mydatasource.java

来自「本光盘包含了本书各章中出现的所有程序的源代码。 1. 如果是Java程序」· Java 代码 · 共 34 行

package com.util;

import java.sql.Connection;
import javax.naming.InitialContext;
import javax.sql.DataSource;

public class MyDataSource {
	private DataSource ds;
	
	private static MyDataSource instance;
	
	private MyDataSource() {
	}
	
	public static MyDataSource getInstance() {
		if(instance == null) {
			instance = new MyDataSource();
		}
		
		return instance;
	}
	
	public Connection getConnection() throws Exception {
		if(ds == null) {
			//初始化JNDI的查找工具对象
			InitialContext ctx = new InitialContext();
			//通过JNDI名称查找数据源对象
			ds = (DataSource)ctx.lookup("java:comp/env/jdbc/bbsbd");
		}
		
		return ds.getConnection();
	}
}