急:分少点 老问题 关于<html:select>帮忙解决下高手门,

Question

<html:select name="category" property="categoryId">  
    <html:optionsCollection  name="catList" label="name" value="id" />  
</html:select> 那from里面应该怎么定义 action如何让select里获得数据 哎我搞了一天了 都不对, 希望指点下,

Answer 1

private ArrayList catList;
给这个赋值的时候需要这样写：
catList.add(new LableValueBean(key,value));然后就可以读取出来了，如果偶没记错的话

Answer 2

那在from应该定义几个BEAN

Answer 3

private ArrayList catList;
categoryId上面两个写在form里catList.add(new LableValueBean(key,value));
这个写在action里，需要多少写多少啊

Answer 4

我想问下如果<html:optionsCollection  property="这里的名字随便起把" name="catList" label="name" value="id" />   那是不是在from在定义一个

Answer 5

报错javax.servlet.ServletException: Failed to obtain specified collection
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.uselogin_jsp._jspService(uselogin_jsp.java:97)
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)
root cause javax.servlet.jsp.JspException: Failed to obtain specified collection
org.apache.struts.taglib.html.OptionsCollectionTag.doStartTag(OptionsCollectionTag.java:176)
org.apache.jsp.uselogin_jsp._jspx_meth_html_optionsCollection_0(uselogin_jsp.java:194)
org.apache.jsp.uselogin_jsp._jspx_meth_html_select_0(uselogin_jsp.java:165)
org.apache.jsp.uselogin_jsp._jspx_meth_html_form_0(uselogin_jsp.java:119)
org.apache.jsp.uselogin_jsp._jspService(uselogin_jsp.java:86)
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)

Answer 6

哪里写错了
JSP:<html:select name = "gatewayListForm" property = "gatewayId">
<html:optionsCollection property="gatewayList"  label="name"value="id" /></html:select>
from: private ArrayList gatewayList;
private String gatewayId; 的get/set  方法   
action:
ArrayList gateways = new ArrayList();
for(int i =0;i<gateways.size();i++)
{
gateways.add(new LabelValueBean("value1","value01"));
gateways.add(new LabelValueBean("value2","value02"));
}

request.setAttribute("gatewayList", gateways);  
return mapping.findForward("success.jsp");