mongo-java-driver操作MongoDB

引入依赖：

<dependency><groupId>org.mongodb</groupId><artifactId>mongo-java-driver</artifactId><version>3.8.2</version>
</dependency>

1、连接MongoDB数据库

1)直连方式

public class MongoDBUtil {private static MongoClient client = null;static {if(client==null){client = new MongoClient("192.168.3.56", 27017);}}//获取MongoDB数据库public static MongoDatabase getDatabase(String databaseName){return client.getDatabase(databaseName);}//获取Mongo集合public static MongoCollection getCollection(String databaseName,String collectionName){return getDatabase(databaseName).getCollection(collectionName);}
}

2)直连方式支持用户认证

/*** @author houChen* @date 2021/7/10 17:34* @Description: 创建MongoDB拦截，使用用户认证*/
public class MongoDBAuthUtil {private static MongoClient client = null;static {if(client==null){//创建一个用户认证信息MongoCredential credential = MongoCredential.createCredential("itsxt","develope","itsxtpwd".toCharArray());//封装MongoDB的地址和端口ServerAddress address = new ServerAddress("192.168.3.56", 27017);//方法过时是由于现在推荐池连的方式client = new MongoClient(address, Arrays.asList(credential));}}//获取MongoDB数据库public static MongoDatabase getDatabase(String databaseName){return client.getDatabase(databaseName);}//获取Mongo集合public static MongoCollection getCollection(String databaseName,String collectionName){return getDatabase(databaseName).getCollection(collectionName);}
}

3)池连方式

public class MongoDBPoolUtil {private static MongoClient client = null;static {if(client==null){MongoClientOptions.Builder builder = new MongoClientOptions.Builder();//设置每个连接地址的最大连接数builder.connectionsPerHost(10);//设置连接的超时时间builder.connectTimeout(5000);//设置读写的超时时间builder.socketTimeout(5000);ServerAddress address = new ServerAddress("192.168.3.56", 27017);client = new MongoClient(address,builder.build());}}//获取MongoDB数据库public static MongoDatabase getDatabase(String databaseName){return client.getDatabase(databaseName);}//获取Mongo集合public static MongoCollection getCollection(String databaseName, String collectionName){return getDatabase(databaseName).getCollection(collectionName);}
}

4)池连方式支持认证

/*** @author houChen* @date 2021/7/10 18:08* @Description:  支持用户认证的池连*/
public class MongoDBPoolAuthUtil {private static MongoClient client = null;static {if(client==null){MongoClientOptions.Builder builder = new MongoClientOptions.Builder();//设置每个连接地址的最大连接数builder.connectionsPerHost(10);//设置连接的超时时间builder.connectTimeout(5000);//设置读写的超时时间builder.socketTimeout(5000);//创建一个用户认证信息MongoCredential credential = MongoCredential.createCredential("itsxt","develope","itsxtpwd".toCharArray());//封装MongoDB的地址和端口ServerAddress address = new ServerAddress("192.168.3.56", 27017);client = new MongoClient(address,credential,builder.build());}}//获取MongoDB数据库public static MongoDatabase getDatabase(String databaseName){return client.getDatabase(databaseName);}//获取Mongo集合public static MongoCollection getCollection(String databaseName, String collectionName){return getDatabase(databaseName).getCollection(collectionName);}
}

2、操作集合

1)创建集合

MongoDatabase develope = MongoDBPoolUtil.getDatabase("develope");
develope.createCollection("test1");

2)获取集合

MongoCollection<Document> test = develope.getCollection("test");
System.out.println(test.getNamespace());

3)删除集合

MongoCollection<Document> test = develope.getCollection("test1");
test.drop();

3、插入文档

1)单个文档插入

public void insertSingleDocument(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");Document document = new Document();document.append("username","liss").append("age",18 ).append("desc", "prefect");collection.insertOne(document);
}

2)插入多个文档

public void insertManyDocument(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");List<Document> list = new ArrayList<Document>();for(int i=0;i<5;i++){Document document = new Document();document.append("username","liss"+i).append("age",18+i ).append("desc", "prefect"+i);list.add(document);}collection.insertMany(list);
}

4、更新文档

1)更新单个文档单个键

/*
更新单个文档单个key*/
public void updateSingleDocumentSingleKey(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");collection.updateOne(Filters.eq("username","liss"),new Document("$set",new Document("userage",100)));
}

2)更新单个文档多个键

/*
更新单个文档多个键*/
public void updateSingleDocumentManyKey(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");collection.updateOne(Filters.eq("username","liss"),new Document("$set",new Document("userage",100).append("age", "13")));
}

3)更新多个文档单个键

/*
更新单个文档单个个键
将username不为空的文档的age修改为100*/
public void updateManyDocumentSingleKey(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");collection.updateMany(Filters.ne("username",null),new Document("$set",new Document("desc","very good")));
}

4)更新多个文档的多个键

/*
更新多个文档多个键
将username不为空的文档的age修改为3岁,desc修改为哈哈哈哈*/public void updateManyDocumentManyKey(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");collection.updateMany(Filters.ne("username",null),new Document("$set",new Document("age","3岁").append("desc", "哈哈哈哈")));}

5)更新文档的数组

/*更新文档的数组将username为lisi的insterts数组中添加art*/
public void updateArray(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");collection.updateOne(Filters.eq("username", "liss"),new Document("$push",new Document("insterts","art")));
}

5、查询文档

1)查询所有文档

public void searchAllDocument(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");FindIterable<Document> iterable = collection.find(); //返回的是一个迭代器MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("username")+" "+document.get("age"));}
}

2)根据_id查询文档

/*
根据_id查询文档*/
public void searchDocumentById(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");FindIterable<Document> iterable = collection.find(Filters.eq("_id",new ObjectId("60ea475b28339539c8b814f4"))); //返回的是一个迭代器MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("username")+" "+document.get("age"));}
}

3)查询多个文档 $gt

/*查询多个文档 $gt查询年龄大于19的文档*/
public void searchDocumentByCondition(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");FindIterable<Document> iterable = collection.find(Filters.gt("age",19)); //返回的是一个迭代器MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("username")+" "+document.get("age"));}
}

4)查询多个文档 $type

/*查询多个文档 $type查询age为number文档*/
public void searchDocumentByType(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");FindIterable<Document> iterable = collection.find(Filters.type("age","number")); //返回的是一个迭代器MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("username")+" "+document.get("age"));}
}

5)查询多个文档 $in $nin

/*查询多个文档 $in查询username为liss,liss1,liss2文档$nin=>表示不在这个数组中的文档 ·*/
public void searchDocumentByIn(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");FindIterable<Document> iterable = collection.find(Filters.in("username","liss","liss1","liss2")); //返回的是一个迭代器MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("username")+" "+document.get("age"));}
}

6)查询多个文档 $regex (根据正则表达式来查询)

/*查询多个文档 $regex查询以l开头，2结尾的文档*/
public void searchDocumentByRegex(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");FindIterable<Document> iterable = collection.find(Filters.regex("username","^l.*2$")); //返回的是一个迭代器MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("username")+" "+document.get("age"));}
}

7)查询多个文档逻辑运算符 $and $or

/*
查询文档 逻辑运算符$and
查询用户名称为liss1 年龄为18的文档*/
public void searchDocumentByAnd(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");FindIterable<Document> iterable = collection.find(Filters.and(Filters.eq("username","liss"),Filters.eq("age", 18))); //返回的是一个迭代器MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("username")+" "+document.get("age"));}
}/*
查询文档 逻辑运算符$or
查询用户名称为liss1 或者年龄为18的文档*/
public void searchDocumentByAnd(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");FindIterable<Document> iterable = collection.find(Filters.or(Filters.eq("username","liss"),Filters.eq("age", 18))); //返回的是一个迭代器MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("username")+" "+document.get("age"));}
}

8)查询文档 - 排序处理

/*
查询文档  $and和$or联合使用
查询文档，根据userName降序排序*/
public void searchDocumentBySort(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");FindIterable<Document> iterable = collection.find().sort(new Document("username", 1));MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("username")+" "+document.get("age"));}
}

6、日期操作

1)插入系统当前日期

/*
插入系统当前日期*/
public void insertSystemDate(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","date");Document document = new Document();document.put("username", "zhangsan");document.put("age", 22);document.put("desc", "very good");document.put("userBirth", new Date());collection.insertOne(document);
}

2)添加指定日期

/*
插入指定日期*/public void insertDate() throws ParseException {MongoCollection collection = MongoDBPoolUtil.getCollection("develope","date");SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");Date date = simpleDateFormat.parse("2021-07-16 08:00:00");Document document = new Document();document.put("username", "zhangsan");document.put("age", 22);document.put("desc", "very good");document.put("userBirth", date);collection.insertOne(document);}

3)查询日期 $eq

/*
查询日期 $qe*/
public void searchByDate() throws ParseException {MongoCollection collection = MongoDBPoolUtil.getCollection("develope","date");SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");Date date = simpleDateFormat.parse("2021-07-16 08:00:00");FindIterable<Document> iterable = collection.find(Filters.eq("userBirth",date)); //返回的是一个迭代器MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("username")+" "+ document.get("age")+" "+document.get("userBirth"));}
}

【注意】java会将mongo中查出来的时间自动转化时区

7、聚合操作

1)计算文档总数

查询test集合中文档的数量

/*
$sum
查询集合中的文档数量*/
public void selectDocumentAggregateCount(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test");Document sum = new Document();sum.put("$sum", 1);Document count = new Document();count.put("_id", null);count.put("count",sum);Document group = new Document();group.put("$group",count);List<Document> list = new ArrayList<Document>();list.add(group);AggregateIterable iterable = collection.aggregate(list);MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("_id")+" "+document.get("count"));}
}

2)聚合操作 $sum

以title进行分组，并计算每组size的总和

public void selectDocumentAggregateSizeSum(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test1");Document sum = new Document();sum.put("$sum", "$size");Document count = new Document();count.put("_id", "$title");count.put("count",sum);Document group = new Document();group.put("$group",count);List<Document> list = new ArrayList<Document>();list.add(group);AggregateIterable iterable = collection.aggregate(list);MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("_id")+" "+document.get("count"));}
}

3)聚合操作：分组前的数据过滤

查询dev集合size > 200 的文档，并按照title分组，计算size的总和

/*聚合操作：分组前的数据过滤查询dev集合有多少size > 200 的文档*/
public void selectDocumentAggregateSizeGt200(){MongoCollection collection = MongoDBPoolUtil.getCollection("develope","test");Document size = new Document();size.put("size", new Document().append("$gt", 200));Document match = new Document();match.put("$match", size);Document sum = new Document();sum.put("$sum", "$size");Document count = new Document();count.put("_id", "$title");count.put("count",sum);Document group = new Document();group.put("$group",count);List<Document> list = new ArrayList<Document>();list.add(match);list.add(group);AggregateIterable iterable = collection.aggregate(list);MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("_id")+" "+document.get("count"));}
}

4)聚合操作 $project 聚合投影约束

5)分页操作使用skip和limit进行分页

/*
分页操作 使用skip和limit进行分页*/
public void selectDocumentByPage(int page) {MongoCollection collection = MongoDBPoolUtil.getCollection("develope", "test");FindIterable iterable = collection.find().skip((page - 1) * 2).limit(2);MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("_id")+" "+document.get("title")+" "+document.get("size"));}
}

6)分页查询优化

使用条件判断替换skip方法

=》查询大于某个条件的所有文档，然后再进行分页

/*
分页操作 使用条件判断实现分页查询*/
public void selectDocumentByPage1(int pageIndex,int page,String lastId) {MongoCollection collection = MongoDBPoolUtil.getCollection("develope", "test");FindIterable iterable = null;Document condition = new Document();if(pageIndex==1){iterable = collection.find(condition).limit(page);}else{if(lastId != null){condition.append("_id", new Document("$gt",new ObjectId(lastId));iterable = collection.find(condition).limit(page);}}MongoCursor<Document> cursor = iterable.iterator();  //返回的是一个游标while (cursor.hasNext()){Document document = cursor.next();System.out.println(document.get("_id")+" "+document.get("title")+" "+document.get("size"));}
}