mongoDB在windows下的安装

（1）下载mongoDb包，在mongodb官网上很容易找到，下载地址，然后删去多余的东西，只保留bin文件夹，在bin文件夹同级的目录下面建立data文件夹，和log文件夹，log文件夹下建立mongo.log文件。

（2）管理员身份打开cmd cd到mongo的bin目录下，例子如下

c:\Program Files\MongoDB\bin>mongod --dbpath "c:\program files\mongodb\data" --logpath "c:\program files\mongodb\log\mongo.log" --install --serviceName "mongodb"

（3）mongodb的基本语法参照菜鸟教程

（3）java 中操作mongodb，curd 操作下载版本对应的jar包，否则报错

代码如下：

package cn.mongo.jdbc;

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

import javax.swing.text.DefaultEditorKit.InsertBreakAction;

import org.bson.Document;

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

public class mongoDBJDBC {
public static void main(String[] args) {
   try{

   MongoClient mongoClient=new MongoClient("127.0.0.1" , 27017);
   //获取集合
           MongoDatabase mongoDatabase=mongoClient.getDatabase("maydb");
           MongoCollection<Document> collection=mongoDatabase.getCollection("loction");
    System.out.println("数据库连接成功");
insert(mongoDatabase,collection);
    findIterable( mongoDatabase, collection);
    updata(collection);
    delete(collection);
   //collection.deleteOne(Filters.eq("likes",200));
   //删除所有符合条件的文档

}
   catch (Exception e){
       System.out.println("书库链接失败");
       }
   }

//插入数据
public static int insert(MongoDatabase mongoDatebase,MongoCollection<Document> collection){

   System.out.println("集合选择成功！");

   Document document=new Document("title","mongoDB");
   document.append("description", "database");
       document.append("likes", 100);
       document.append("by", "fly");
       List<Document> documents =new ArrayList<Document>();
       documents.add(document);
   collection.insertMany(documents);
   System.out.println("插入成功！");
   return 1;

}
//检索文档
//获取迭代器findIterable<document>
//获取游标 mongoCursor<Document>
//通过游标便利检索出文档集和

public static int findIterable(MongoDatabase mongoDatabase,MongoCollection<Document> collection){
   FindIterable<Document>findIterable=collection.find();
   MongoCursor<Document>mongoCursor=findIterable.iterator();
   while(mongoCursor.hasNext()){
       System.out.println(mongoCursor.next());

   }
   System.out.println("检索完毕1");

return 1;
}
/*更新文档
* updataMany();
*/
public static void updata(MongoCollection<Document> collection){
   collection.updateMany(Filters.eq("likes", 100), new Document("$set",new Document("likes",200)));
   //检索结果
   FindIterable<Document> findIterable=collection.find();
   MongoCursor<Document> mongocursor=findIterable.iterator();
   while(mongocursor.hasNext()){
       System.out.println(mongocursor.next());


   }
   System.out.println("检索完毕2");

   //删除remove（）

}
public static void delete(MongoCollection<Document> collection){
   //删除第一个文档

   //collection.deleteOne(Filters.eq("likes",200));
   //删除所有符合条件的文档
   collection.deleteMany(Filters.eq("likes",200));
   FindIterable<Document> findIterable=collection.find();
   MongoCursor<Document> mongocursor=findIterable.iterator();
   while(mongocursor.hasNext()){
       System.out.println(mongocursor.next());


   }

      System.out.println("删除成功！");
}

}