请问大家这个什么错误啊！！！
<%@ 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
[解决办法]
up
[解决办法]
NullPointerException 空指針異常
調試一下你的name和password有沒有值
[解决办法]
<%@ 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>
<%
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
[解决办法]
你没有判断name属性。所以程序不会去管。他只执行代码块中的能执行部分。
[解决办法]
你应该给name 和password 赋初值
