请任何人救我的项目！ 我正在用JSP编写我的第一个真实/作业 - 项目，即我缺乏JSP经验，但具备该语言的基本知识。
我怀疑错误来自'J Connector'bcoz它缺少.jar扩展名，或问题是CLASSPATH或PATH或FILE PATH。
我创建了'form.jsp'＆amp; 'login.jsp page'＆amp; 'registration.jsp页面'。在测试时，我收到以下消息：
`HTTP Status 500 - An exception occurred processing JSP page /login.jsp at line 6
type Exception report
message An exception occurred processing JSP page /login.jsp at line 6
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /login.jsp at line 6
3: <%
4: String userid = request.getParameter("uname");
5: String pwd = request.getParameter("pass");
6: Class.forName("com.mysql.jdbc.Driver");
7: Connection con = DriverManager.getConnection
8: ("jdbc:mysql://localhost:3306/REG",
9: "root", "password");
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause
javax.servlet.ServletException: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:912)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:841)
org.apache.jsp.login_jsp._jspService(login_jsp.java:93)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:126)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:63)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:169)
org.apache.jsp.login_jsp._jspService(login_jsp.java:72)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.50 logs.
Apache Tomcat/7.0.50
`
form.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Login</title>
</head>
<body>
<form method="post" action="login.jsp">
<center>
<table border="1" width="30%" cellpadding="3">
<thead>
<tr>
<th colspan="2">Login Here</th>
</tr>
</thead>
<tbody>
<tr>
<td>User Name:</td>
<td><input type="text" name="uname" value="" /></td>
</tr>
<tr>
<td>Password:</td>
<td><input type="password" name="pass" value=""/></td>
</tr>
<tr>
<td><input type="submit" value="Login" /></td>
<td><input type="reset" value="Reset" /></td>
</tr>
<tr>
<td colspan="2">Yet Not Registered!!<a href="reg.jsp">Register Here</a> </td>
</tr>
</tbody>
</table>
</center>
</form>
</body>
</html>
的login.jsp
<%@ page import="java.io.*,java.util.*,java.sql.*" %>
<%@ page import="javax.servlet.http.*,javax.servlet.*"%>
<%
String userid = request.getParameter("uname");
String pwd = request.getParameter("pass");
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection
("jdbc:mysql://localhost:3306/REG",
"root", "password");
Statement st = con.createStatement();
ResultSet rs;
rs = st.executeQuery("select * from Members where uname='" + userid + "' and pass='" + pwd + "'");
if (rs.next()) {
session.setAttribute("userid", userid);
//out.println("Welcome" + userid);
//out.println("<a href='logout.jsp'>Log out</a>");
response.sendRedirect("Success.jsp");
} else {
out.println("Invalid password <a href='form.jsp'> try again </a>");
}
%>
database ='REG'table ='Members' * - mysql命令行。 *
CREATE TABLE Members (
id int(10) unsigned NOT NULL auto_increment,
firstName varchar(45) NOT NULL,
lastName varchar(45) NOT NULL,
email varchar(45) NOT NULL,
uname varchar(45) NOT NULL,
pass varchar(45) NOT NULL,
regdate date NOT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
JSP文件路径：C：\ Program Files \ Apache Software Foundation \ Tomcat 7.0 \ webapps \ ROOT
CLASSPATH：C：\ Program Files \ Apache Software Foundation \ Tomcat 7.0 \ lib \ jsp-api; C：\ Program Files \ Java \ jdk1.6.0_38 \ jre \ lib; C：\ Program Files \ MySQL \ MySQL Connector J \ mysql-connector-java-5.1.29-bin
路径：C：\ Program Files \ MySQL \ MySQL Server 5.2 \ bin; C：\ Program Files \ Java \ jdk1.6.0_38 \ bin
答案 0 :(得分：0)
您需要将MYSQL JDBC驱动程序添加到项目中。如果您正在使用netbeans，请单击项目上的右键 - > gt> properties-＆gt; Libraries-＆gt; Add Library，然后选择MYSQL JDBC Driver。问题解决了。