java Mongodb增删改查 java连接Mongodb实现增删改查

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

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) {
    //客户端链接
    MongoClient mongodbClint = new MongoClient("localhost", 27017);
    // 获取所有的数据库
    List<String> databaseNames = mongodbClint.getDatabaseNames();
    for (String databaseName : databaseNames) {
      System.out.println("数据库名称 "+databaseName);
    }
    // 连接指定的数据库
    DB db = mongodbClint.getDB("text");
 
    //获取当前数据库下的所有集合名称
    Set<String> collectionNames = db.getCollectionNames();
    for (String dbname : collectionNames) {
      System.out.println("集合名称 "+dbname);
    }
    // 连接指定的集合
    DBCollection collection = db.getCollection("stus");
     // 数据集合信息
    DBCursor dbObjects = collection.find();
 
    while (dbObjects.hasNext()){
      //读取数据
      DBObject next = dbObjects.next();
      // json 格式转换
      Stus parse = JSON.parseObject(next.toString(), Stus.class);
      // 数据输出
      System.out.println(parse);
    }
  }
}

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) {
    // 获取连接
    MongoClient mongodbClint = new MongoClient("localhost", 27017);
    // 连接数据库
    MongoDatabase database = mongodbClint.getDatabase("text");
    // 获取对象
    MongoCollection<Document> stus = database.getCollection("stus");
    Map<String, Object> map=new HashMap();
    map.put("name", "诸葛亮");
    map.put("sex", "男");
    map.put("age", 35.0);
    map.put("address", "南阳");
    Document document = new Document(map);
    System.out.println(document);
    stus.insertOne(document);
  }
}

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;
 
/**
 * 删除
 */
public class Delete {
  public static void main(String[] args) {
    //获取连接
    MongoClient location = new MongoClient("localhost", 27017);
    // 连接数据库
    MongoDatabase database = location.getDatabase("text");
    //获取集合封账对象
    MongoCollection<Document> collection = database.getCollection("stus");
    // 删除的条件
    BasicDBObject dbObject = new BasicDBObject("name", "诸葛亮");
    // 删除符合条件的第一个
     collection.deleteOne(dbObject);
     // 删除符合条件的所有
//     collection.deleteMany(new BasicDBObject("name","lisi"));
  }
}

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) {
    // 获取连接
    MongoClient mongoClient = new MongoClient();
    // 连接数据库
    MongoDatabase database = mongoClient.getDatabase("text");
    // 得到集合封装队象
    MongoCollection<Document> stuo = database.getCollection("stus");
    // 查询条件
     BasicDBObject upFind = new BasicDBObject("name", "wangwu");
    // 修改的值
    BasicDBObject upNew = new BasicDBObject("$set", new BasicDBObject("address", "高老庄"));
    // 修改符合条件的第一个值
    stuo.updateOne(upFind, upNew);
    //修改符合条件的全部
//    stuo.updateMany(upFind, upNew);
  }
}

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) {
    // 获取连接
    MongoClient mongoClient = new MongoClient();
    // 连接数据库
    MongoDatabase database = mongoClient.getDatabase("text");
    // 得到集合封装队象
    MongoCollection<Document> stus = database.getCollection("stus");
    // 查询条件
    BasicDBObject find = new BasicDBObject("name", "wangwu");
    // 得到查询结果
    FindIterable<Document> results = stus.find(find);
    // 集合遍历
    for (Document result : results) {
      // 格式转换
      String s = JSON.toJSONString(result);
      // 查询结果输出
      System.out.println(JSON.parseObject(s,Stus.class));
    }
  }
}