java - 表单未提交 <s :select> 的选定值

Question

我有以下下拉列表，它正确显示了选项，但是当我选择一个项目并提交表单时，它会遇到以下错误:

'select', field 'list', name 'name': The requested list key 'listnames' could not be 
 resolved as a collection/array/map/enumeration/iterator type. Example: people or 
 people.{name} - [unknown location]

我的 JSP 表单

      <s:form method="POST" action="addNames">
            <s:select name="name"
                      label="Names"
                      list="listnames"
                      />
     </s:form>

我的行动

 @Action
 public class Myaction implements ModelDriven{
    private MyClass myclass = new MyClass();
    private List listnames = new ArrayList();

   @Override
   public MyClass getModel() {
      return this.myclass;
   }

  public List getListnames() {
     return listnames;
  }

  public void setListnames(List listnames) {
     this.listnames = listnames;
 } 


   public MyClass getMyClass() {
       return myclass;
 }

   public void setMyClass(MyClass myclass) {
       this.myClass = myclass;
   }
 }

我的类(class)

 public class MyClass {
   private String name;

   ..... getter and setters go here ....
 }

支柱

<package name="MyUsers" extends="default" namespace="/MyUsers">
        <action name="*" method="{1}" class="com.myproject.controller.Myaction">
            <result name="uAdd" type="tiles" >uAdd</result>
            <result name="uView" type="tiles" >uView</result>
        </action>
    </package>

Answer 1

第 1 步:确保 listnames 的 getter 和 setter 正确完成

第2步:确保您已正确完成listnames列表的声明和初始化

更新2 示例示例

struts.xml

<action name="getText" class="commonpackage.ReportsCommonClass" method="getText">
<result name="success">index.jsp</result>
</action>

<action name="myaction" class="commonpackage.ReportsCommonClass" method="myaction">
<result name="success">index2.jsp</result>
</action>

index.jsp

 <s:form id="conform" action="myaction" method="post">
 <label>NAME</label>
     <s:select id="name1" name="name1" list="mylist" headerKey="0" headerValue="--SELECT--"/>              

<s:submit value="Click" />  
 </s:form>

在 commonpackage.ReportsCommonClass 类中

ArrayList mylist=new ArrayList();

    public ArrayList getMylist() {
        return mylist;
    }

    public void setMylist(ArrayList mylist) {
        this.mylist = mylist;
    }

  public String getText()
  {
      mylist.add("NAME 1");
       mylist.add("NAME 2");
        mylist.add("NAME 3");
         mylist.add("NAME 4");
          mylist.add("NAME 5");
       return SUCCESS;
  }
  String name1;

    public String getName1() {
        return name1;
    }

    public void setName1(String name1) {
        this.name1 = name1;
    }


  public String myaction()
  {
       System.out.println("NAMEEEEEEEEEEEEEEEEEEEEE:"+name1);
       return SUCCESS;
  }