form提交给自己的问题，急

Question

如果要提交到本页面
action缺省就行了

Answer 1

<A HREF="<%=urlstr+"cpage_n=1"%>">首页</a>这样就可以了~！看来看去不知道你在问什么问题~！

Answer 2

form 的action缺省还是nullPointerException的问题。实在不知道代码那里会有问题
exception org.apache.jasper.JasperException
org.apache.jasper.runtime.JspRuntimeLibrary.internalIntrospecthelper(JspRuntimeLibrary.java:405)
org.apache.jasper.runtime.JspRuntimeLibrary.introspecthelper(JspRuntimeLibrary.java:352)
org.apache.jasper.runtime.JspRuntimeLibrary.introspect(JspRuntimeLibrary.java:330)
org.apache.jsp.usercx_jsp._jspService(usercx_jsp.java:53)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause java.lang.NullPointerException
org.apache.jasper.runtime.JspRuntimeLibrary.internalIntrospecthelper(JspRuntimeLibrary.java:366)
org.apache.jasper.runtime.JspRuntimeLibrary.introspecthelper(JspRuntimeLibrary.java:352)
org.apache.jasper.runtime.JspRuntimeLibrary.introspect(JspRuntimeLibrary.java:330)
org.apache.jsp.usercx_jsp._jspService(usercx_jsp.java:53)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

Answer 3

<%
   String currentPage="1";
   if(request.getParameter("cpage_n")!=null)
       currentPage=request.getParameter("cpage_n");%>
<form name="addrole" action="?cpage_n=<%=currentPage%>" method="POST"></form>
<A HREF="?cpage_n=1">首页</a>