本文实例讲述了Java单例模式下的MongoDB数据库操作工具类。分享给大家供大家参考，具体如下：
我经常对MongoDB进行一些基础操作，将这些常用操作合并到一个工具类中，方便自己开发使用。
没用Spring Data、Morphia等框架是为了减少学习、维护成本，另外自己直接JDBC方式的话可以更灵活，为自己以后的积累留一个脚印。
JAVA驱动版本：
org.mongodb mongo-java-driver3.0.2
工具类代码如下：
package utils;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.configuration.CompositeConfiguration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.bson.document;
import org.bson.conversions.Bson;
import org.bson.types.ObjectId;
import com.mongodb.BasicDBObject;
import com.mongodb.MongoClient;
import com.mongodb.MongoClientOptions;
import com.mongodb.MongoClientOptions.Builder;
import com.mongodb.WriteConcern;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.MongoIterable;
import com.mongodb.client.model.Filters;
import com.mongodb.client.result.DeleteResult;
public enum MongoDBUtil {
instance;
private MongoClient mongoClient;
static {
System.out.println("===============MongoDBUtil初始化========================");
CompositeConfiguration config = new CompositeConfiguration();
try {
config.addConfiguration(new PropertiesConfiguration("mongodb.properties"));
} catch (ConfigurationException e) {
e.printStackTrace();
}
// 从配置文件中获取属性值
String ip = config.getString("host");
int port = config.getInt("port");
instance.mongoClient = new MongoClient(ip, port);
// or, to connect to a replica set, with auto-discovery of the primary, supply a seed list of members
// List listHost = Arrays.asList(new ServerAddress("localhost", 27017),new ServerAddress("localhost", 27018));
// instance.mongoClient = new MongoClient(listHost);
// 大部分用户使用mongodb都在安全内网下，但如果将mongodb设为安全验证模式，就需要在客户端提供用户名和密码：
// boolean auth = db.authenticate(myUserName, myPassword);
Builder options = new MongoClientOptions.Builder();
// options.autoConnectRetry(true);// 自动重连true
// options.maxAutoConnectRetryTime(10); // the maximum auto connect retry time
options.connectionsPerHost(300);// 连接池设置为300个连接,默认为100
options.connectTimeout(15000);// 连接超时，推荐>3000毫秒
options.maxWaitTime(5000); //
options.socketTimeout(0);// 套接字超时时间，0无限制
options.threadsAllowedToBlockForConnectionMultiplier(5000);// 线程队列数，如果连接线程排满了队列就会抛出“Out of semaphores to get db”错误。
options.writeConcern(WriteConcern.SAFE);//
options.build();
}
// ------------------------------------共用方法---------------------------------------------------
public MongoDatabase getDB(String dbName) {
if (dbName != null && !"".equals(dbName)) {
MongoDatabase database = mongoClient.getDatabase(dbName);
return database;
}
return null;
}
public MongoCollection getCollection(String dbName, String collName) {
if (null == collName || "".equals(collName)) {
return null;
}
if (null == dbName || "".equals(dbName)) {
return null;
}
MongoCollection collection = mongoClient.getDatabase(dbName).getCollection(collName);
return collection;
}
public List getAllCollections(String dbName) {
MongoIterable colls = getDB(dbName).listCollectionNames();
List _list = new ArrayList();
for (String s : colls) {
_list.add(s);
}
return _list;
}
public MongoIterable getAllDBNames() {
MongoIterable s = mongoClient.listDatabaseNames();
return s;
}
public void dropDB(String dbName) {
getDB(dbName).drop();
}
public document findById(MongoCollection coll, String id) {
ObjectId _idobj = null;
try {
_idobj = new ObjectId(id);
} catch (Exception e) {
return null;
}
document myDoc = coll.find(Filters.eq("_id", _idobj)).first();
return myDoc;
}
public int getCount(MongoCollection coll) {
int count = (int) coll.count();
return count;
}
public MongoCursor find(MongoCollection coll, Bson filter) {
return coll.find(filter).iterator();
}
public MongoCursor findByPage(MongoCollection coll, Bson filter, int pageNo, int pageSize) {
Bson orderBy = new BasicDBObject("_id", 1);
return coll.find(filter).sort(orderBy).skip((pageNo - 1) * pageSize).limit(pageSize).iterator();
}
public int deleteById(MongoCollection coll, String id) {
int count = 0;
ObjectId _id = null;
try {
_id = new ObjectId(id);
} catch (Exception e) {
return 0;
}
Bson filter = Filters.eq("_id", _id);
DeleteResult deleteResult = coll.deleteOne(filter);
count = (int) deleteResult.getDeletedCount();
return count;
}
public document updateById(MongoCollection coll, String id, document newdoc) {
ObjectId _idobj = null;
try {
_idobj = new ObjectId(id);
} catch (Exception e) {
return null;
}
Bson filter = Filters.eq("_id", _idobj);
// coll.replaceOne(filter, newdoc); // 完全替代
coll.updateOne(filter, new document("$set", newdoc));
return newdoc;
}
public void dropCollection(String dbName, String collName) {
getDB(dbName).getCollection(collName).drop();
}
public void close() {
if (mongoClient != null) {
mongoClient.close();
mongoClient = null;
}
}
public static void main(String[] args) {
String dbName = "GC_MAP_DISPLAY_DB";
String collName = "COMMUNITY_BJ";
MongoCollection coll = MongoDBUtil.instance.getCollection(dbName, collName);
// 插入多条
// for (int i = 1; i <= 4; i++) {
// document doc = new document();
// doc.put("name", "zhoulf");
// doc.put("school", "NEFU" + i);
// document interests = new document();
// interests.put("game", "game" + i);
// interests.put("ball", "ball" + i);
// doc.put("interests", interests);
// coll.insertOne(doc);
// }
// // 根据ID查询
// String id = "556925f34711371df0ddfd4b";
// document doc = MongoDBUtil2.instance.findById(coll, id);
// System.out.println(doc);
// 查询多个
// MongoCursor cursor1 = coll.find(Filters.eq("name", "zhoulf")).iterator();
// while (cursor1.hasNext()) {
// org.bson.document _doc = (document) cursor1.next();
// System.out.println(_doc.toString());
// }
// cursor1.close();
// 查询多个
// MongoCursor cursor2 = coll.find(Person.class).iterator();
// 删除数据库
// MongoDBUtil2.instance.dropDB("testdb");
// 删除表
// MongoDBUtil2.instance.dropCollection(dbName, collName);
// 修改数据
// String id = "556949504711371c60601b5a";
// document newdoc = new document();
// newdoc.put("name", "时候");
// MongoDBUtil.instance.updateById(coll, id, newdoc);
// 统计表
// System.out.println(MongoDBUtil.instance.getCount(coll));
// 查询所有
Bson filter = Filters.eq("count", 0);
MongoDBUtil.instance.find(coll, filter);
}
}
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希望本文所述对大家java程序设计有所帮助。
