Mongodb连接方法学习

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项目中需要用到mongodb，据介绍mongodb的连接采用连接池的思路，可以仅保持一个实例，

参考http://blog.csdn.net/sheismylife/article/details/7090526的代码完成自己的mongodb连接池控制类。

package cn.cnic.jingshao.mongodbapp.util;import java.net.UnknownHostException;import com.mongodb.DB;import com.mongodb.Mongo;import com.mongodb.MongoException;import com.mongodb.MongoOptions;public class MongoDBUtil {//唯一的Mongo实例private Mongo mongo;//采用单例模式private MongoDBUtil(){}private static class InnerHolder{static final MongoDBUtil INSTANCE = new MongoDBUtil();}public static MongoDBUtil getInstance(){return InnerHolder.INSTANCE;}/** * 初始化Mongodb连接 * @throws UnknownHostException * @throws MongoException */public void init() throws UnknownHostException, MongoException{int poolSize = ConfigUtil.getInstance().getPoolSize(); //从配置文件中读取连接个数if(poolSize == -1){poolSize = 10000;}System.setProperty("MONGO.POOLSIZE", String.valueOf(poolSize));if(this.mongo == null){//System.out.println("1st init Mongo instance"); //mongo实例仅实例化一次//从配置文件中读取服务器地址及端口号String serverIp = ConfigUtil.getInstance().getServerIP();int portNum = ConfigUtil.getInstance().getPortNum();mongo = new Mongo(serverIp, portNum);MongoOptions options = mongo.getMongoOptions();options.autoConnectRetry = true;options.connectionsPerHost = poolSize;}}/** * 获取DB实例 * @param dbName * @return */public DB getDB(String dbName){if(dbName != null && !dbName.equals("")){return this.mongo.getDB(dbName);}else{return null;}}/** * 关闭Mongodb */public void close(){if(this.mongo != null){this.mongo.close();this.mongo = null;}}}