JAVA驱动版本: - <!-- MongoDB驱动 -->
- <dependency>
- <groupId>org.mongodb</groupId>
- <artifactId>mongo-java-driver</artifactId>
- <version>3.0.2</version>
- </dependency>
-
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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;
- /**
- * MongoDB工具类 Mongo实例代表了一个数据库连接池,即使在多线程的环境中,一个Mongo实例对我们来说已经足够了<br>
- * 注意Mongo已经实现了连接池,并且是线程安全的。 <br>
- * 设计为单例模式, 因 MongoDB的Java驱动是线程安全的,对于一般的应用,只要一个Mongo实例即可,<br>
- * Mongo有个内置的连接池(默认为10个) 对于有大量写和读的环境中,为了确保在一个Session中使用同一个DB时,<br>
- * DB和DBCollection是绝对线程安全的<br>
- *
- * @author zhoulingfei
- * @date 2015-5-29 上午11:49:49
- * @version 0.0.0
- * @Copyright (c)1997-2015 NavInfo Co.Ltd. All Rights Reserved.
- */
- public enum MongoDBUtil {
- /**
- * 定义一个枚举的元素,它代表此类的一个实例
- */
- 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<ServerAddress> 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---------------------------------------------------
- /**
- * 获取DB实例 - 指定DB
- *
- * @param dbName
- * @return
- */
- public MongoDatabase getDB(String dbName) {
- if (dbName != null && !"".equals(dbName)) {
- MongoDatabase database = mongoClient.getDatabase(dbName);
- return database;
- }
- return null;
- }
- /**
- * 获取collection对象 - 指定Collection
- *
- * @param collName
- * @return
- */
- public MongoCollection<Document> getCollection(String dbName, String collName) {
- if (null == collName || "".equals(collName)) {
- return null;
- }
- if (null == dbName || "".equals(dbName)) {
- return null;
- }
- MongoCollection<Document> collection = mongoClient.getDatabase(dbName).getCollection(collName);
- return collection;
- }
- /**
- * 查询DB下的所有表名
- */
- public List<String> getAllCollections(String dbName) {
- MongoIterable<String> colls = getDB(dbName).listCollectionNames();
- List<String> _list = new ArrayList<String>();
- for (String s : colls) {
- _list.add(s);
- }
- return _list;
- }
- /**
- * 获取所有数据库名称列表
- *
- * @return
- */
- public MongoIterable<String> getAllDBNames() {
- MongoIterable<String> s = mongoClient.listDatabaseNames();
- return s;
- }
- /**
- * 删除一个数据库
- */
- public void dropDB(String dbName) {
- getDB(dbName).drop();
- }
- /**
- * 查找对象 - 根据主键_id
- *
- * @param collection
- * @param id
- * @return
- */
- public Document findById(MongoCollection<Document> 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;
- }
- /** 统计数 */
- public int getCount(MongoCollection<Document> coll) {
- int count = (int) coll.count();
- return count;
- }
- /** 条件查询 */
- public MongoCursor<Document> find(MongoCollection<Document> coll, Bson filter) {
- return coll.find(filter).iterator();
- }
- /** 分页查询 */
- public MongoCursor<Document> findByPage(MongoCollection<Document> 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();
- }
- /**
- * 通过ID删除
- *
- * @param coll
- * @param id
- * @return
- */
- public int deleteById(MongoCollection<Document> 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;
- }
- /**
- * FIXME
- *
- * @param coll
- * @param id
- * @param newdoc
- * @return
- */
- public Document updateById(MongoCollection<Document> 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();
- }
- /**
- * 关闭Mongodb
- */
- public void close() {
- if (mongoClient != null) {
- mongoClient.close();
- mongoClient = null;
- }
- }
- /**
- * 测试入口
- *
- * @param args
- */
- public static void main(String[] args) {
- String dbName = "GC_MAP_DISPLAY_DB";
- String collName = "COMMUNITY_BJ";
- MongoCollection<Document> 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<Document> 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<Person> 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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