我是MYSQL和JSP的新手。我正在尝试检查mysql数据库和jsp之间的连接。当我在服务器上运行项目时，它会抛出异常。我找不到代码上的错误。
我在mysql和UN上创建了oop数据库，PW也是正确的。
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Connection status </h1>
<%
/* Create string of connection url within specified format with machine name,
port number and database name. Here machine name id localhost and
database name is oop. */
String connectionURL = "jdbc:mysql://localhost:3306/oop";
// declare a connection by using Connection interface
Connection connection = null;
// Load JBBC driver "com.mysql.jdbc.Driver"
Class.forName("com.mysql.jdbc.Driver").getDeclaredConstructors();
/* Create a connection by using getConnection() method that takes parameters of
string type connection url, user name and password to connect to database. */
connection = DriverManager.getConnection(connectionURL, "root", "raviya");
// check weather connection is established or not by isClosed() method
if(!connection.isClosed()){
%>
<font size="+3" color="green">
<%
out.println("Successfully connected to " + "MySQL server using TCP/IP...");
connection.close();
}
else{
%>
</font>
<font size="+3" color="red">
<%
out.println("Unable to connect to database.");
}
%>
</font>
</body>
</html>
如果您不是导入mysql连接器jar文件，则可能会发生这些类型的错误。因此，您可以下载与您的版本相关的jar文件，并将其粘贴到您自己的项目/ WEB-INF / lib文件夹中。