java驱动操作MongoDB快速上手

1.导入maven依赖

    org.mongodb
    mongo-java-driver
    3.12.1

2.编写测试类

package com.diploma.person;

import com.mongodb.BasicDBObject;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;
import org.bson.conversions.Bson;
import org.junit.Before;
import org.junit.Test;

import java.util.HashMap;

public class JavaOptMongdbDB {
    MongoCollection<Document> collection;
    @Before
    public void init(){
        //连接mongoDB数据库
        MongoClient mongoClient = new MongoClient("49.235.227.178", 27017);
        //得到操作的数据库
        MongoDatabase database = mongoClient.getDatabase("test");
        //得到要操作的集合（类似于表）
        collection = database.getCollection("col");
    }
    /*添加一条记录记录
     * */
    @Test
    public void add(){
        HashMap<String, Object> map = new HashMap<>();
        map.put("uid","1060");
        map.put("name","大哈皮");
        map.put("content","大哈皮,哈哈哈哈哈");
        Document document = new Document(map);
        collection.insertOne(document);
    }
    /*删除记录
     * */
    @Test
    public void deleteAll(){
        Bson bson =new BasicDBObject() ;
        collection.deleteMany(bson);
    }
    /*查询所有记录
    * */
    @Test
    public void findAll(){
        FindIterable<Document> documents = collection.find();
        for (Document document : documents) {
            System.out.println("用户id："+document.getString("uid"));
            System.out.println("用户年龄："+document.getInteger("uage"));
            System.out.println("内容："+document.getString("content"));
        }
    }
    /*条件查询所有记录
    * */
    @Test
    public void findById(){
        //封装查询条件
//      1.  BasicDBObject bson = new BasicDBObject("uid", "1001");
        //查询uid大于1010的记录
        BasicDBObject bson = new BasicDBObject("uid", new BasicDBObject("$gt",1000));
        FindIterable<Document> documents = collection.find(bson);
        for (Document document : documents) {
            System.out.println("用户id："+document.getString("uid"));
            System.out.println("用户年龄："+document.getInteger("uage"));
            System.out.println("内容："+document.getString("content"));
        }
    }
    }