Tue, 15 Jul 2008 22:43:00 GMT

struts.xml配置文�g

     < action name ="*_*_*" class ="{0}Action" >
       < result name ="input" type ="freemarker" > /WEB-INF/template/strong/{1}/{1}_{2}_XianShi.ftl result >
       < result name ="success" type ="freemarker" > /WEB-INF/template/strong/{1}/{0}.ftl result >
     action >

��d��操作Action 对应Action名�ؓsxt_DengLu_CaoZuo 对应�?span style="color: rgb(0, 0, 0);">input result�?span style="color: rgb(0, 0, 0);">/WEB-INF/template/strong/sxt/sxt_DengLu_XianShi.ftl

Sxt_DengLu_CaoZuoAction.java

@Component( " sxt_DengLu_CaoZuoAction " ) // 使用了Spring �q�里的意思是��本Action装配��Z��个ID为sxt_DengLu_CaoZuoAction的Bean
@Scope( " prototype " ) // 作用域�ؓprototype ��x��ơ都使用新的对象
public class Sxt_DengLu_CaoZuoAction extends ActionSupport implements ModelDriven < MYh > {

��D��列表Action 对应Action名�ؓsxt_DaoHang_XianShi 对应�?span style="color: rgb(0, 0, 0);">success result�?span style="color: rgb(0, 0, 0);">/WEB-INF/template/strong/sxt/sxt_DaoHang_XianShi.ftl

Sxt_DaoHang_XianShiAction.java

@Component( " sxt_DaoHang_XianShiAction " ) // 同上
@Scope( " prototype " ) // 同上
public class Sxt_DaoHang_XianShiAction extends ActionSupport implements Preparable{

sxt_DengLu_XianShi.ftl

  // 使用action标签��导航列表导入到本页�?/span>
  <@s.action name="sxt_DaoHang_XianShi" namespace="/ht" executeResult=true ignoreContextParams=true />
  <@s.form action="sxt_DengLu_CaoZuo" id="form_login" theme="simple">
    <table align="CENTER" id="table_login">
      <tr>
        <td class="td_label">��d��?/span>td>
        <td class="td_input"><@s.textfield label="${action.getText('TYH_YHDLM')}" id="yhDlm" name="yhDlm" />td>
      tr>
      <tr>
        <td class="td_label">密码td>
        <td class="td_input"><@s.password label="${action.getText('TYH_YHMM')}" id="yhMm" name="yhMm" />td>
      tr>
      <tr>
        <td class="td_label"> td>
        <td class="td_input"><p id="p_submit">
          <@s.submit value="${action.getText('PAGE_DENG_LU')}" />
          <input type="button" value="${action.getText('PAGE_TUI_CHU')}">
        p>td>
      tr>
    table>
  @s.form>

sxt_DaoHang_XianShi.ftl

Sxt_DengLu_CaoZuoAction.java 执行execute

  @Override
   public String execute() throws Exception {
     this .addActionError( " �pȝ��错误 " );
     return INPUT;
  }

Sxt_DaoHang_XianShiAction.java 执行execute

  @Override
   public String execute() throws Exception {
    ActionContext ctx = ActionContext.getContext();
    ctx.put( " listDaoHangLieBiao " , new ArrayList());
     return SUCCESS;
  }

�q�个时候执行代�?freemarker会提�C��?lt;pre>Expression listDaoHangLieBiao is undefined”�ؓ什么会�q�样了？
仔细查找了相兌��?发现apache的文�?http://struts.apache.org/2.x/docs/how-do-we-repopulate-controls-when-validation-fails.html中写�?br />

When validation fails, we typically forward back to the same server page, so that the errors can be presented, and so that the client can fix the problem and resubmit the form. Of course, aside from the errors, we may also need to present rich controls, like drop down lists.

If we try to populate rich controls in an Action method, like input or execute, and validation fails, the method will not be invoked, and the controls are not populated. Two alternative ways to populate controls are the Preparable interface and the action tag.

大致的意思是但出现validation错误的时候会影响到Action的正常执行，�q�个时候应该实�?tt>Preparable接口中的prepare()�Ҏ��Q�这个方法中的操作不会因为validation错误而不执行�?/font>

联想��C��面的错，会不会也是因为addActionError而导致不能正�怋�用action标签了。�ؓ此在Sxt_DaoHang_XianShiAction中实现Preparable接口�q�在prepare()�Ҏ��中put listDaoHangLieBiao。修改代码如�?/span>

Sxt_DaoHang_XianShiAction.java

@Component( " sxt_DaoHang_XianShiAction " )
@Scope( " prototype " )
public class Sxt_DaoHang_XianShiAction extends ActionSupport   implements Preparable{

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

   public void prepare() throws Exception {
    ActionContext ctx = ActionContext.getContext();
    ctx.put( " listDaoHangLieBiao " , Constants.DAO_HANG_LIE_BIAO);
  }
}

再执�?=成功�?/font>

�ȝ�� Struts2目前的资料相对Struts1来说是非常少的，��其是研�I�的很深的资料，看来现在惛_��好Struts2�q�必��M��Apache的原始资料中��L��?/font>

另外上面使用action标签的时候是�q�样写的

< @s.action name = " sxt_DaoHang_XianShi " namespace = " /ht " executeResult = true ignoreContextParams = true />

注意和Struts2的标�{�ֆ�法略有不同，因�ؓ�q�里使用了Freemarker做模板，所以��用的freemarker的写法，特别的是executeResult=true ignoreContextParams=true而按照Struts2的标�{�ֺ�该是executeResult="true" ignoreContextParams="true"

哈哈 ��小两个引号 ��x��折腾N个小�?br />

我是一块硬�?/a> 2008-07-16 06:43 发表评论

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