java連接Mongodb進行增刪改查

1.創建maven項目

        <dependency>
            <groupId>org.mongodb</groupId>
            <artifactId>mongodb-driver</artifactId>
            <version>3.4.1</version>
        </dependency>

2.編寫代碼

 1.查詢所有

package com.czxy.mongodb;

import com.alibaba.fastjson.JSON;
import com.mongodb.*;

import java.util.List;
import java.util.Set;

public class Find {
    public static void main(String[] args) {
        //客戶端鏈接
        MongoClient mongodbClint = new MongoClient("localhost", 27017);
        // 獲取所有的數據庫
        List<String> databaseNames = mongodbClint.getDatabaseNames();
        for (String databaseName : databaseNames) {
            System.out.println("數據庫名稱  "+databaseName);
        }
        // 連接指定的數據庫
        DB db = mongodbClint.getDB("text");

        //獲取當前數據庫下的所有集合名稱
        Set<String> collectionNames = db.getCollectionNames();
        for (String dbname : collectionNames) {
            System.out.println("集合名稱  "+dbname);
        }
        // 連接指定的集合
        DBCollection collection = db.getCollection("stus");
         // 數據集合信息
        DBCursor dbObjects = collection.find();

        while (dbObjects.hasNext()){
            //讀取數據
            DBObject next = dbObjects.next();
            // json 格式轉換
            Stus parse = JSON.parseObject(next.toString(), Stus.class);
            // 數據輸出
            System.out.println(parse);
        }
    }
}

2.添加數據

package com.czxy.mongodb;

import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

import java.util.HashMap;
import java.util.Map;

public class Insert {
    public static void main(String[] args) {
        // 獲取連接
        MongoClient mongodbClint = new MongoClient("localhost", 27017);
        // 連接數據庫
        MongoDatabase database = mongodbClint.getDatabase("text");
        // 獲取對象
        MongoCollection<Document> stus = database.getCollection("stus");
        Map<String, Object> map=new HashMap();
        map.put("name", "諸葛亮");
        map.put("sex", "男");
        map.put("age", 35.0);
        map.put("address", "南陽");
        Document document = new Document(map);
        System.out.println(document);
        stus.insertOne(document);
    }
}

3.刪除

package com.czxy.mongodb;

import com.mongodb.BasicDBObject;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

/**
 *  刪除
 */
public class Delete {
    public static void main(String[] args) {
        //獲取連接
        MongoClient location = new MongoClient("localhost", 27017);
        // 連接數據庫
        MongoDatabase database = location.getDatabase("text");
        //獲取集合封賬對象
        MongoCollection<Document> collection = database.getCollection("stus");
        // 刪除的條件
        BasicDBObject dbObject = new BasicDBObject("name", "諸葛亮");
        // 刪除符合條件的第一個
          collection.deleteOne(dbObject);
          // 刪除符合條件的所有
//          collection.deleteMany(new BasicDBObject("name","lisi"));
    }
}

4.修改

package com.czxy.mongodb;

import com.mongodb.BasicDBObject;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

import java.awt.*;

public class Update {
    public static void main(String[] args) {
        // 獲取連接
        MongoClient mongoClient = new MongoClient();
        // 連接數據庫
        MongoDatabase database = mongoClient.getDatabase("text");
        // 得到集合封裝隊象
        MongoCollection<Document> stuo = database.getCollection("stus");
        // 查詢條件
         BasicDBObject upFind = new BasicDBObject("name", "wangwu");
        // 修改的值
        BasicDBObject upNew = new BasicDBObject("$set", new BasicDBObject("address", "高老莊"));
        // 修改符合條件的第一個值
        stuo.updateOne(upFind, upNew);
        //修改符合條件的全部
//        stuo.updateMany(upFind, upNew);
    }
}

5.條件查詢

package com.czxy.mongodb;

import com.alibaba.fastjson.JSON;
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;

public class FindEq {
    public static void main(String[] args) {
        // 獲取連接
        MongoClient mongoClient = new MongoClient();
        // 連接數據庫
        MongoDatabase database = mongoClient.getDatabase("text");
        // 得到集合封裝隊象
        MongoCollection<Document> stus = database.getCollection("stus");
        // 查詢條件
        BasicDBObject find = new BasicDBObject("name", "wangwu");
        // 得到查詢結果
        FindIterable<Document> results = stus.find(find);
        // 集合遍歷
        for (Document result : results) {
            // 格式轉換
            String s = JSON.toJSONString(result);
            // 查詢結果輸出
            System.out.println(JSON.parseObject(s,Stus.class));
        }
    }
}