Mongodb整合Maven，Spring项目参考

最近后台需要写mongodb与spring项目的整合接口，参阅了网上资料后自己写出了几个方法来分享参考

一：maven引用

<!-- https://mvnrepository.com/artifact/org.mongodb/mongo-java-driver --><dependency><groupId>org.mongodb</groupId><artifactId>mongo-java-driver</artifactId><version>3.2.2</version></dependency>

3.2版本以上的都可以，按照个人喜好就行

二：连接mongo配置

package com.suncar.core.util;import com.mongodb.MongoClient;import com.mongodb.client.MongoDatabase;public class MongoHelper { static final String DBName = "abc";     static final String ServerAddress = "127.0.0.1";      static final int PORT = 27017;     public MongoHelper(){     }     public MongoClient getMongoClient( ){         MongoClient mongoClient = null;         try {               // 连接到 mongodb 服务             mongoClient = new MongoClient(ServerAddress, PORT);              System.out.println("Connect to mongodb successfully");         } catch (Exception e) {             System.err.println(e.getClass().getName() + ": " + e.getMessage());         }         return mongoClient;     }     public MongoDatabase getMongoDataBase(MongoClient mongoClient) {           MongoDatabase mongoDataBase = null;         try {               if (mongoClient != null) {                     // 连接到数据库                 mongoDataBase = mongoClient.getDatabase(DBName);                   System.out.println("Connect to DataBase successfully");             } else {                   throw new RuntimeException("MongoClient不能够为空");               }           } catch (Exception e) {               e.printStackTrace();           }         return mongoDataBase;     }       public void closeMongoClient(MongoDatabase mongoDataBase,MongoClient mongoClient ) {           if (mongoDataBase != null) {               mongoDataBase = null;           }           if (mongoClient != null) {               mongoClient.close();           }           System.out.println("CloseMongoClient successfully");       }  }

连接服务器地址与数据库都可以定义到config配置里，因项目没有需求暂时不用考虑

三：Dao层编写

package com.suncar.core.dao;import java.util.ArrayList;import java.util.List;import java.util.Map;import org.bson.Document;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Repository;import com.mongodb.BasicDBObject;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.result.DeleteResult;import com.mongodb.client.result.UpdateResult;import com.mongodb.util.JSON;import com.suncar.core.util.MongoHelper;@Repositorypublic class MongoDbDao {MongoHelper mongoHelper = new MongoHelper();MongoClient mongoClient = mongoHelper.getMongoClient();MongoDatabase mongoDataBase = mongoHelper.getMongoDataBase(mongoClient);public static final Logger logger = LoggerFactory.getLogger(MongoDbDao.class);public Map<String, Integer> queryByID(String table,Object Id) throws Exception {MongoCollection<Document> collection = mongoDataBase.getCollection(table);BasicDBObject query = new BasicDBObject("_id", Id);// DBObject接口和BasicDBObject对象：表示一个具体的记录，BasicDBObject实现了DBObject，是key-value的数据结构，用起来和HashMap是基本一致的。FindIterable<Document> iterable = collection.find(query);Map<String, Integer> jsonStrToMap = null;MongoCursor<Document> cursor = iterable.iterator();while (cursor.hasNext()) {Document user = cursor.next();String jsonString = user.toJson();jsonStrToMap = jsonStrToMap(jsonString);// 这里用到我自己写的方法,主要是包json字符串转换成map格式,为后面做准备,方法放在后面}System.out.println("检索ID完毕");return jsonStrToMap;}    /**     * 根据一个doc，来检索，当doc是空的时候检索全部     * @param db     * @param table     * @param doc     */    public List<Map<String,Integer>>  queryByDoc(String table, BasicDBObject doc) {        MongoCollection<Document> collection = mongoDataBase.getCollection(table);        FindIterable<Document> iterable = collection.find(doc);         /**          * 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          * */          List<Map<String,Integer>> list = new ArrayList<Map<String,Integer>>();        MongoCursor<Document> cursor = iterable.iterator();        while (cursor.hasNext()) {            Document user = cursor.next();            String jsonString = user.toJson();            Map<String, Integer> jsonStrToMap = jsonStrToMap(jsonString);            list.add(jsonStrToMap);        }        System.out.println("检索doc完毕");        return list;    }    /**     *  检索全部并返回迭代器     * @param db     * @param table     */    public List<Map<String,Integer>> queryAll(String table) {        MongoCollection<Document> collection = mongoDataBase.getCollection(table);        FindIterable<Document> iterable = collection.find();        List<Map<String,Integer>> list = new ArrayList<Map<String,Integer>>();        MongoCursor<Document> cursor = iterable.iterator();        while (cursor.hasNext()) {            Document user = cursor.next();            String jsonString = user.toJson();            Map<String, Integer> jsonStrToMap = jsonStrToMap(jsonString);            list.add(jsonStrToMap);        }        System.out.println("检索全部完毕");        return list;    }    /**     * 便利迭代器FindIterable<Document>      */    public void printFindIterable(FindIterable<Document> iterable){        MongoCursor<Document> cursor = iterable.iterator();        while (cursor.hasNext()) {            Document user = cursor.next();            System.out.println(user.toJson());        }        cursor.close();    }    public boolean insert(String table, Document document) {        MongoCollection<Document> collection = mongoDataBase.getCollection(table);        collection.insertOne(document);        long count = collection.count(document);        System.out.println("count: "+count);        if(count == 1){            System.out.println("文档插入成功");            return true;        }else{            System.out.println("文档插入成功");            return false;        }    }/** * insert many *  * @param db * @param table * @param document */public boolean insertMany(String table,List<Document> documents) {MongoCollection<Document> collection = mongoDataBase.getCollection(table);long preCount = collection.count();collection.insertMany(documents);long nowCount = collection.count();System.out.println("插入的数量: " + (nowCount - preCount));if ((nowCount - preCount) == documents.size()) {System.out.println("文档插入多个成功");return true;} else {System.out.println("文档插入多个失败");return false;}}public boolean delete( String table, BasicDBObject document) {MongoCollection<Document> collection = mongoDataBase.getCollection(table);DeleteResult deleteManyResult = collection.deleteMany(document);long deletedCount = deleteManyResult.getDeletedCount();System.out.println("删除的数量: " + deletedCount);if (deletedCount > 0) {System.out.println("文档删除多个成功");return true;} else {System.out.println("文档删除多个失败");return false;}}/** * 删除一个 *  * @param db * @param table * @param document */public boolean deleteOne(String table,BasicDBObject document) {MongoCollection<Document> collection = mongoDataBase.getCollection(table);DeleteResult deleteOneResult = collection.deleteOne(document);long deletedCount = deleteOneResult.getDeletedCount();System.out.println("删除的数量: " + deletedCount);if (deletedCount == 1) {System.out.println("文档删除一个成功");return true;} else {System.out.println("文档删除一个失败");return false;}}public boolean update( String table,BasicDBObject whereDoc, BasicDBObject updateDoc) {MongoCollection<Document> collection = mongoDataBase.getCollection(table);UpdateResult updateManyResult = collection.updateMany(whereDoc,new Document("$set", updateDoc));long modifiedCount = updateManyResult.getModifiedCount();System.out.println("修改的数量: " + modifiedCount);if (modifiedCount > 0) {System.out.println("文档更新多个成功");return true;} else {System.out.println("文档更新失败");return false;}}/** * update one Data *  * @param db * @param table * @param whereDoc * @param updateDoc */public boolean updateOne( String table,BasicDBObject whereDoc, BasicDBObject updateDoc) {MongoCollection<Document> collection = mongoDataBase.getCollection(table);UpdateResult updateOneResult = collection.updateOne(whereDoc,new Document("$set", updateDoc));long modifiedCount = updateOneResult.getModifiedCount();System.out.println("修改的数量: " + modifiedCount);if (modifiedCount == 1) {System.out.println("文档更新一个成功");return true;} else {System.out.println("文档更新失败");return false;}}/** * create collection *  * @param db * @param table */public void createCol( String table) {mongoDataBase.createCollection(table);System.out.println("集合创建成功");}/** * drop a collection *  * @param db * @param table */public void dropCol(String table) {mongoDataBase.getCollection(table).drop();System.out.println("集合删除成功");}public static Map<String, Integer> jsonStrToMap(String jsonString) {Object parseObj = JSON.parse(jsonString); // 反序列化 把json 转化为对象Map<String, Integer> map = (Map<String, Integer>) parseObj; // 把对象转化为mapreturn map;}}

这是参考其他作者的dao方法，个人修改了一些方法，可以更方便的适用于java

四：Service层

package com.suncar.core.services;import java.util.List;import java.util.Map;import org.bson.Document;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.mongodb.BasicDBObject;import com.suncar.core.dao.MongoDbDao;@Servicepublic class MongodbService {@Autowiredprivate MongoDbDao mongodbdao; /** * 获取当前表下所有数据 * @param table * @return */public List<Map<String,Integer>> queryAll(String table){return mongodbdao.queryAll(table);}/** * 插入数据 * @param table * @param document * @return */public boolean insert(String table, Document document){return mongodbdao.insert(table,document);}/** * 删除一个 * @param table * @param document * @return */public boolean deleteOne(String table, BasicDBObject document){return mongodbdao.deleteOne(table, document);}/** * 删除所有 * @param table * @param document * @return */public boolean delete(String table, BasicDBObject document){return mongodbdao.delete(table, document);}/** * 更新一个 * @param table * @param whereDoc * @param updateDoc * @return */public boolean updateOne(String table,BasicDBObject whereDoc, BasicDBObject updateDoc){return mongodbdao.updateOne(table, whereDoc, updateDoc);}/** * 更新所有 * @param table * @param whereDoc * @param updateDoc * @return */public boolean update(String table,BasicDBObject whereDoc, BasicDBObject updateDoc){return mongodbdao.update(table, whereDoc, updateDoc);}}

基本都是调用dao的方法，不过整合了spring作为接口更方便易用