Solution to the problem that Java cannot connect to MySQL 8.0

This article shares a collection of Java problems that cannot connect to MySQL 8.0 for your reference. The specific content is as follows

Question 1: Client does not support authentication protocol requested by Server;…

Question 2: Unknown initial character set index '255' received from server…

Question 3: MySQL 8.0 connection necessary URL statement

Problem 4: Duplicate method calls

Run Question 1 :

Solution: (note the semicolon in the 3 sentences, wy123456 is the password of my database)

Question 2:

Solution: (delete duplicate packages)

The import is also deleted, leaving only the correct one:

Then重啟eclipse! The environment will be updated~

Key: MySQL 8.0 needs to add this sentence : ?useSSL=false&serverTimezone=UTC

public static String dbUrl="jdbc:mysql://localhost:3306/websql?useSSL=false&serverTimezone=UTC"; 

Running results:

Question 4:

Solution: (The second connection name must be different)

Running results:

Attach the connection DbUtil class:

package com.cungudafa;

import java.sql.Connection;
import java.sql.DriverManager;

public class DbUtil {
  public static String dbUrl="jdbc:mysql://localhost:3306/websql?useSSL=false&serverTimezone=UTC";
  public static String dbUserName="root";
  public static String dbPassword="wy123456";
  public static String jdbcName="com.mysql.jdbc.Driver";

  public static Connection getCon() throws Exception {
   Class.forName(jdbcName);
   Connection con=DriverManager.getConnection(dbUrl,dbUserName,dbPassword);
    return con;
  }
  public static void closeCon(Connection con) {
    try {
      if (con != null) {
        con.close();
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.