Mongodb串連方法學習

項目中需要用到mongodb，據介紹mongodb的串連採用串連池的思路，可以僅保持一個執行個體，

參考http://blog.csdn.net/sheismylife/article/details/7090526的程式碼完成自己的mongodb串連池控制類。

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執行個體private Mongo mongo;//採用單例模式private MongoDBUtil(){}private static class InnerHolder{static final MongoDBUtil INSTANCE = new MongoDBUtil();}public static MongoDBUtil getInstance(){return InnerHolder.INSTANCE;}/** * 初始化Mongodb串連 * @throws UnknownHostException * @throws MongoException */public void init() throws UnknownHostException, MongoException{int poolSize = ConfigUtil.getInstance().getPoolSize(); //從設定檔中讀取串連個數if(poolSize == -1){poolSize = 10000;}System.setProperty("MONGO.POOLSIZE", String.valueOf(poolSize));if(this.mongo == null){//System.out.println("1st init Mongo instance"); //mongo執行個體僅執行個體化一次//從設定檔中讀取伺服器位址及連接埠號碼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;}}/** * 擷取DB執行個體 * @param dbName * @return */public DB getDB(String dbName){if(dbName != null && !dbName.equals("")){return this.mongo.getDB(dbName);}else{return null;}}/** * 關閉Mongodb */public void close(){if(this.mongo != null){this.mongo.close();this.mongo = null;}}}