“Select” not populated from List in struts

问题

I have the following sources:

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

    <constant name="struts.enable.DynamicMethodInvocation" value="true" />
    <constant name="struts.devMode" value="true" />
    <constant name="struts.custom.i18n.resources" value="ApplicationResources" />

    <package name="vislabWebShop" extends="struts-default">

        <action name="UserForward">
            <result>/pages/Login.jsp</result>
        </action>

        <action name="UserLogin" class="vislabWebShop.controller.LoginAction">
            <result name="success">/pages/Welcome.jsp</result>
            <result name="input">/pages/Login.jsp</result>
        </action>

        <action name="UserRegister" class="vislabWebShop.controller.RegisterAction">
            <result name="success">/pages/RegisterSuccess.jsp</result>
            <result name="input">/pages/Register.jsp</result>
        </action>

        <action name="UserRegisterNew">
            <result>/pages/Register.jsp</result>
        </action>

        <action name="UserRegisterSuccess">
            <result>/pages/Login.jsp</result>
        </action>

        <action name="ProductSearchForward">
            <result>/pages/SearchProduct.jsp</result>
        </action>

        <action name="ProductSearch" class="vislabWebShop.controller.ProductSearchAction">
            <result name="success">/pages/Login.jsp</result>
        </action>
    </package>
</struts>

ProductSearchAction.java:

package vislabWebShop.controller;

import java.util.ArrayList;
import java.util.List;

import com.opensymphony.xwork2.ActionSupport;

public class ProductSearchAction extends ActionSupport
{
  private List<String> categories;
  private String chosenCategory;

  public ProductSearchAction()
  {
    categories = new ArrayList<String>();
    categories.add("Eins");
    categories.add("Zwei");
    categories.add("Drei");
  }

  @Override
  public String execute() throws Exception
  {
    return SUCCESS;
  }

  public List<String> getCategories()
  {
    return categories;
  }

  public void setCategories(List<String> categories)
  {
    this.categories = categories;
  }

  public String getChosenCategory()
  {
    return chosenCategory;
  }

  public void setChosenCategory(String chosenCategory)
  {
    this.chosenCategory = chosenCategory;
  }
}

SearchProduct.jsp:

    <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
        pageEncoding="ISO-8859-1"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <%@ taglib prefix="s" uri="/struts-tags"%>

    <html>
    <head>
    <title><s:text name="welcome.title" /></title>
    </head>

    <body bgcolor="white">

        <font color="red"> <s:actionmessage />
        </font>

    <p>
        <b><s:text name="product.search.title" /></b>
    </p>

    <s:form action="ProductSearch" focusElement="description">
        <s:textfield name="description" key="prompt.description" size="20" />
        <s:textfield name="minprice" key="prompt.price.min" size="20" />
        <s:textfield name="maxprice" key="prompt.price.max" size="20" />
        <s:select key="product.search.category" headerKey="-1" 
        headerValue="Bitte wählen Sie eine Kategorie"
            list="categories" />
        <s:submit value="Produkt suchen" align="right" />
    </s:form>

    <font color="red"> <s:actionerror label="label" />
    </font>


</body>
</html>

Now I have the problem, that I always get the following error if I come from Action ProductSearchForward to the JSP site SearchProduct.jsp:

org.apache.jasper.JasperException: tag 'select', field 'list', name 'product.search.category': The requested list key 'categories' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]

I just want the DropDownList to be populated from the given ArrayList<String> (List<String>), but it is not working. If I set the list content directly it works fine.

回答1:

<s:select list = "categories" 
           key = "product.search.category" />

You are listing a List<String> and trying to access, through OGNL . (dot notation), fields that do not exist.

In OGNL

product.search.category

is the equivalent of Java

getProduct().getSearch().getCategory()

Since you are listing Strings, just omit key attribute, because both your key and value will be the String itself.

It seems that you are confusing key with name too: key is the key of the <option> element, while name is the Action's attribute that will receive the chosen value through its Setter.

<s:select list = "categories" 
          name = "chosenCategory" />

EDIT: for a succesful living, implement Preparable Interface and load there your "static" data:

public class ProductSearchAction extends ActionSupport implements Preparable {
    private List<String> categories;
    private String chosenCategory;

    @override
    public void prepare() throws Exception {      
        categories = new ArrayList<String>();
        categories.add("Eins");
        categories.add("Zwei");
        categories.add("Drei");
    }

    @Override
    public String execute() throws Exception {
        return SUCCESS;
    }

    /* GETTERS AND SETTERS */
}

And you must specify fully qualified class names for each tag in struts.xml...

来源：https://stackoverflow.com/questions/20521086/select-not-populated-from-liststring-in-struts

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