连接数据库Jdbc工具类

由于经常会连接数据库，因此编写了一个工具类，用到时只需要导入即可使用。

package com.guigu.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JdbcUtil {

private static String userName ="root" ;
private static String pass ="root";
private static String url ="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8";
private static String driver ="com.mysql.jdbc.Driver";


//获得与数据库的连接
public static  Connection getConnection(){
        Connection  conn = null;
try {
            Class.forName(driver);//加载数据库驱动
//获得连接 DriverManager
            conn = DriverManager.getConnection(url, userName, pass);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
return conn;
    }

//关闭资源
public static void closeConn(Connection conn,Statement st,ResultSet rest){
if(rest != null){
try {
                rest.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

if(st != null){
try {
                st.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

if(conn != null){
try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }
public static void main(String[] args) {
        Connection conn=getConnection();
        System.out.println(conn);
    }

}