Custom struts tags can accept a List list parameter of the bean

wkqq2004

I wrote a custom struts tag,
/ *
 * Created on 2017-1-4
 *
 * TODO To change the template for this generated file, go to
 * Window-Preferences-Java-Code Style-Code Template
 * /
package com.yourcompany.struts.operation;
import javax.servlet. *;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext. *;
import java.util. *;

/ **
 * @author xm
 *
 * TODO To change the template of this generated type annotation, go to
 * Window-Preferences-Java-Code Style-Code Template
 * /
public class RadioListTag extends TagSupport {
    List list = null;
    public int doStartTag () {
    //list=(List)pageContext.getAttribute("admin ");
    Ranch
         JspWriter out = pageContext.getOut ();
         int counter = 1;
         if (list.size ()> 0)
         try {
         out.print ("<table border = 0 widht = 100% height = 100%> <tr>");
         for (Iterator it = list.iterator (); it.hasNext ();) {
         Ranch
         Ranch
         String value = (String) it.next ();
         out.print ("<td align = 'left'> <input type = 'radio' name = 'admin' value = '" + value + "'>" + value + "</ radio> </ td>");
         if (it.hasNext ()) {
         value = (String) it.next ();
         if (value == "彭 Liping1")
         out.print ("<td align = 'left'> <input type = 'radio' name = 'admin' checked = 'checked' value = '" + value + "'>" + value + "</ radio> </ td > </ tr> ");
         else
         out.print ("<td align = 'left'> <input type = 'radio' name = 'admin' value = '" + value + "'>" + value + "</ radio> </ td> </ tr> ");
         }
         else {
         out.print ("<td> </ td> </ tr>");
         }
         Ranch
             }
            out.print ("</ table>");
         } catch (Exception e) {
         e.printStackTrace ();
         }
    return EVAL_BODY_INCLUDE;
    }
}
Let the tag name be <jeffy: Radio> </ jeffy: Radio> I want to have a java bean on the page and have a List property. How do I pass this property to <jeffy: Radio> </ jeffy: Radio>

wkqq2004

One of the solutions:
  
           allowable
               JspWriter out=pageContext.getOut(); add a code before
               List list=(List)HttpServletRequest.getAttribute("list");
           In this way, there is no need to pass parameters or anything!
    End this question here

spaniel

Halo, refer to other tag codes, vaguely remember that it seems to add a few attributes to the tag class, and it must conform to the javabean specification

vg2321vbcj

JspWriter out=pageContext.getOut(); add a code before
List list=(List)HttpServletRequest.getAttribute("list");
-------------------------------------------------- ------
The parameters passed in the request cannot be List, only strings or arrays, so the conclusion is not true!

wkqq2004

JspWriter out=pageContext.getOut(); add a code before
List list=(List)HttpServletRequest.getAttribute("list");
-------------------------------------------------- ------
The parameters passed in the request cannot be List, only strings or arrays, so the conclusion is not true!

Then use array directly, or convert list to array to do it,
I didn’t experiment, I only thought of the principle.

tellyou

if(value=="彭丽萍1") // equals

Then the tags are actually JavaBeans,

<xxx:yyy zzz="abc" />

Is actually similar
tag = new xxx.Yyy();
tag.setZzz("abc");

tellyou

If you want List

Is <xxx:yyy list="<%= yourList %>" />