伙计只剩下9分了,各位帮帮忙!
使用 jdk1.4.2 + tomcat5.0 + mysql5.0 + eclipse3.01
做了一个前台显示查询结果的页面,使用servlet 转到jsp页面后出错,错误提示如下:type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
org.apache.jsp.admin_jsp._jspService(admin_jsp.java:72)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logsjsp显示页面的代码如下:
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.util.*,com.*" errorPage="" %><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
<!--
.STYLE2 {font-size: 12px}
-->
</style>
</head><body>
<jsp:useBean id = "BbsBean" scope="page"
class="com.BbsBean"/><%
ArrayList list = new ArrayList();list = (ArrayList)request.getAttribute("list");
int n = list.size();
%>
<form id="form1" name="form1" method="post" action="../servlet/Del">
<%
for(int i=0; i<n;i++){
BbsBean bean = (BbsBean)list.get(i);
String id = bean.getId();
String title = bean.getTitle();
%>
<table width="476" border="0" align="center" cellpadding="0" cellspacing="0" bordercolor="#CCCCCC" bgcolor="#CCCCCC" >
<tr>
<td width="397"><span class="STYLE2">
<input type="checkbox" name="msg" value="<%=id%>" />
<%=title%>
</span></td>
</tr>
<tr>
<td><div align="center">
</div></td>
</tr>
</table>
<div align="center">
<%
}
%>
<input type="submit" name="Submit" value="删除" />
</div>
</form>
<form name="form2" method="post" action="">
<span class="STYLE2" align="right">
<label>
<input type="submit" name="Submit2" value="退出" onClick="fit()">
</label>
</span>
</form>
<p> </p>
</body>
</html>大家帮忙看看是那错了呢?
使用 jdk1.4.2 + tomcat5.0 + mysql5.0 + eclipse3.01
做了一个前台显示查询结果的页面,使用servlet 转到jsp页面后出错,错误提示如下:type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
org.apache.jsp.admin_jsp._jspService(admin_jsp.java:72)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logsjsp显示页面的代码如下:
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.util.*,com.*" errorPage="" %><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
<!--
.STYLE2 {font-size: 12px}
-->
</style>
</head><body>
<jsp:useBean id = "BbsBean" scope="page"
class="com.BbsBean"/><%
ArrayList list = new ArrayList();list = (ArrayList)request.getAttribute("list");
int n = list.size();
%>
<form id="form1" name="form1" method="post" action="../servlet/Del">
<%
for(int i=0; i<n;i++){
BbsBean bean = (BbsBean)list.get(i);
String id = bean.getId();
String title = bean.getTitle();
%>
<table width="476" border="0" align="center" cellpadding="0" cellspacing="0" bordercolor="#CCCCCC" bgcolor="#CCCCCC" >
<tr>
<td width="397"><span class="STYLE2">
<input type="checkbox" name="msg" value="<%=id%>" />
<%=title%>
</span></td>
</tr>
<tr>
<td><div align="center">
</div></td>
</tr>
</table>
<div align="center">
<%
}
%>
<input type="submit" name="Submit" value="删除" />
</div>
</form>
<form name="form2" method="post" action="">
<span class="STYLE2" align="right">
<label>
<input type="submit" name="Submit2" value="退出" onClick="fit()">
</label>
</span>
</form>
<p> </p>
</body>
</html>大家帮忙看看是那错了呢?
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看看list 里面的对象是不是null啊?
class="com.BbsBean"/>
感觉这句有问题list = (ArrayList)request.getAttribute("list");
int n = list.size();我觉得应该改成list = (ArrayList)request.getAttribute("list");
if(list==null)
{
list=new ArrayList();
}
int n = list.size();这样防下空指针
import com.runze.*;
import java.util.*;import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/*
* Created on 2006-10-17
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*//**
* @author Administrator
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class quer extends HttpServlet { public void init(ServletConfig config) throws ServletException {
super.init(config);
} protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
query query = new query();
ArrayList list = new ArrayList();
list = query.list();
req.setAttribute("list",list);
res.sendRedirect("../index.jsp");
}
}javaBean代码:
package com.runze;import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import com.*;public class query {
public ArrayList list() {
String sql = "select * from neirong"; ArrayList list = new ArrayList(); Conn conn = new Conn(); ResultSet rs = conn.executeQuery(sql); try {
while (rs.next()) {
BbsBean bbsBean=new BbsBean();
bbsBean.setId(rs.getString(2));
bbsBean.setTitle(rs.getString(3));
bbsBean.setContent(rs.getString(4));
list.add(bbsBean); }
} catch (SQLException e) { e.printStackTrace();
}
return list;
}}