next().toJson());        }    }

3. 条件查询

    /**     * 条件查询,使用BasicDBObject     */    public void find(){        BasicDBObject object = new BasicDBObject();        object.put("name", "Jack");        Document doc = collection.find(object).first();        if(doc != null){            System.out.println(doc.toJson());        }    }

五、更新

    /**     * 更新文档     */    public void update(){        //查询要更新的doc        BasicDBObject object = new BasicDBObject();        object.put("age", 20);        //创建更新的doc        BasicDBObject newObj = new BasicDBObject();        newObj.put("age", 50);        //具体用什么操作更新        BasicDBObject update = new BasicDBObject("$set", newObj);        collection.updateOne(object, update);    }

六、删除

public void delete(){    BasicDBObject object = new BasicDBObject();    object.put("name", "Jack");    collection.deleteOne(object);}

官方3.0指导：http://mongodb.github.io/mongo-java-driver/3.3/driver/getting-started/quick-tour/
翻译：http://blog.csdn.net/qq_16313365/article/details/52335923
MongoDB Java-API：http://mongodb.github.io/mongo-java-driver/3.4/javadoc/
MongoDB入门：http://wiki.jikexueyuan.com/project/mongodb/mongodb-create-database.html

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