由於經常會連線資料庫，因此編寫了一個工具類，用到時只需要匯入即可使用。

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";


    //獲得與資料庫的連線
    public static  Connection getConnection(){
        Connection  conn = null;
        try {
            Class.forName(driver);//載入資料庫驅動
 

            //獲得連線  DriverManager
            conn = DriverManager.getConnection(url, userName, pass);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }

    //關閉資源
    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);
    }

}