这是jsp界面的代码
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ page import="java.sql.*" %>
<%@ page language="java" %>
<%@ page import="java.util.*" %>
<%@ page import="controller.*" %>
<%@ page import= "utils.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path;
String applicationPath = basePath + "/" + "application";
%>
<jsp:useBean id="a" scope="page" class="utils.DbUtils"/>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312";>
<title>
change
</title>
</head>
<body bgcolor="#ffffff">
<%
String pwd="";
int uid = (Integer)session.getAttribute("uid");
String sql="";
sql="SELECT * FROM users where id="+uid;
ResultSet rs = a.executeQuery(sql);
if(rs.next()){
pwd=rs.getString("PASSW");
}
%>
<SCRIPT LANGUAGE="javascript" >
function checkform(){
if(form2.pwd1.value!="<%=pwd%>"||form2.pwd1.value=="")
{
alert("输入的原始密码不正确,请重新输入");
form2.pwd1.focus();
return false;
}
if(form2.pwd2.value=="")
{
alert("请输入新密码");
form2.pwd2.focus();
return false;
}
else if(form2.pwd2.value!=form2.pwd3.value)
{
alert("两次输入的新密码不同,请重新输入");
form2.pwd3.focus();
return false;
}
else
{
alert("密码修改成功");
return true;
}
return true;
}
</SCRIPT>
<link rel="stylesheet" type="text/css" media="all" href="<%=path%>/images/css1/ioa.css" />
<center>
<form action="update_pwd.jsp" method="POST" name="form2">
<table width="100%" border="0" cellspacing="0" cellpadding="0" class="pad5">
<tr>
<td valign="top" align="left" class="pad5">
<table width="100%" border="0" cellspacing="0" cellpadding="0" class="dqbg margb5">
<tr>
<td width="2%" align="right" class="pad05"><img src="<%=path%>/images/img2.gif" width="16" height="16"></td>
<td width="98%" align="left" class="lan13b">密码修改</td>
</tr>
</table>
<table width="100%" border="0" cellpadding="1" cellspacing="1" class="table-border margb5">
<tr>
<td width="14%" align="right" class="COLLECTION">请输入原密码:</td>
<td width="36%" align="left" class="even padl5"> <input type=password name="pwd1" maxlength="32"
onfocus="WdatePicker({readOnly:true})" /> </td>
</tr>
<tr>
<td width="14%" align="right" class="COLLECTION">请输入新密码:</td>
<td width="36%" align="left" class="even padl5"><input type=password name="pwd2" maxlength="32" class="inputnormal" value=""></td>
</tr>
<tr>
<td width="14%" align="right" class="COLLECTION">确认新密码:</td>
<td width="36%" align="left" class="even padl5"><input type=password name="pwd3" maxlength="32" class="inputnormal" value=""></td>
</tr>
</table>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="50%" align="right" class="padr5"><input type="submit" onclick="javascript:return(checkform());" name="button" value="保 存" class="button"></td>
<td width="50%" align="left" class="padl5"><input name="button1" type="button" class="button" onClick="history.go(-1);" value="返 回"></td>
</tr>
</table>
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
下面的错误提示:
type Exception report
message An exception occurred processing JSP page /pwd.jsp at line 25
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /pwd.jsp at line 25
22:
23: <%
24: String pwd="";
25: int uid = (Integer)session.getAttribute("uid");
26:
27: String sql="";
28: sql="SELECT * FROM users where id="+uid;
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:579)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NullPointerException
org.apache.jsp.pwd_jsp._jspService(pwd_jsp.java:150)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.39 logs.