maven:

<dependency>
            <groupId>org.mongodb</groupId>
            <artifactId>mongo-java-driver</artifactId>
            <version>3.4.2</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-mongodb</artifactId>
            <version>1.9.5.RELEASE</version>
        </dependency>```

spring-mongodb.xml

<mongo:mongo host="${mongo.host}" port="${mongo.port}">
<mongo:options
connections-per-host="${mongo.connectionsPerHost}"
threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"
connect-timeout="${mongo.connectTimeout}"
max-wait-time="${mongo.maxWaitTime}"
auto-connect-retry="${mongo.autoConnectRetry}"
socket-keep-alive="${mongo.socketKeepAlive}"
socket-timeout="${mongo.socketTimeout}"
slave-ok="${mongo.slaveOk}"
write-number="1"
write-timeout="0"
write-fsync="true" />
</mongo:mongo>

<!-- mongo数据库连接名称 -->
<mongo:db-factory dbname="${mongo.db.name}" mongo-ref="mongo" username="${mongo.userName}" password="${mongo.password}"/>

<!-- mongo数据库操作模板 -->
<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
    <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
</bean>

<!-- MongoDB Dao层Bean配置 -->
<bean id="mongodbDao" class="com.alsfox.dao.mongodb.MongodbDao">
    <property name="collectionName" value="${mongodb.collection.name}"/>
    <property name="mongoTemplate" ref="mongoTemplate"/>
</bean>```

MongodbDao.java

package com.alsfox.dao.mongodb;

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

import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Direction;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;

import com.alsfox.entity.DeviceState;
import com.mongodb.BasicDBObject;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;

public class MongodbDao {

    // Mongo集合名称
    private String collectionName;

    // Mongo操作模板
    private MongoTemplate mongoTemplate;

    public void setCollectionName(String collectionName) {
        this.collectionName = collectionName;
    }

    public void setMongoTemplate(MongoTemplate mongoTemplate) {
        this.mongoTemplate = mongoTemplate;
    }

    /**
     * 批量插入mongodb
     *
     * @param deviceStateList
     */
    public void insertDeviceBeatStates(List<DeviceState> deviceStateList) {
        List<DBObject> dbObjectList = new ArrayList<DBObject>();
        for (int i = 0; i < deviceStateList.size(); i++) {
            DBObject dbObject = new BasicDBObject();
            dbObject.put("frameNo", deviceStateList.get(i).getFrameNo());
            dbObject.put("motorcar_state", deviceStateList.get(i).getMotorcar_state());
            dbObject.put("security_state", deviceStateList.get(i).getSecurity_state());
            dbObject.put("device_speed", deviceStateList.get(i).getDevice_speed());
            dbObject.put("battery_voltage", deviceStateList.get(i).getBattery_voltage());
            dbObject.put("battery_power", deviceStateList.get(i).getBattery_power());
            dbObject.put("motor_temperature", deviceStateList.get(i).getMotor_temperature());
            dbObject.put("control_temperature", deviceStateList.get(i).getControl_temperature());
            dbObject.put("battery_temperature", deviceStateList.get(i).getBattery_temperature());
            dbObject.put("stall", deviceStateList.get(i).getStall());
            dbObject.put("accelerate_num", deviceStateList.get(i).getAccelerate_num());
            dbObject.put("deceleration_num", deviceStateList.get(i).getDeceleration_num());
            dbObject.put("lon_flag", deviceStateList.get(i).getLon_flag());
            dbObject.put("lon_int", deviceStateList.get(i).getLon_int());
            dbObject.put("lon_float", deviceStateList.get(i).getLon_float());
            dbObject.put("lat_flag", deviceStateList.get(i).getLat_flag());
            dbObject.put("lat_int", deviceStateList.get(i).getLat_int());
            dbObject.put("lat_float", deviceStateList.get(i).getLat_float());
            dbObject.put("mileage", deviceStateList.get(i).getMileage());
            dbObject.put("createTime", deviceStateList.get(i).getCreateTime());

            dbObjectList.add(dbObject);
        }

        DBCollection dbCollection = mongoTemplate.getCollection(collectionName);
        dbCollection.insert(dbObjectList);
    }

    /**
     * 根据车架号查询倒数第二条数据
     *
     * @param carFrameNo
     * @return
     */
    public DeviceState selectLastFrameState(String carFrameNo) {
        Query query = new Query();
        Criteria criteria = new Criteria();
        criteria.andOperator(Criteria.where("frameNo").is(carFrameNo));
        query.addCriteria(criteria);
        query.with(new Sort(Direction.DESC, "createTime"));
        query.skip(1);
        query.limit(1);
        List<DeviceState> state = mongoTemplate.find(query, DeviceState.class, collectionName);
        if (state != null && state.size() > 0) {
            return state.get(0);
        } else {
            return null;
        }
    }

    /**
     * 根据车架号查询上一次位置信息
     *
     * @param carFrameNo
     * @return
     */
    public DeviceState selectLastLocationState(String carFrameNo) {
        Query query = new Query();
        Criteria criteria = new Criteria();
        criteria.andOperator(Criteria.where("frameNo").is(carFrameNo));
        query.addCriteria(criteria);
        //按时间倒序排列
        query.with(new Sort(Direction.DESC, "createTime"));
        query.limit(100);
        List<DeviceState> state = mongoTemplate.find(query, DeviceState.class, collectionName);
        if (state != null && state.size() > 0) {
            //遍历结果集
            for (DeviceState d : state) {
                //判断是否有位置信息
                if (d.getLon_int()[0] != 0) {
                    //有则返回
                    return d;
                }
            }
        }
        return null;
    }


}