javaweb连接数据库

编程步骤：
1>导包 mysql-connector-java-8.0.15.jar（构建路径）
2>JDBC编程
A. 加载驱动private static String driver = “com.mysql.cj.jdbc.Driver”;
B. 获得连接Private static String url=“jdbc:mysql://localhost:3306/jdbc?useSSL=false&serverTimezone=UTC”;
C. 获得执行语句对象
D. 执行SQL语句
E. 处理结果集
F. 关闭连接

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBCdemo {
 //连接数据库的启动类
 private static String driver = "com.mysql.cj.jdbc.Driver";
 //连接数据库的协议
 private static String url="jdbc:mysql://localhost:3306/jdbc?useSSL=false&serverTimezone=UTC";
 
 //连接数据库的账号和密码
 private static String uername="root";
 private static String password="123456";
 public static void main(String[] args) {
  //a.加载驱动
  try {
   Class.forName(driver);
   //b.获取连接
   Connection conn = DriverManager.getConnection(url, uername, password);
   //c.获得执行语句对象
   Statement state = conn.createStatement();
   //执行SQL语句
   String sql = "select * from stu where id=1";
   ResultSet rs = state.executeQuery(sql);
   //处理结果集
   while(rs.next()) {
    System.out.println(rs.getString("name"));
    System.out.println(rs.getString("password"));
    
   }
   //关闭连接
   rs.close();
   state.close();
   conn.close();
  } catch (ClassNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  
 }
}

注：localhost:3306/jdbc? / 后为数据库的名称