懒汉式单利同步链接jdbc数据库

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package com.fh.util.test;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;/** * 类名称：SingletonJDBCConnection 测试链接数据库* 创建人：toshiba * 创建时间：2017年9月2日16:11:12* @version*/
public class SingletonJDBCConnection {private static SingletonJDBCConnection instance;private SingletonJDBCConnection() {super();}public static SingletonJDBCConnection getInstance(){if(null==instance){synchronized (SingletonJDBCConnection.class) {if(null==instance){instance = new SingletonJDBCConnection();}return instance;}}return instance;}private static final String URL="jdbc:mysql://127.0.0.1:3306/*****?useUnicode=true&characterEncoding=utf8&characterSetResults=utf8";private static final String USERNAME="****";private static final String PASSWORD="****";private Connection conn=null;protected Connection getConnection(){try {DriverManager.registerDriver(new com.mysql.jdbc.Driver());conn =DriverManager.getConnection(URL, USERNAME, PASSWORD);} catch (SQLException e) {e.printStackTrace();} return conn;}
}

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