Java操作MongoDB数据库示例分享
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。
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 Map<String, String> cfgMap = new HashMap<String, String>();
private static Hashtable<String, DB> mongoDBs = new Hashtable<String, DB>();
/**
* 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<String> getDBNames() {
return mongo.getDatabaseNames();
}
/**
* 根据数据库名称,得到数据库<br/>
* 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</br>
*
* @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<Map<String,Object>>结构的数据集合,插入数据
*
* @param list
*/
public abstract void insertBatch(List<DBObject> list);
/**
* 按照条件参数集合map,删除数据
*
* @param map
*/
public abstract void delete(DBObject obj);
/**
* 按照多种条件的并集,批量删除数据
*
* @param list
*/
public abstract void deleteBatch(List<DBObject> list);
/**
* 得到Collection()总的记录数
*
* @return
*/
public abstract long getCollectionCount();
public abstract long getCount(DBObject query);
public abstract List<DBObject> find(DBObject query);
public abstract List<DBObject> find(DBObject query,DBObject sort);
public abstract List<DBObject> find(DBObject query,DBObject sort,int start,int limit);
/**
* 根据whereFields参数,更新setFields值
*
* @param setFields
* @param whereFields
*/
public abstract void update(DBObject setFields,
DBObject whereFields);
public abstract List<DBObject> findAll();
/**
* 根据ID找到唯一数据 有1个id字段标记
*
* @param id
* @return
*/
public abstract DBObject getById(String id);
/**
* 获取所有数据库名称
*
* @return
*/
public List<String> getAllDBNames();
public abstract String getDbName();
public abstract void setDbName(String dbName);
public abstract DB getDb();
public abstract String getCollName();
public abstract void setCollName(String collName);
}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(Map<String, Object> map) {
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<DBObject> list) {
if (list == null || list.isEmpty()) {
return;
}
List<DBObject> listDB = new ArrayList<DBObject>();
for (int i = 0; i < list.size(); i++) {
listDB.add(list.get(i));
}
getCollection().insert(listDB);
}
public void delete(DBObject obj) {
getCollection().remove(obj);
}
public void deleteBatch(List<DBObject> list) {
if (list == null || list.isEmpty()) {
return;
}
for (int i = 0; i < list.size(); i++) {
getCollection().remove(list.get(i));
}
}
public long getCollectionCount() {
return getCollection().getCount();
}
public long getCount(DBObject obj) {
if (obj != null)
return getCollection().getCount(obj);
return getCollectionCount();
}
public List<DBObject> find(DBObject obj) {
DBCursor cur = getCollection().find(obj);
return DBCursor2list(cur);
}
@Override
public List<DBObject> 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<DBObject> 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<DBObject> DBCursor2list(DBCursor cur) {
List<DBObject> list = new ArrayList<DBObject>();
if (cur != null) {
list = cur.toArray();
}
return list;
}
public void update(DBObject setFields, DBObject whereFields) {
getCollection().updateMulti(setFields, whereFields);
}
public List<DBObject> findAll() {
DBCursor cur = getCollection().find();
List<DBObject> list = new ArrayList<DBObject>();
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<String> getAllDBNames() {
return MongoDBConfig.getDBNames();
}
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