MogoDB原生代码连接数据库

需要得依赖包
<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver</artifactId>
</dependency>

连接mongo数据库

public static void main(String[] args) {
    //连接mongo服务器
    MongoClient client=new MongoClient("127.0.0.1");
    //得到要操作的数据库
    MongoDatabase database = client.getDatabase("spitdb");
    //得到要操作得集合
    MongoCollection<Document> spit = database.getCollection("spit");
    //得到集合中所有得文档
    FindIterable<Document> documents = spit.find();
    //遍历数据
    for (Document document:documents) {
        System.out.println("内容："+document.getString("content"));
    }
   client.close();
}

查询

public static void main(String[] args) {
    //连接mongo服务器
    MongoClient client=new MongoClient("127.0.0.1");
    //得到要操作的数据库
    MongoDatabase database = client.getDatabase("spitdb");
    //得到要操作得集合
    MongoCollection<Document> spit = database.getCollection("spit");
    //封装查询条件
        //visits为10
        //BasicDBObject bson=new BasicDBObject("visits",10);
        //visits大于10
        BasicDBObject bson=new BasicDBObject("visits",new BasicDBObject("$gt",10));
    //得到集合中所有得文档
    FindIterable<Document> documents = spit.find(bson);
    //遍历数据
    for (Document document:documents) {
        System.out.println("内容："+document.getString("content"));
    }
   client.close();
}

添加
    public static void main(String[] args) {
        //连接mongo服务器
        MongoClient client=new MongoClient("127.0.0.1");
        //得到要操作的数据库
        MongoDatabase database = client.getDatabase("spitdb");
        //得到要操作得集合
        MongoCollection<Document> spit = database.getCollection("spit");
        //添加记录
        Map<String,Object> map=new HashMap<>();
        map.put("_id",1);
        map.put("comtemt","今天不冷不热");
        map.put("visits",13);
        Document document=new Document(map);
       spit.insertOne(document);
        client.close();
    }