java - 无法通过java应用程序连接到数据库mysql

Question

这是连接mysql数据库的简单代码，用户名和密码正确。 我无法连接到 mysql 数据库。 有什么建议吗？

package provaconnessionemysql;

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

public class connessionemysql {

    public static void main(String[] args) {

        System.out.println("inizio programma connessione mysql");

        try {Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/registropeso/" + "user=andrea&password=password");
            System.out.println("connessione aperta");
            conn.close(); // termino la connessione
            System.out.println("connessione chiusa");
        }

        catch(ClassNotFoundException e) {
            System.out.println(e);
            System.out.println("LocalizedMessage: " + e.getLocalizedMessage());
            System.out.println("Message: " + e.getMessage());
            System.out.println("Hashcode: " + e.hashCode());
            System.out.println("Cause: " + e.getCause());

        }
        catch(SQLException e) {
            System.out.println(e);
            System.out.println("SQLException: " + e.getMessage());
            System.out.println("SQLState: " + e.getSQLState());
            System.out.println("VendorError: " + e.getErrorCode());
        }
    }
}

Answer 1

getConnection() 方法已具有用户和密码参数。

getConnection(字符串 url, 字符串用户, 字符串密码)

分别指定即可。

连接 conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/registtropeso/","andrea","password");