原生mongo包编程

maven:

 
            org.mongodb
            mongo-java-driver
            3.4.2
        
        
            com.google.code.gson
            gson
            2.8.0
        ```


MongoTest1.java

import com.google.gson.Gson;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;
import java.util.ArrayList;
import java.util.List;
import static com.mongodb.client.model.Sorts.descending;
import static com.mongodb.client.model.Sorts.orderBy;

public class MongoTest1 {
public static void main(String[] args) {
try{
//获得连接(无需验证用户名密码)
MongoClient mongoClient=new MongoClient("localhost",27017);

        //连接数据库
        MongoDatabase mongoDatabase=mongoClient.getDatabase("5");
        System.out.println("Connect to database successfully");

        //创建集合
        //mongoDatabase.createCollection("testCollection");
        //System.out.println("集合创建成功");

        //获取集合，打印文档
        MongoCollection collection=mongoDatabase.getCollection("6");
        System.out.println("集合 testCollection 选择成功");

        //插入文挡
        /*Document document=new Document();
        document.append("name","cc")
                .append("age", 24)
                .append("job","battery");
        List documents=new ArrayList();
        documents.add(document);
        collection.insertMany(documents);
        System.out.println("文档插入成功");*/

        //检索所有文档
        /*FindIterable findIterable=collection.find();
        MongoCursor mongoCursor=findIterable.iterator();
        while (mongoCursor.hasNext()){
            System.out.println(mongoCursor.next());
        }*/

        //更新文档   将文档中age=18的文档修改为age=24
        /*collection.updateMany(Filters.eq("age", 18), new Document("$set",new Document("age",24)));
        FindIterable findIterable=collection.find();
        MongoCursor 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("age", 24));

        //删除所有符合条件的文档
        //collection.deleteMany(Filters.eq("age", 24));


        //Document document=new Document();
        //以time排序获得最后一条记录
        /*document=collection.find().sort(orderBy(descending("time"))).first();
        String documentStr=document.toJson();
        MongoResult mongoResult=new Gson().fromJson(documentStr, MongoResult.class);*/

        //分页
        int pageNo=1;
        int pageSize=3;

        List list=new ArrayList();
        MongoCursor cursor=collection.find().sort(orderBy(descending("time"))).skip((pageNo - 1) * pageSize).limit(pageSize).iterator();

        try {
            while (cursor.hasNext()) {
                String docStr=cursor.next().toJson();
                MongoResult mongoResult=new Gson().fromJson(docStr,MongoResult.class);
                System.out.println(mongoResult.getResult());
                list.add(mongoResult);
            }
        } finally {
            cursor.close();
        }

    }catch (Exception e){
        System.out.println("出现异常");
    }
}

}

MongoResult.java:

/**

• Created by ztc on 2017/3/30.
  */
  public class MongoResult {
  private String result;
  private String time;

  public String getResult() {
  return result;
  }

  public void setResult(String result) {
  this.result = result;
  }

  public String getTime() {
  return time;
  }

  public void setTime(String time) {
  this.time = time;
  }
  }