<%@ page contentType="text/html; charset=GBK" %>
<html>
<head>
<title>
df
</title>
</head>
<body bgcolor="#ffffff">
<form action="df.jsp" method="post" name="form">
用户名<input type="text" name="name"><br />
密码<input type="password" name="password"><br />
<center >
<input type="submit" name="submit" value="验证"/></center>
</form>
<%String name=request.getParameter("name");
String password=request.getParameter("password");
if(password.equals("go")){
session.setAttribute("name","ok");
session.setAttribute("mess","你好,你已经验证成功"); }else{session.setAttribute("name","no");
session.setAttribute("mess","qing chong denglu ");}
response.sendRedirect("2.jsp");%>
</body>
</html>
rg.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.df_jsp._jspService(df_jsp.java:58)
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 ca
<html>
<head>
<title>
df
</title>
</head>
<body bgcolor="#ffffff">
<form action="df.jsp" method="post" name="form">
用户名<input type="text" name="name"><br />
密码<input type="password" name="password"><br />
<center >
<input type="submit" name="submit" value="验证"/></center>
</form>
<%String name=request.getParameter("name");
String password=request.getParameter("password");
if(password.equals("go")){
session.setAttribute("name","ok");
session.setAttribute("mess","你好,你已经验证成功"); }else{session.setAttribute("name","no");
session.setAttribute("mess","qing chong denglu ");}
response.sendRedirect("2.jsp");%>
</body>
</html>
rg.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.df_jsp._jspService(df_jsp.java:58)
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 ca
<html>
<head>
<title>
df
</title>
</head>
<body bgcolor="#ffffff">
<form action="df.jsp" method="post" name="form">
用户名<input type="text" name="name"><br />
密码<input type="password" name="password"><br />
<center >
<input type="submit" name="submit" value="验证"/></center>
</form>
<%
if(request.getParameter("name")!=null&&request.getParameter("password")!=null)
{
String name=request.getParameter("name");
String password=request.getParameter("password");
if(password.equals("go"))
{
session.setAttribute("name","ok");
session.setAttribute("mess","你好,你已经验证成功"); }
else
{
session.setAttribute("name","no");
session.setAttribute("mess","qing chong denglu "); }
response.sendRedirect("2.jsp");
}
%>
</body>
</html>
==============================================
因为开始的时候name和password都是null
go就能登陆,那name不是为空了吗,而且我也能正常运行,有点矛盾,请大家指点一下