还是数据库连接类 求完美

import java.sql.Connection;

import java.util.Collections;

import java.util.HashMap;

import java.util.Map;



import javax.naming.Context;

import javax.naming.InitialContext;

import javax.sql.DataSource;



public class DbConn {



	private static final String JNDI_NAME = "weblogic连接池的JNDI";

	

	private static Map dataSourceMap;

	

	static {

		dataSourceMap = Collections.synchronizedMap(new HashMap());

	}

	

	public static Connection getConnection() {

		try {

			DataSource dataSource = (DataSource) dataSourceMap.get(JNDI_NAME);

			if (null != dataSource) {

				return dataSource.getConnection();

			}

			Context context = new InitialContext();

			if (context == null) {

				System.out.println("Context is null");

			}

			dataSource = (DataSource) context.lookup(JNDI_NAME);

			dataSourceMap.put(JNDI_NAME, dataSource);

			return dataSource.getConnection();

		} catch (Exception e) {

			e.printStackTrace();

		}

		return null;

	}

	

}