麻烦大家帮我看看什么问题啊为什么不能访问index.jsp啊？？？

type Exception reportmessage description 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)
cn.edu.bit.servlet.EncodingFilter.doFilter(EncodingFilter.java:66)
root cause java.lang.NullPointerException
org.apache.jsp.index_jsp._jspService(index_jsp.java:307)
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)
cn.edu.bit.servlet.EncodingFilter.doFilter(EncodingFilter.java:66)另外 EncodingFilter和index.jsp源代码如下：

解决方案 »

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package cn.edu.bit.servlet;import java.io.IOException;import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public class EncodingFilter implements Filter {

protected String encoding = null;
protected FilterConfig filterConfig = null;
protected boolean ignore = true; public void destroy() {
this.encoding = null;
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
if (ignore || (request.getCharacterEncoding() == null)) {
request.setCharacterEncoding(selectEncoding(request));
}
chain.doFilter(request, response);
}
public void init(FilterConfig filterConfig) throws ServletException { this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
String value = filterConfig.getInitParameter("ignore");
if (value == null)
this.ignore = true;
else if (value.equalsIgnoreCase("true")
|| value.equalsIgnoreCase("yes"))
this.ignore = true;
else
this.ignore = false;
} protected String selectEncoding(ServletRequest request) {
return (this.encoding);
} public FilterConfig getFilterConfig() {
return filterConfig;
} public void setFilterConfig(FilterConfig filterConfig) {
this.filterConfig = filterConfig;
}}
<%@ page contentType="text/html; charset=UTF-8" language="java"%>
<%@ page import="cn.edu.bit.business.*,java.util.*,cn.edu.bit.Object.*"%>
<%String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib uri="control" prefix="control"%>
<html>
<head>
<%String username = (String) request.getSession().getAttribute("username");
if (username == null || username.equals("")) {
// response.sendRedirect("login.jsp");
}
%>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>科研信息发布平台</title>
<style type="text/css">

</style>
</head> <body>
<table width="79%" border="1" align="center" cellpadding="0"
cellspacing="0">
<tr>
<td height="62" align="center">
<H1 align="center">
<FONT face="Arial Black" size="7">科研信息发布平台</FONT>
</H1>
</td>
</tr>
<tr>
<td>
   >>
<a href="index.jsp" target="_self">首页</a> |
<a href="news.jsp" target="_self">新闻</a> |
<a href="researchProject.jsp" target="_self">在研项目</a> |
<a href="production.jsp" target="_self">研究成果</a> |
<a href="teachers.jsp" target="_self">老师信息</a> |
<a href="members.jsp" target="_self">学生信息</a> |
<a href="down1.jsp" target="_self">课件下载</a> |
<a href="down2.jsp" target="_self">软件下载</a> |
<a href="reg.jsp" target="_self">用户注册</a>
</td>
</tr>
<tr>
<td height="329">
<table width="100%" height="100%" border="1" cellpadding="0"
cellspacing="0">
<tr>
<td width="112" valign="top">
<table width="88%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td valign="top">
<br>
<FORM name=memlogin action=login.jsp?action=login method=post>
<TABLE class=panel cellSpacing=0 cellPadding=4 width="85%"
border=1>
<TBODY>
<TR>
<TD class=panel-title>
<IMG height=18 src="images/front/user%20login.gif"
width=18 align=middle>
User Login
</TD>
</TR>
<TR class=panel-content>
<TD align=middle width="99%">
<TABLE cellSpacing=0 cellPadding=0 border=0>
<TBODY>
<TR>
<TD>
<IMG height="16" src="images/front/user.gif"
width="44">
</TD>
<TD background="images/button_01.gif" height=16>
<INPUT class=test id=username maxLength=10 size=8
name=username>
</TD>
</TR>
</TBODY>
</TABLE>
</TD>
</TR>
<TR class=panel-content>
<TD align=middle>
<TABLE cellSpacing=0 cellPadding=0 border=0>
<TBODY>
<TR>
<TD>
<IMG height=16 src="images/front/password.gif"
width=44>
</TD>
<TD background="images/button_01.gif">
<INPUT class=test id=Password2 type=password
maxLength=10 size=8 name=Password>
</TD>
</TR>
</TBODY>
</TABLE>
</TD>
</TR>
<TR class=panel-content>
<TD align=center>
<INPUT id=Login2 type=image height=16 alt=# width=50
src="images/front/button_login.gif" value=" Login "
name=Login>
</TD>
</TR>
</TBODY>
</TABLE>
</FORM>
<p>
 
</p>
<TABLE class=panel cellSpacing=0 cellPadding=2 width="100%"
border=1>
<TBODY>
<TR>
<TD class=panel-title>
<IMG height=20 src="images/front/createlink.gif" width=21
align=absMiddle>
<B>Links</B>
</TD>
</TR>
<TR>
<TD Align=center class=panel-content>
<p>
<SPAN style="WIDTH: 88px; HEIGHT: 43px"> <A
href="http://9stars.org/" target=_blank> <IMG
src="images/front/9stars.gif" alt=北理九星 width="100%"
height="31" border=0 align=absMiddle> </A> </SPAN>
<SPAN style="WIDTH: 88px; HEIGHT: 43px"> <A
href="http://www.bitunion.org/index.php" target=_blank>
<IMG src="images/front/bitunion.gif" alt=Ftp联盟
width="100%" height="31" border=0 align=absMiddle>
</A> </SPAN>
<SPAN style="WIDTH: 88px; HEIGHT: 43px"> <A
href="http://bbs.bitnp.net/" target=_blank> <IMG
src="images/front/bit3.gif" alt=网协论坛 width="100%"
height="31" border=0 align=absMiddle> </A> </SPAN>
<SPAN style="WIDTH: 88px; HEIGHT: 43px"> <A
href="http://www.bit.edu.cn" target=_blank> <IMG
src="images/front/sb.gif" alt=北京理工大学主页 width="100%"
height="33" border=0 align=absMiddle> </A> </SPAN>
</p>
</TD>
</TR>
<TR>
<TD vAlign=center class=panel-content>

<B> <A href="http://www.ssdl/links.jsp"> <IMG
align=absBottom border=0 height="14"
src="images/front/more.gif" width="14"> More
Links </A> <B> <A href="http://www.ssdl/links.jsp">
</A>
</B>
</B>
</TD>
</TR>
</TBODY>
</TABLE>
<p>
 
</p>
<table width="100%" border="1" cellspacing="0"
cellpadding="0">
<tr>
<td>
<span class="panel-title"><IMG height=18
src="images/front/contact.gif" width=18 align=absMiddle>
<STRONG>Contact Us</STRONG>
</span>
</td>
</tr>
<tr>
<td>
Email:
<br>
  admin@bit
</td>
</tr>
<tr>
<td>
MSN:
<br>
  admin@msn
</td>
</tr>
</table>
<p>
 
</p>
</td>
</tr>
</table>
</td>
<td width="532" valign="top">
<table width="100%" height="100%" border="1" cellpadding="0"
cellspacing="0">
<tr>
<td background="images/front/bg_1.gif">
新闻:
</td>
</tr>
<tr>
<td valign="top">
<control:news />
</td>
</tr>
<tr>
<td>
 
</td>
</tr>
<tr>
<td background="images/front/bg_1.gif">
在研项目:
</td>
</tr>
<tr>
<td valign="top">
<%
ArrayList pl = (ArrayList) Project_Manager.getProjectList();
%>
<div align="center">
<table width="100%" border="0" cellspacing="1"
cellpadding="1" class="tableBorder">
<%
Iterator iter = pl.iterator(); while (iter.hasNext()) {
Project pro = (Project) iter.next();
%>
<tr bgcolor="E4EDF9">
<td align="center" class="titleText">
<%=pro.getName()%>
</td>
<td>
 
</td>
</tr>
<tr bgcolor="F1F3F5">
<td width="20%" align="center" class="normalText">
起始时间:
</td>
<td width="80%" class="normalText">
<%=pro.getTime()%>
</td>
</tr>
<tr bgcolor="F1F3F5">
<td align="center" class="normalText">
简介:
</td>
<td class="normalText">
<%=pro.getInfo()%>
</td>
</tr>
<tr>
<td colspan="2">
 
</td>
</tr>
<%
}
%>
<tr>
<td colspan="2">
 
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
<td width="105" valign="top">
<br>
<table width="13%" border="1" cellspacing="0" cellpadding="0">
<tr>
<td>
<img height=19 src="images/front/works.JPG" width="100">
</td>
</tr>
<tr>
<td>
 
</td>
</tr>
<tr>
<td>
<A href="http://www.ssdl.com/view.asp?ID=01" target=_parent><IMG
border=0 height=100 src="images/front/24_330.gif" width=100>
</A>
</td>
</tr>
<tr>
<td>
<A href="index.jsp" target=_self><SPAN class=style4><STRONG><font
color="#355087">计算机围棋</font>
</STRONG>
</SPAN>
</A>
<SPAN class=top><STRONG>Client:</STRONG>
</SPAN><STRONG> </STRONG><SPAN class=t2>ssdl.com</SPAN>
<SPAN class=top><STRONG>Time:</STRONG>
</SPAN><STRONG> </STRONG><SPAN class=t2>2005-5-5</SPAN>
</td>
</tr>
<tr>
<td>
 
</td>
</tr>
<tr>
<td>
<A href="http://www.ssdl.com/view.jsp?logID=02"
target=_parent><IMG border=0 height=98
src="images/front/stop.gif" width=98>
</A>
</td>
</tr>
<tr>
<td>
<SPAN class="top "><STRONG><A
href="index.jsp" target=_self><FONT color=#355087>自然语言理解</FONT>
</A>
</STRONG>
</SPAN>
<SPAN class=top><STRONG>Client:</STRONG>
</SPAN><STRONG> </STRONG><SPAN class=t2>ssdl.com</SPAN>
<SPAN class=top><STRONG>Time:</STRONG>
</SPAN><SPAN class=t2>2005-5-5</SPAN>
</td>
</tr>
<tr>
<td>
 
</td>
</tr>
<tr>
<td> <A href="http://www.ssdl.com/view.jsp?logID=03"
target=_parent><IMG border=0 height=120
src="images/front/67017E7E54C3224BE4C5C538D7B268F7.GIF"
width=100>
</A>
</td>
</tr>
<tr>
<td>
<SPAN class="top "><STRONG><A
href="index.jsp" target=_self><FONT color=#355087>机器人</FONT>
</A>
</STRONG>
</SPAN>
<SPAN class=top><STRONG>Client:</STRONG>
</SPAN><STRONG> </STRONG><SPAN class=t2>ssdl.com</SPAN>
<SPAN class=top><STRONG>Time:</STRONG><SPAN class=t2>2005-5-5</SPAN>
</td>
</tr>
</table> </td>
</tr>
</table>
</td>
</tr>
<tr>
<td height="43">
<img height="57" src="images/front/footer.jpg" width="100%">
</td>
</tr>
</table>
</body>
</html>
你贴的代码对么？
cn.edu.bit.servlet.EncodingFilter.doFilter(EncodingFilter.java:66)
EncodingFilter有66行么？
你自己重新部署运行一下吧注意看看到底哪一行代码出了问题
空指针异常，问题不大，你应该调用了一个对象的方法，但是这个对象为null,没有赋值
呵呵问题解决了我把代码改成了
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
if (ignore || (request.getCharacterEncoding() == null)) {

request.setCharacterEncoding(getFilterConfig().getInitParameter("encoding"));
}
chain.doFilter(request, response);
}但我不知道为什么我原先的代码会出现空指针啊，那个encoding不是已经在init（）初始化了么？

麻烦大家帮我看看什么问题啊 为什么不能访问index.jsp啊？？？

解决方案 »

麻烦大家帮我看看什么问题啊为什么不能访问index.jsp啊？？？