一个jsp问题！！令人头疼
登入JSP页面，总是提示错误如下！
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
decription The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.bjsxt.shopping.util.filter.IPFilter.doFilter(IPFilter.java:31)
root cause
java.lang.NullPointerException
com.bjsxt.shopping.user.User.check(User.java:200)
org.apache.jsp.Login_jsp._jspService(Login_jsp.java:63)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.bjsxt
相关问答：
我是用STRUTS ，做了一个JSP页面，提交后没有存入数据库。
JSP代码如下：
aa.jsp代码
<%@ page contentType="text/html;charset=gb2312" language="java"%>
<%@ taglib uri=" ......
<%@page language="java" contentType="text/html;charset=gb2312" import="java.sql.*"%>
<jsp:useBean id="db" class="wang.connectDB"/>
< ......
jsp中include.inc的作用是什么？
include.inc啥意思？没听说过
Java code:
<%include file="include.inc"%>加载网站目录include.inc文件内容
包含一个静态页面吧···
& ......
<html><head><title>[@title]</title>
<meta http-equiv=Content-Type content="text/html; charset=gb2312">
<script language='javascript'>
function diyCheck ......
我是个新手，做一个JSP网页，我要读出数据库正常，但是我要修改的时候，也就是读入的时候出现乱码，请高手告诉我怎么解决，先谢谢了。
request.setCharacterEncoding("UTF-8");
把编码统一
/**
......
