自己的mongodb的CRUD封装

工具类：
package Utils;

import com.google.common.collect.Lists;
import com.mongodb.MongoClient;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;
import com.mongodb.client.result.UpdateResult;
import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;
import org.bson.Document;
import org.bson.conversions.Bson;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

public class MongoDBUtil {
    private static MongoDBUtil mongoDBUtil;

    private static final String PLEASE_SEND_IP = "没有传入ip或者端口号";
    private static final String PLEASE_INSTANCE_MONGOCLIENT = "请实例化MongoClient";
    private static final String PLEASE_SEND_MONGO_REPOSITORY = "请指定要删除的mongo库";
    private static final String DELETE_MONGO_REPOSITORY_EXCEPTION = "删除mongo库异常";
    private static final String DELETE_MONGO_REPOSITORY_SUCCESS = "批量删除mongo库成功";
    private static final String NOT_DELETE_MONGO_REPOSITORY = "未删除mongo库";
    private static final String DELETE_MONGO_REPOSITORY = "成功删除mongo库：";
    private static final String CREATE_MONGO_COLLECTION_NOTE = "请指定要创建的库";
    private static final String NO_THIS_MONGO_DATABASE = "未找到指定mongo库";
    private static final String CREATE_MONGO_COLLECTION_SUCCESS = "创建mongo库成功";
    private static final String CREATE_MONGO_COLLECTION_EXCEPTION = "创建mongo库错误";
    private static final String NOT_CREATE_MONGO_COLLECTION = "未创建mongo库collection";
    private static final String CREATE_MONGO_COLLECTION_SUCH = "创建mongo库collection：";
    private static final String NO_FOUND_MONGO_COLLECTION = "未找到mongo库collection";
    private static final String INSERT_DOCUMEN_EXCEPTION = "插入文档失败";
    private static final String INSERT_DOCUMEN_SUCCESSS = "插入文档成功";


    private static final Logger logger = Logger.getLogger(MongoDBUtil.class);

    private MongoDBUtil(){

    }

    private static class SingleHolder{
        private static MongoDBUtil mongoDBUtil = new MongoDBUtil();
    }

    public static MongoDBUtil instance(){

        return SingleHolder.mongoDBUtil;
    }

    public static MongoDBUtil getMongoDBUtilInstance(){
        if(mongoDBUtil == null){
            return new MongoDBUtil();
        }
        return mongoDBUtil;
    }

    /**
     * 获取mongoDB连接
     * @param host
     * @param port
     * @return
     */
    public MongoClient getMongoConnect(String host,Integer port){

        if(StringUtils.isBlank(host) || null == port){
            logger.error(PLEASE_SEND_IP);
            return null;
        }

        return new MongoClient(host, port);
    }


    /**
     * 批量删除mongo库
     * @param mongoClient
     * @param dbNames
     * @return
     */
    public String bulkDropDataBase(MongoClient mongoClient,String...dbNames){

        if(null == mongoClient) return PLEASE_INSTANCE_MONGOCLIENT;

        if(null==dbNames || dbNames.length==0){
            return PLEASE_SEND_MONGO_REPOSITORY;
        }
        try {
            Arrays.asList(dbNames).forEach(dbName -> mongoClient.dropDatabase(dbName));
            logger.info(DELETE_MONGO_REPOSITORY_SUCCESS);
        }catch (Exception e){
            e.printStackTrace();
            logger.error(DELETE_MONGO_REPOSITORY_EXCEPTION);
        }
        return dbNames == null ? NOT_DELETE_MONGO_REPOSITORY:DELETE_MONGO_REPOSITORY + String.join(",",dbNames);
    }


    /**
     * 创建指定database的collection
     * @param mongoClient
     * @param dbName
     * @param collections
     * @return
     */
    public String createCollections(MongoClient mongoClient,String dbName,String...collections){

        if(null == mongoClient) return PLEASE_INSTANCE_MONGOCLIENT;

        if(null==collections || collections.length==0){
            return CREATE_MONGO_COLLECTION_NOTE;
        }

        MongoDatabase mongoDatabase = mongoClient.getDatabase(dbName);
        if(null == mongoDatabase) return NO_THIS_MONGO_DATABASE;

        try {
            Arrays.asList(collections).forEach(collection ->  mongoDatabase.createCollection(collection));
            logger.info(CREATE_MONGO_COLLECTION_SUCCESS);
            return collections == null ? NOT_CREATE_MONGO_COLLECTION:CREATE_MONGO_COLLECTION_SUCH + String.join(",",collections);
        }catch (Exception e){
            e.printStackTrace();
            logger.error(CREATE_MONGO_COLLECTION_EXCEPTION);
        }

        return null;
    }

    /**
     * 获取MongoCollection
     * @param mongoClient
     * @param dbName
     * @param collection
     * @return
     */
    public MongoCollection<Document> getMongoCollection(MongoClient mongoClient,String dbName,String collection){

        if(null == mongoClient) return null;

        if(StringUtils.isBlank(dbName)) return null;

        if(StringUtils.isBlank(collection)) return null;

        MongoDatabase mongoDatabase = mongoClient.getDatabase(dbName);

        MongoCollection<Document> collectionDocuments = mongoDatabase.getCollection(collection);

        if(null == collectionDocuments) return null;

        return collectionDocuments;
    }

    /**
     * 获取到MongoClient
     * @param ip
     * @param port
     * @param userName
     * @param dbName
     * @param psw
     * @returnMongoClient
     */
    public static MongoClient getMongoClientByCredential(String ip,int port,String userName,String dbName,String psw){
        ServerAddress serverAddress = new ServerAddress(ip,port);
        List<ServerAddress> addrs = new ArrayList<ServerAddress>();
        addrs.add(serverAddress);

        //MongoCredential.createScramSha1Credential()三个参数分别为 用户名 数据库名称 密码
        MongoCredential credential = MongoCredential.createScramSha1Credential(userName, dbName, psw.toCharArray());
        List<MongoCredential> credentials = new ArrayList<MongoCredential>();
        credentials.add(credential);

        //通过连接认证获取MongoDB连接
        MongoClient mongoClient = new MongoClient(addrs,credentials);
        return mongoClient;
    }


    /**
     * 插入文档数据
     * @param mongoCollection
     * @param params
     */
    public void insertDoucument(final MongoCollection<Document> mongoCollection, final Map<String,Object> params){
        if(null == mongoCollection) return;

        try {
            Document document = new Document();
            params.keySet().stream().forEach(field -> document.append(field, params.get(field)));

            List<Document> documents = Lists.newArrayList();
            documents.add(document);
            mongoCollection.insertMany(documents);
            logger.info(INSERT_DOCUMEN_SUCCESSS);
        }catch (Exception e){
            e.printStackTrace();
            logger.error(INSERT_DOCUMEN_EXCEPTION);
        }
    }

    /**
     * 更新文档
     * @param mongoCollection
     * @param conditionParams
     * @param updateParams
     */
    public  void updateDocument(final MongoCollection<Document> mongoCollection,final Map<String,Object> conditionParams,
                               final Map<String,Object> updateParams
    ){

        if(null == mongoCollection) return;

        if (null == conditionParams) return;

        if (null == updateParams) return;


        Document conditonDocument = new Document();
        conditionParams.keySet().stream().filter(p -> null != p).forEach(o -> {
            conditonDocument.append(o,conditionParams.get(o));
        });


        Document updateDocument = new Document();
        updateParams.keySet().stream().filter(p -> null != p).forEach(o -> {
            updateDocument.append(o,updateParams.get(o));
        });
        UpdateResult updateResult = mongoCollection.updateMany(conditonDocument,new Document("$set",updateDocument));

        System.out.println("修改了："+updateResult.getModifiedCount()+" 条数据 ");

    }

    /**
     *删除文档
     * @param mongoCollection
     * @param multiple
     * @param conditionParams
     * @return
     */
    public long deleteDocument(final MongoCollection<Document> mongoCollection,final boolean multiple,
                               final Map<String,Object> conditionParams){

        if(null == mongoCollection) return 0;

        if(null == conditionParams) return 0;

        Document document = new Document();

        conditionParams.keySet().stream().filter(p -> null != p).forEach(o -> {
            document.append(o,conditionParams.get(o));
        });

        if(multiple) {
            return mongoCollection.deleteMany(document).getDeletedCount();
        }

        //删除文档第一条
        return mongoCollection.deleteOne(document).getDeletedCount();
    }

    /**
     * 查询文档 带范围查找、分页、排序
     * @param mongoCollection
     * @param conditionParams
     * @param limit
     * @param skip
     * @param sortParams
     */
    public FindIterable<Document> queryDocument(final MongoCollection<Document> mongoCollection, final Map<String,Object> conditionParams,
                             final Integer limit, final Integer skip, final Map<String,Integer> sortParams,
                             final Map<String,Integer> gtLtOrOtherParams,final String compareField
    ){

        if(null == mongoCollection) return null;

        FindIterable<Document> findIterable = mongoCollection.find();

        if(null == conditionParams || null == findIterable) return findIterable;

        Document document = new Document();
        conditionParams.keySet().stream().filter(p -> null!=p).forEach(o -> document.append(o,conditionParams.get(o)));

        findIterable = findIterable.filter(document);

        MongoCursor<Document> mongoCursor = findIterable.iterator();
        while(mongoCursor.hasNext()){
            System.out.println(mongoCursor.next());
        }
        if(null == findIterable || null == gtLtOrOtherParams) return findIterable;

        Document gtOrLtDoc = new Document();
        gtLtOrOtherParams.keySet().stream().filter(p -> null!=p).forEach(o -> gtOrLtDoc.append(o,gtLtOrOtherParams.get(o)));

        findIterable = findIterable.filter(new Document(compareField,gtOrLtDoc));

        if(null == findIterable || null == limit) return findIterable;
        findIterable = findIterable.limit(limit);

        if(null == findIterable || null == skip) return findIterable;
        findIterable = findIterable.skip(skip);

        if(null == sortParams) return findIterable;

        Document sortDocument = new Document();
        sortParams.keySet().stream().filter(p -> null!=p).forEach(o -> sortDocument.append(o,sortParams.get(o)));

        findIterable = findIterable.filter(sortDocument);
        MongoCursor<Document> mongoCursor2 = findIterable.iterator();
        while(mongoCursor2.hasNext()){
            System.out.println(mongoCursor2.next());
        }

        return findIterable;

    }

    /**
     * 全文查询
     * @param mongoCollection
     * @return
     */
    public FindIterable<Document>  queryDocument(final MongoCollection<Document> mongoCollection
    ){
        if(null == mongoCollection) return null;
        FindIterable<Document> findIterable = mongoCollection.find();
        return findIterable;
    }

    /**
     *带排序的查询
     * @param mongoCollection
     * @param conditionParams
     * @param limit
     * @param skip
     * @param sortParams
     * @return
     */
    public FindIterable<Document> queryDocument(final MongoCollection<Document> mongoCollection, final Map<String,Object> conditionParams,
                                               final Integer limit, final Integer skip, final Map<String,Integer> sortParams

    ){
        if(null == mongoCollection) return null;
        /**
         * 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
         * */
        FindIterable<Document> findIterable = mongoCollection.find();
        if(null == conditionParams || null == findIterable) return findIterable;
        Document document = new Document();
        conditionParams.keySet().stream().filter(p -> null!=p).forEach(o -> document.append(o,conditionParams.get(o)));
        findIterable = findIterable.filter(document);

        if(null == findIterable || null == limit) return findIterable;
        findIterable = findIterable.limit(limit);

        if(null == findIterable || null == skip) return findIterable;
        findIterable = findIterable.skip(skip);

        if(null == sortParams) return findIterable;

        Document sortDocument = new Document();
        sortParams.keySet().stream().filter(p -> null!=p).forEach(o -> sortDocument.append(o,sortParams.get(o)));
        findIterable = findIterable.sort(sortDocument);

        return findIterable;

    }

    /**
     * 查询文档 简单条件查询
     * @param mongoCollection
     * @param conditionParams
     * @return
     */
    public FindIterable<Document> queryDocument(final MongoCollection<Document> mongoCollection, final Map<String,Object> conditionParams
    ){

        if(null == mongoCollection) return null;

        FindIterable<Document> findIterable = mongoCollection.find();

        if(null == conditionParams || null == findIterable) return findIterable;

        Document document = new Document();
        conditionParams.keySet().stream().filter(p -> null!=p).forEach(o -> document.append(o,conditionParams.get(o)));
        findIterable = findIterable.filter(document);

        return findIterable;

    }


    /**
     * 用于输出部分的列信息
     * @param documents
     */
    public void printDocuments(FindIterable<Document> documents, String[] fields) {
        if (fields != null && fields.length > 0) {
            int num = 0;
            for (Document d : documents) {
                StringBuilder stringBuilder = new StringBuilder();
                for (int i = 0; i < fields.length; i++) {
                    if(fields[i].equals("catm")){

                    }
                    stringBuilder.append(fields[i] + ": "+d.getString(fields[i])+" ");
                }
                System.out.println("第" + (++num) + "条数据： " + stringBuilder);

            }
        }
    }

    /**
     * 用于输出所有的列信息
     * @param documents
     */
    public void printDocuments(FindIterable<Document> documents) {
        int num = 0;
        for (Document d : documents) {
            System.out.println("第" + (++num) + "条数据： " + d.toString());
        }
    }

}

　　测试类：

public class Mongo {

    public static void main(String[] args) {

        MongoDBUtil mongoDBUtil = MongoDBUtil.getMongoDBUtilInstance();
        //MongoClient client = MongoDBUtil.instance().getMongoConnect("127.0.0.1",27017); 连接本地的mongo
        MongoClient client = mongoDBUtil.getMongoClientByCredential("127.0.0.1",27017,"my","my","my");

        try {
            MongoCollection<Document> collection = mongoDBUtil.getMongoCollection(client,"whale","wb0097waterdepartmentbasic");

            //1、 简单的条件查询
            Map<String,Object> conditionParams = Maps.newHashMap();
            conditionParams.put("wbtp","003");
            FindIterable<Document> documents =  mongoDBUtil.queryDocument(collection,conditionParams);
            mongoDBUtil.printDocuments(documents);

            //插入文档
           for(int i=0;i<=100;i++) {
                Map<String, Object> params = Maps.newHashMap();
                params.put("qq", "zy");
                params.put("time", new Date());
                params.put("name", "bb" + i);
               params.put("num", i);
                mongoDBUtil.insertDoucument(collection, params);
            }

            //更改文档
            Map<String,Object> condParams = Maps.newHashMap();
            condParams.put("description","database");
            condParams.put("aa","bbb");
            Map<String,Object> updateParams = Maps.newHashMap();
            updateParams.put("description","eee");
            MongoDBUtil.instance().updateDocument(collection,condParams,updateParams);

//            //删除文档数据
            Map<String,Object> condParams1 = Maps.newHashMap();
            condParams.put("qq",1111);
//
            MongoDBUtil.instance().deleteDocument(collection,true,condParams1);

            //复杂的查询文档
           Map<String,Object> condParams2 = Maps.newHashMap();
            condParams.put("qq","zy");
            Map<String,Integer> sortParams = Maps.newHashMap();
            sortParams.put("num",-1);
            sortParams.put("name",1);
            Map<String,Integer> compareParams = Maps.newHashMap();
            compareParams.put("$gt",75);
            compareParams.put("$lt",83);
            FindIterable<Document> documents1 = MongoDBUtil.instance().queryDocument(collection,condParams2,10,0,sortParams,compareParams,"num");
            mongoDBUtil.printDocuments(documents1);
        } catch (Exception e) {
            System.err.println(e.getClass().getName() + ": " + e.getMessage());
        }

    }
}