java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)

java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO) 的错误提示表明用户访问被拒绝，原因是没有使用数据库密码进行连接。这个错误通常发生在使用JDBC连接数据库时，getConnection()方法的参数传递错误。在您的情况中，错误是因为在调用DriverManager.getConnection(url)方法时，忘记传递正确的用户名和密码参数。正确的使用getConnection()方法应该是：DriverManager.getConnection(url, user, password)。

解决这个问题的办法就是使用正确的getConnection()方法，传递正确的用户名和密码参数。通过仔细检查代码，确保变量名与配置文件中的变量名一致，以及在获取数据库配置文件中的变量时没有出现错误。这样就能解决这个问题了。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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