【发布时间】：2018-07-01 09:05:21
【问题描述】：
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
* Servlet implementation class LoginChek
*/
@WebServlet("/LoginChek")
public class LoginChek extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public LoginChek() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String Uname=request.getParameter("Uname");
String password=request.getParameter("password");
try {
Class.forName("com.mysql.jdbc.driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost/3306/mydb","root","root");
Statement stmt =con.createStatement();
ResultSet rs=stmt.executeQuery("SELECT uname,upass FROM user_reg WHERE uname='"+Uname+"' and upass='"+password+"' ");
if(rs.next())
{
HttpSession session=request.getSession();
session.setAttribute("Uname", Uname);
response.sendRedirect("member.jsp");
}
else
{
response.sendRedirect("error.jsp");
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
doGet(request, response);
}}
**我正在使用 Eclicpse Photon 2018 年 6 月版以及最新版本的 MySQL。我已使用属性>Java 构建路径>库>添加外部 Jar 将“mysql-connector-java-8.0.11”添加到我的动态 Web 项目的库中。但是当我运行我的程序时出现“java.lang.ClassNotFoundException：com.mysql.jdbc.driver”错误。我是java新手，我该如何解决这个**
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