在IDEA的maven项目中连接并使用MySQL8.0的方法教程

<dependency>
 <groupId>org.dom4j</groupId>
 <artifactId>dom4j</artifactId>
 <version>2.1.1</version>
</dependency>

<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>8.0.13</version>
  <scope>runtime</scope>
</dependency>

<?xml version='1.0' encoding='UTF-8'?>
<accounts>
  <account>
    <url>jdbc:mysql://localhost:3306/mybase?useSSL=false&amp;serverTimezone=CTT</url>
    <user>root</user>
    <password>123456</password>
  </account>
</accounts>

package com.langsin.jdbcutil;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import java.sql.*;

public class JDBCUtils {
 private JDBCUtils {}
 private static Connection con;

 static {
  try {
   //初始化MySQL的Driver类
   Class.forName("com.mysql.cj.jdbc.Driver");
   //通过dom4j得到xml文件中连接数据库的信息
   SAXReader reader = new SAXReader();
   Document doc = reader.read("src/JDBC.xml");
   Element root = doc.getRootElement();
   Element ele = root.element("account");
   String url = ele.element("url");
   String user = ele.element("user");
   String password = ele.element("password");
   //连接数据库
   con = DriverManager.getConnection(url, user, password);
  } catch(Exception e) {
   throw new RuntimeException(e + ",数据库连接失败！");
  }
 }

 public static Connection getConnection() {
  return con;
 }

 public static void close(Connection con, Statement state) {
  if(con != null) {
   try {
    con.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }
  if(state != null) {
   try {
    state.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }
 }

 public static void close(Connection con, Statement state, ResultSet rs) {
  if(con != null) {
   try {
    con.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }
  if(state != null) {
   try {
    state.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }  
  if(rs != null) {
   try {
    rs.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }
 }
}
package com.langsin.jdbcutil;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class TestJDBCUtils {
 public static void main(String[] args) {
  Connection con = JDBCUtils.getConnection();
  String sql = "SELECT * FROM sort";
  //创建PreparedStatement对象，并将sql语句发送到数据库
  PreparedStatement pst = con.prepareStatement(sql);
  //取得执行后的结果集
  ResultSet rs = pst.executeQuery();
  //输出sort表中第二列的所有数据
  while(rs.next()) {
   System.out.println(rs.getString(2));
  }
  JDBCUtils.close(con, pst, rs);
 }
}