Druid连接池的工具类

一、代码

package util;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

//Druid连接池的工具类
public class DruidUtils {
    //提供方法
    //供静态代码块加载配置文件，初始化连接池对象
    private static DataSource ds;
    static {
        //1.加载配置文件
        try {
            Properties pro = new Properties();
            pro.load(DruidUtils.class.getClassLoader().getResourceAsStream("druid.properties"));
            //2.获取datasource
            ds = DruidDataSourceFactory.createDataSource(pro);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    //1.获取连接方法：通过数据库连接池获取连接
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }
    
    //2.释放资源
    public static void close(Statement stmt,Connection conn){
        /*if(stmt != null){
            try {
                stmt.close();//释放资源
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if(conn != null){
            try {
                conn.close();//归还连接
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }*/
        close(stmt,null,conn);
    }
    
    public static void close(Statement stmt, ResultSet rs,Connection conn){
        if(stmt != null){
            try {
                stmt.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if(conn != null){
            try {
                conn.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if(rs != null){
            try {
                rs.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
    }
    
    //3.获取连接池的方法
    public static DataSource getDataSource(){
        return ds;
    }
}

二、druid.properties文件配置

driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/girls
username=root
password=123456
	#初始化连接数量
initialSize=5
	#最大连接数
maxActive=10
	#最大等待时间
maxWait=3000

maxIdle=8
minIdle=3