Eclipse中利用JSP把mysql-connector-java-8.0.13.jar放到WebContent\WEB-INF\lib中连接MySQL数据库时Connection conn = DriverManager.getConnection(url,username,password)报错的解决办法

2022-05-31 13:49:14

开发环境：

　　1、系统：windows 7/8/10均可
　　2、jdk：1.8.0_144

　　3、服务器：apache-tomcat-9.0.8

　　4、IDE：eclipse+jsp

0、网页代码如下：

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>

<%@ page language="java" import="java.util.*"%>

<%@ page import="java.sql.*" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

    <title>小脚本测试</title>

    <meta name="website" content="http://www.crazyit.org" />

</head>

<body>

<%

// 注册数据库驱动
Class.forName("com.mysql.jdbc.Driver");
// 获取数据库连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/bookshop","root","123456");
// 创建Statement

Statement stmt = conn.createStatement();

// 执行查询

ResultSet rs = stmt.executeQuery("select * from news_inf");

%>

<table bgcolor="#ff0000" border="5" width="500">

<%

// 遍历结果集

while(rs.next())

{%>

    <tr>

        <!-- 输出结果集 -->

        <td><%=rs.getString(1)%></td>

        <td><%=rs.getString(2)%></td>

    </tr>

<%}%>

</table>

</body>

</html>

在jsp页面中把mysql-connector-java-8.0.13.jar放到WebContent\WEB-INF\lib中，再连接MySQL数据库时Connection conn = DriverManager.getConnection(url,username,password)报如下的错误：

Type Exception Report

Message An exception occurred processing [connDb.jsp] at line [15]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.apache.jasper.JasperException: An exception occurred processing [connDb.jsp] at line [15]

// 注册数据库驱动

Class.forName("com.mysql.jdbc.Driver");

// 获取数据库连接
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/bookshop","root","123456");//这句代码报错

// 创建Statement

Statement stmt = conn.createStatement();

Stacktrace:

    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:593)

    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:467)

    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)

    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)

    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)

    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

1解决办法：

1.1、将下载好的包添加进项目，操作如下：

这里我用的是eclipse，其他编译器导入方法自行搜索查询。
$Eclipse中利用JSP把mysql-connector-java-8.0.13.jar放到WebContent\WEB-INF\lib中连接MySQL数据库时Connection conn = DriverManager.getConnection(url,username,password)报错的解决办法$