Druid数据库连接池简单工具类

//声明先得下载Druid包

http://central.maven.org/maven2/com/alibaba/druid/1.1.9/

还得有数据库的驱动包

//自己写druid.properties配置

Druid数据库连接池简单工具类

package com.JdbcUtli.druid;

import java.io.IOException;
import java.sql.*;
import java.util.Properties;

import javax.sql.DataSource;

import com.alibaba.druid.pool.DruidDataSourceFactory;

/*
* Druid连接池的工具类
*/
public class DruidUtil {
   private static DataSource ds;
   static {
       try {
           Properties pro=new Properties();//用于读取文件的对象
           pro.load(DruidUtil.class.getClassLoader().getResourceAsStream("druid.properties"));//从输入流中读取对象
           ds=DruidDataSourceFactory.createDataSource(pro);
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
   }
   public static Connection getConnection() throws SQLException//返回数据库连接对象
   {
       return ds.getConnection();
   }
   public static void close(ResultSet rs,PreparedStatement pres,Connection conn)//数据库连接对象返回连接池
   {
       if(rs!=null)
       {
           try {
               rs.close();
           } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }
       if(pres!=null)
       {
           try {
               pres.close();
           } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }
       if(conn!=null)
       {
           try {
               conn.close();
           } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }
   }
   public static void close(PreparedStatement pres,Connection conn)
   {
       close(null, pres, conn);
   }
   public static DataSource getDataSource()//返回连接池对象
   {
       return ds;
   }
}