連接池單例模式

1.私有化ComboPooledDataSource將其作為屬性，使其實現單例
2.DataSourceFactory實現懶漢模式,這樣作為屬性的連接池cpds也就變為了單例
3.從連接池中獲取連接Connection

代碼如下：

package com.tcb.dao.uitls;import java.sql.Connection;import com.mchange.v2.c3p0.ComboPooledDataSource;/** 連接池單例模式* * 1.私有化ComboPooledDataSource將其作為屬性，使其實現單例* 2.DataSourceFactory實現懶漢模式,這樣作為屬性的連接池cpds也就變為了單例* 3.從連接池中獲取連接Connection*/ public class DataSourceFactory {//1.私有化ComboPooledDataSource將其作為屬性，使其實現單例private ComboPooledDataSource cpds;//2.DataSourceFactory實現懶漢模式//2.1私有化構造方法--并初始化cpdsprivate DataSourceFactory() {cpds = new ComboPooledDataSource("c3p0-config");}//2.2 私有化屬性private static DataSourceFactory sFactory = null;//2.3 返回SessionFactory單例public static DataSourceFactory getSessionFactoryInstance() {if (sFactory == null) {sFactory = new DataSourceFactory();}return sFactory;}//3.從連接池中獲取連接Connectionpublic Connection getSession() throws Exception {System.out.println("cpsd========="+cpds);Connection connection = cpds.getConnection();System.out.println("connection========="+connection);return connection;}public static void main(String[] args) {//測試DataSourceFactory dataSourceFactory=DataSourceFactory.getSessionFactoryInstance();DataSourceFactory dataSourceFactory2=DataSourceFactory.getSessionFactoryInstance();try {dataSourceFactory.getSession();dataSourceFactory.getSession();dataSourceFactory.getSession();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}} }

測試結果：

總結

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