IDEA imports the jdbc driver of MySQL "java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver"

table of Contents

1. General solution ideas

1. JDBC download link

2. Select the download content and download it

3. Import the driver into the java project

 2. What should I do if the driver still fails to be imported?

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When we use java to operate mysql database in idea, it will appear:

Exception in thread "main" java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at src.mySql.Jdbc.main(Jdbc.java:10)

1. General solution ideas

1. JDBC download link

• https://dev.mysql.com/downloads/connector/j/

2. Select the download content and download it

• Choose Platform Independent as the operating system, and the two records in the list below, the suffix tar.gz is the Linux version, and the .zip is the windows version.

　

 

• Download the windows version of the jdbc driver here, the version is 8.0.18

　　　　

 

• Skip to log in, just click the content in the red box to download

　　

 

3. Import the driver into the java project

• Click File-Project Structure in IDEA

 

• Module module, Dependencies tab

　　　　

 

• Click the plus sign (+) on the far right and select JARS or directories

　　　　

 2. What should I do if the driver still fails to be imported?

1. Click File-Project Structure in IDEA

 

2. Select SDKs, click the plus sign (+) on the far right, select the jdbc driver of the windows version we downloaded before , and then click OK to confirm

3. Finally, when we connect to the MYSQL database on IDEA , we can use this driver

example:

package src.mySql;

import java.sql.*;

public class Jdbc {
    public static void main(String[] args) throws Exception {
        Connection conn = null;
        try {
            // 加载驱动类
            Class.forName("com.mysql.cj.jdbc.Driver");
            long start = System.currentTimeMillis();

            // 建立连接
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb1",
                    "root", "root");
            long end = System.currentTimeMillis();
            System.out.println(conn);
            System.out.println("建立连接耗时： " + (end - start) + "ms 毫秒");

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }
}

result: 

Reference link:

IDEA imports the jdbc driver of MySQL and operates the database