Mongo DB Java操作

1、首先下载Mongo DB java 驱动

 

2、操作Mongo 增删改查

package com.sjjy.mongo;

import java.util.ArrayList;
import java.util.List;

import org.bson.Document;

import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;

public class MongoTest {

public static void main(String[] args) {

try{

//连接到Mongo服务
MongoClient mongoClient = new MongoClient("localhost", 27017);
//连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("cf_sjjy_mongo");

System.out.println("Connect to database successfully");
mongoDatabase.createCollection("test");
System.out.println("集合创建成功");

MongoCollection<Document> collection = mongoDatabase.getCollection("test");
System.out.println("集合 test 选择成功");

//插入文档
/**
* 1. 创建文档 org.bson.Document 参数为key-value的格式
* 2. 创建文档集合List<Document>
* 3. 将文档集合插入数据库集合中 mongoCollection.insertMany(List<Document>) 插入单个文档可以用 mongoCollection.insertOne(Document)
* */
Document document = new Document("title", "MongoDB").
append("description", "database").
append("likes", 100).
append("by", "Fly");
List<Document> documents = new ArrayList<Document>();
documents.add(document);
collection.insertMany(documents);
System.out.println("文档插入成功");

//检索所有文档
/**
* 1. 获取迭代器FindIterable<Document>
* 2. 获取游标MongoCursor<Document>
* 3. 通过游标遍历检索出的文档集合
* */
FindIterable<Document> findIterable = collection.find();
MongoCursor<Document> mongoCursor = findIterable.iterator();
while(mongoCursor.hasNext()){
//获取文档对象
System.out.println(mongoCursor.next());
//获取文档对象里面的一个属性值
System.out.println(mongoCursor.next().get("likes"));
}


//更新文档 将文档中likes=100的文档修改为likes=200
collection.updateMany(Filters.eq("likes", 100), new Document("$set",new Document("likes",200)));
//检索查看结果
 FindIterable<Document> findIterable = collection.find();
MongoCursor<Document> mongoCursor = findIterable.iterator();
while(mongoCursor.hasNext()){
System.out.println(mongoCursor.next());
} 


//删除符合条件的第一个文档
collection.deleteOne(Filters.eq("likes", 100));
//删除所有符合条件的文档
collection.deleteMany (Filters.eq("likes", 200));
//检索查看结果
FindIterable<Document> findIterable = collection.find();
MongoCursor<Document> mongoCursor = findIterable.iterator();
while(mongoCursor.hasNext()){
System.out.println(mongoCursor.next() + " wenhy");
}


}catch (Exception e) {

System.out.println(e.getClass().getName() + " : " + e.getMessage());

}
}

}

 

更多操作可以参考：http://mongodb.github.io/mongo-java-driver/3.0/driver/getting-started/quick-tour/