打开web页错误

[bing9902]

HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:500)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:413)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)


root cause

java.lang.NullPointerException
org.apache.jsp.login_jsp._jspService(login_jsp.java:72)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:371)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.35 logs.



怎么解决？

[三石-gary]

http://bbs.51testing.com/viewthread.php?tid=124237

[Acesidonu]

java.lang.NullPointerException
看看login页面

[bing9902]

<%@ page contentType="text/html;charset=gb2312" language="java"%>
<%@ page import="java.io.*,java.sql.*"%>
<jsp:useBean id="rst" scope="page" class="com.mingri.dbconn.DBResult"/>
<jsp:useBean id="calendar" scope="page" class="com.mingri.showtime.ShowTime"/>
<%
request.setCharacterEncoding("gb2312");//对请求进行统一编码，能正常接受到中文
String username=request.getParameter("username"); //接收表单中的username属性
String password=request.getParameter("password");//接收表单中的password属性
String str="select * from tb_user where "+
"username='"+username+"' and password='"+password+"'";
ResultSet rs=rst.getResult(str);//执行SQL语句获得结果集对象
session.setAttribute("isLog",new String("0"));//判断用户是否登陆，当isLog的属性为0时，说明用户并没有登陆
if(!rs.next())//结果集没有找到所要查找的行
{
out.println("<script language='javascript'>alert('用户名或密码错误');"+
"parent.location.href='login.html';</script>");
}
else
{
session.setAttribute("username",rs.getString("username"));//保存登录信息到session对象中
session.setAttribute("password",rs.getString("password"));
session.setAttribute("isLog",new String("1"));//将isLog属性设置为1
//获得用户上次登陆系统的时间
session.setAttribute("userLastLogTime",rs.getString("userLastLogTime"));
String strsql=calendar.getDate();
int id=rs.getInt("ID");
//将该用户本次登陆系统的时间在用户信息表中更新
String strUpdate="update tb_user set userLastLogTime='"+strsql+"' where ID="+id+"";
rst.getResult(strUpdate);//执行SQL语句
response.sendRedirect("chat.jsp");//登陆成功后转到系统主页面
}
%>

login页面代码