java web数据库连接封装-simple

package cn.cslg.bm.web.util;

import java.sql.Connection;

import java.sql.DriverManager;

import org.apache.log4j.Logger;

/**

 * 返回数据库连接

 * @author husky

 * 未使用

 */

public class DBSimpleUtil {

    private static Logger logger = Logger.getLogger(DBSimpleUtil.class);

    public static String URL="jdbc:mysql://******:3306/bm?characterEncoding=UTF-8";

    public static String USER="*****";

    public static String PASS="******";

    public static Connection conn=null;

    static {

        try {

            Class.forName("com.mysql.jdbc.Driver");

        } catch (ClassNotFoundException e) {

            e.printStackTrace();

        }

    }

    public static Connection openConnection(){

        System.out.println("test");

        try{

            if(conn==null||conn.isClosed())

                logger.info("打开数据库！");

                conn=DriverManager.getConnection(URL, USER, PASS);

        }catch(Exception e){

            logger.error("打开数据库出错！");

            e.printStackTrace();

        }

        return conn;

    }

    public static void closeConnection(){

        try{

            if(conn!=null&&!conn.isClosed()){

                logger.info("关闭数据库！");

                conn.close();

            }

        }catch(Exception e){

            logger.error("关闭数据库出错！");

            e.printStackTrace();

        }

    }

//    public static void main(String[] args) {

//        DBSimpleUtil.openConnection();

//        DBSimpleUtil.closeConnection();

//    }

}