Java操作MongoDB数据库实例共享
来源:爱站网时间:2018-12-10编辑:网友分享
Java操作MongoDB数据库实例共享,MongoDB是一个文档型数据库,是NOSQL家族中最重要的成员之一,以下代码封装了MongoDB的基本操作,具体都在备注当中,要仔细看哟。
Java操作MongoDB数据库实例共享,MongoDB是一个文档型数据库,是NOSQL家族中最重要的成员之一,以下代码封装了MongoDB的基本操作,具体都在备注当中,要仔细看哟。
MongoDBConfig.java
package com.posoftframework.mongodb; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.util.Enumeration; import java.util.HashMap; import java.util.Hashtable; import java.util.List; import java.util.Map; import java.util.Properties; import com.mongodb.DB; import com.mongodb.Mongo; /** * MongoDB配置类 * * @author yongtree * @date 2010-7-7 下午07:45:08 * @version 1.0 */ public class MongoDBConfig { private static Mongo mongo; private static DB db; private static final String MONGO_DB_ADDRESS = "localhost"; private static final int MONGO_DB_PORT = 27017; private static final String MONGO_DB_USERNAME = "root"; private static final String MONGO_DB_PASSWORD = "root"; private static final String MONGO_DB_DBNAME = "mongodb"; private static final String MONGO_DB_RESOURCE_FILE = "mongodb.cfg.properties"; /** * Mongo数据库参数 */ private static MapcfgMap = new HashMap (); private static Hashtable mongoDBs = new Hashtable (); /** * 初始化Mongo的数据库 */ static { init(); } public static File getConfigFile() { String path = MongoDBConfig.class.getResource("/").getPath(); String fileName = path + MONGO_DB_RESOURCE_FILE; File file = new File(fileName); if (file.exists()) { return file; } return null; } @SuppressWarnings("unchecked") private static void initCfgMap() { File file = getConfigFile(); if (file != null) { Properties p = new Properties(); try { p.load(new FileInputStream(file)); for (Enumeration enu = p.propertyNames(); enu.hasMoreElements();) { String key = (String) enu.nextElement(); String value = (String) p.getProperty(key); cfgMap.put(key, value); } } catch (IOException e) { System.out.println("记载Mongo配置文件失败!"); e.printStackTrace(); } } else { cfgMap.put("mongo.db.address", MONGO_DB_ADDRESS); cfgMap.put("mongo.db.port", String.valueOf(MONGO_DB_PORT)); cfgMap.put("mongo.db.username", MONGO_DB_USERNAME); cfgMap.put("mongo.db.password", MONGO_DB_PASSWORD); cfgMap.put("mongo.db.dbname", MONGO_DB_DBNAME); } } /** * 初始化Mongo数据库 */ private static void init() { initCfgMap(); try { String address = cfgMap.get("mongo.db.address"); int port = Integer.parseInt(cfgMap.get("mongo.db.port").toString()); String dbName = cfgMap.get("mongo.db.dbname"); String username = cfgMap.get("mongo.db.username"); String password = cfgMap.get("mongo.db.password"); mongo = new Mongo(address, port); if (dbName != null && !"".equals(dbName)) { db = mongo.getDB(dbName); if (username != null && !"".equals(username)) { db.addUser(username, password.toCharArray()); } mongoDBs.put(dbName, db); } } catch (IOException e) { e.printStackTrace(); } } /** * 得到Mongo的实例 * * @return */ public static Mongo getMongo() { return mongo; } /** * 得到Mongo的图片数据库 * * @return */ public static DB getDB() { return db; } public static List getDBNames() { return mongo.getDatabaseNames(); } /** * 根据数据库名称,得到数据库
* 如果不存在,则创建一个该名称的数据库,并设置用户名和密码为配置文件中的参数值 * * @param dbName * @return */ public static DB getDBByName(String dbName) { DB db = mongo.getDB(dbName); if (!mongoDBs.contains(db)) { db.addUser(cfgMap.get("mongo.db.username"), cfgMap.get( "mongo.db.password").toCharArray()); mongoDBs.put(dbName, db); } return db; } }
MongoService.java
/************************* 版权声明 ********************************* * * * 版权所有:百洋软件 * * Copyright (c) 2010 by www.po-soft.com * * * ************************* 变更记录 ********************************* * * 创建者:yongtree 创建日期: 2010-7-7 * 备注: * * 修改者: 修改日期: * 备注: * */ package com.posoftframework.mongodb; import java.util.List; import java.util.Map; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.DBObject; /** * 操作MongoDB的DAO接口 * * @author yongtree * @date 2010-7-7 下午04:44:43 * @version 1.0 */ public interface MongoService { public abstract DBCollection getCollection(); /** * 根据数据集合的Map,插入数据 map的key对应数据库中的DBCollection的key值 * * @param obj */ public abstract DBObject insert(DBObject obj); /** * 根据List
MongoServiceImpl.java
/************************* 版权声明 ********************************* * * * 版权所有:百洋软件 * * Copyright (c) 2010 by www.po-soft.com * * * ************************* 变更记录 ********************************* * * 创建者:yongtree 创建日期: 2010-7-7 * 备注: * * 修改者: 修改日期: * 备注: * */ package com.posoftframework.mongodb; import java.util.ArrayList; import java.util.List; import java.util.Map; import org.bson.types.ObjectId; import com.mongodb.BasicDBObject; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.DBCursor; import com.mongodb.DBObject; /** * * @author yongtree * @date 2010-7-7 下午07:22:15 * @version 1.0 */ public class MongoServiceImpl implements MongoService { private String dbName; private String collName; private DB db; public MongoServiceImpl(String dbName, String collName) { this.dbName = dbName; this.collName = collName; try { db = MongoDBConfig.getDBByName(this.dbName); } catch (Throwable e) { e.printStackTrace(); } } public MongoServiceImpl() { getDb(); } public DBCollection getCollection() { return db.getCollection(this.collName); } public DBObject map2Obj(Mapmap) { DBObject obj = new BasicDBObject(); if (map.containsKey("class") && map.get("class") instanceof Class) map.remove("class"); obj.putAll(map); return obj; } public DBObject insert(DBObject obj) { getCollection().insert(obj); return obj; } public void insertBatch(List list) { if (list == null || list.isEmpty()) { return; } List listDB = new ArrayList (); for (int i = 0; i list) { if (list == null || list.isEmpty()) { return; } for (int i = 0; i find(DBObject obj) { DBCursor cur = getCollection().find(obj); return DBCursor2list(cur); } @Override public List find(DBObject query, DBObject sort) { DBCursor cur; if (query != null) { cur = getCollection().find(query); } else { cur = getCollection().find(); } if (sort != null) { cur.sort(sort); } return DBCursor2list(cur); } @Override public List find(DBObject query, DBObject sort, int start, int limit) { DBCursor cur; if (query != null) { cur = getCollection().find(query); } else { cur = getCollection().find(); } if (sort != null) { cur.sort(sort); } if (start == 0) { cur.batchSize(limit); } else { cur.skip(start).limit(limit); } return DBCursor2list(cur); } private List DBCursor2list(DBCursor cur) { List list = new ArrayList (); if (cur != null) { list = cur.toArray(); } return list; } public void update(DBObject setFields, DBObject whereFields) { getCollection().updateMulti(setFields, whereFields); } public List findAll() { DBCursor cur = getCollection().find(); List list = new ArrayList (); if (cur != null) { list = cur.toArray(); } return list; } public DBObject getById(String id) { DBObject obj = new BasicDBObject(); obj.put("_id", new ObjectId(id)); DBObject result = getCollection().findOne(obj); return result; } public String getDbName() { return dbName; } public void setDbName(String dbName) { this.dbName = dbName; this.db = MongoDBConfig.getDBByName(this.dbName); } public String getCollName() { return collName; } public void setCollName(String collName) { this.collName = collName; } public DB getDb() { if (this.db == null) { if (this.dbName == null) { this.db = MongoDBConfig.getDB(); } else { this.db = MongoDBConfig.getDBByName(this.dbName); } } return this.db; } public List getAllDBNames() { return MongoDBConfig.getDBNames(); } }
到这里,Java操作MongoDB数据库实例共享的介绍就算完成了,如果您有哪些不清楚可以留言给我,如果觉得我写得不错的话,请给我一个大拇指,谢谢!