package com.ke.struts.bean;

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

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;

public class ActionForm extends ActionForm {

 private List<String> friends = new ArrayList<String>();
 private static String[] skillLevels = new String[]{"Beginner","Intermediate","Advanced"};
 private Map<String,Object> skills = new HashMap<String,Object>();
 

public ActionErrors validate(ActionMapping mapping,
   HttpServletRequest request) {
  // TODO Auto-generated method stub
  return null;
 }
 public void reset(ActionMapping mapping, HttpServletRequest request) {

  this.friends.clear();
 }
 public Object getSkill(String key)
 {
  return skills.get(key);
 }
 public void setSkill(String key,Object value)
 {
  skills.put(key, value);
 }
 public Map getSkills()
 {
  return skills ;
 }
 public String[] getSkillLevels()
 {
  return skillLevels;
 }
 public List<String> getFriends() {
  return friends;
 }

 public void setFriends(List<String> friends) {
  this.friends = friends;
 }
 
 public void setFriend(int index,String friend)
 {
  if(this.friends.size() > index)
  {
   /*用指定的元素替代此列表中指定位置上的元素*/
   this.friends.set(index, friend);
  }
  else
  {
   while(this.friends.size() < index)
   {
    this.friends.add(null);
   }
   this.friends.add(index, friend);
  }
 }
 
 public String getFriend(int index)
 {
  if(this.friends.size() > index)
  {
   return (String)this.friends.get(index);
  }
  else
  {
   return null ;
  }
 }
}
輸入頁面
     Friend 1 :<html:text property="friend[0]"></html:text><br>   <!-- 調用setFriend(int index,String friend)-->
     Friend 2 :<html:text property="friend[1]"></html:text><br>
     Friend 3 :<html:text property="friend[2]"></html:text><br>
java skill: <html:select property="skill(java)">   <!-- 調用setSkill(String key,Object value) -->
                <html:options property="skillLevels"/>
              </html:select><br>
  jsp skill:<html:select property="skill(jsp)">
                <html:options property="skillLevels"/>
              </html:select><br>
  struts skill:<html:select property="skill(struts)">
                   <html:options property="skillLevels"/>
                 </html:select><br>

輸出頁面
    Friend 1:<bean:write name="ActionForm" property="friend[0]"/><br><!-- 調用getFriend(int index)-->
    Friend 2:<bean:write name="ActionForm" property="friend[1]"/><br>
    Friend 3:<bean:write name="ActionForm" property="friend[2]"/><br>
  java skill :<bean:write name="ActionForm" property="skill(java)"/><br><!-- 調用getSkill(String key) -->
  jsp skill :<bean:write name="ActionForm" property="skill(jsp)"/><br>
  struts skill :<bean:write name="ActionForm" property="skill(struts)"/>