JSP提交验证好难啊
我用的是SQL数据库
写了一个UserMan.java的文件内容是
package kernel;
import java.sql.*;
public class UserMan{
private String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=sqldata;user=sa;password=520";
public UserMan(){
try{
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
}
catch (Exception ex){
ex.printStackTrace();
}
}
public boolean userExist(String userID){
Connection con=null;
PreparedStatement ps=null;
ResultSet rs=null;
boolean exist=true;
try{
con=DriverManager.getConnection(url);
String selectStr="select * from userat where name=?";
ps=con.prepareStatement(selectStr);
ps.setString(1, userID);
rs=ps.executeQuery();
if (!rs.next())
exist=false;
}
catch(SQLException exc){
exc.printStackTrace();
}
finally{
if (rs!=null) try {rs.close();} catch (SQLException ignore){}
if (ps!=null) try {ps.close();} catch (SQLException ignore){}
if (con!=null) try {con.close();} catch (SQLException ignore){}
}
return exist;
}
}
然后建了一个default.htm的文件做为登录提交的,代码是
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<body>
<form name="form1" method="post" action="login.jsp">
<input name="names" type="text" id="names">
<input type="submit" name="Submit" value="提交">
</form>
</body>
</html>
来了个验证login.jsp,代码是
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="UserMan" scope="page" class="kernel.UserMan"></jsp:useBean>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<body>
<%
String username=request.getParameter("names");
if (!UserMan.userExist(username))
{
out.print("error!!");
}
else{
out.print("ok!!!");
}
%>
</body>
</html>
出现错误
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: kernel/UserMan (Unsupported major.minor version 49.0)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:244)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
看不明白是什么错误