逃家小兔绘本故事内容:高手帮忙:一个小程序的错误

来源：百度文库编辑：高校问答时间：2024/05/03 04:06:15

<html>
<title>会员登录</title>
<%@page contentType="text/html;charset=gb2312"%>
<body>
<font size=5 color=green>登录画面</font>
<font color=red>
<%
String errmsg=new String(request.getParameter("errmsg").getBytes("ISO-8859-1"),"GBK");
if(errmsg!=null)
{
out.print(errmsg);
}
%>
</font>
<hr>
<form action=cookiedenglu1.jsp method=POST>
<table border=0>
<tr><td>姓名:</td><td><input type=text size=20 name=name></td>
<td><input type=submit name="提交" value="登录"></td></tr>
</table>
</form>
<a href="cookiedenglu2.jsp">会员专属网页</a>
</body>
</html>
提示出错
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.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.cookiedenglu_jsp._jspService(cookiedenglu_jsp.java:50)
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/5.0.30 logs.
错误反应在程序里是这行:String errmsg=new String(request.getParameter("errmsg").getBytes("ISO-8859-1"),"GBK");
可是这一行哪错了,我是想用它来实现response.sendRedirect()里的中文参数的

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