IDEA配置连接MYSQL数据库遇到Failed这个问题解决

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

public class Example11_1 {
 public static void main(String args[]) {
  Connection con = null;
  Statement sql;
  ResultSet rs;
  try {
   Class.forName("com.mysql.jdbc.Driver"); //加载JDBC_MySQL驱动
  } catch (Exception e) {
  }
  String uri = "jdbc:mysql://localhost:3306/jdbc";
  String user = "root";
  String password = "********";
  try {
   con = DriverManager.getConnection(uri, user, password); //连接代码
  } catch (Exception e) {
  }
  try {
   sql = con.createStatement();
   rs = sql.executeQuery("SELECT * FROM mess"); //查询mess表
  } catch (Exception e) {
   System.out.println(e);
  }finally {
   //con.close();
  }
 }
}