郁闷 page方法不能带参数吧

那么我要在这个From 提交事件中，登陆后传递一个值给页面怎么办 只能用session存储吗 或者用那个Visit对象存储？

 String url = ((TSHBaseEngine) this.getPage().getEngine()).getPageLinkUrl("LoginSuccess");
   LoginSuccess loginSuccessPage=(LoginSuccess)cycle.getPage("LoginSuccess");
   loginSuccessPage.setUsername(getUsername());
   getSuccessPage().setUsername(getUsername());
   throw new RedirectException(url);
   //return  getSuccessPage();

呵呵，你咋能这么做呢？你跳转的是LoginSuccess页面的PageLink，既然是PageLink，那么你向LoginSuccess页面set值又有什么意义呢？你那些属性又不是持久化的，怎么会认为页面状态会保持呢？

你可以看看书上关于页面属性的介绍，什么是瞬时，什么是持久化。

1.Engine类

public class TBaseEngine extends BaseEngine{

 /**
  * 根据传递进来的页面名称，返回一个PageLink方式的url，配合RedirectException即可完成PageLink跳转。
  *
  * @param pageName
  *            页面名称
  * @return
  */
 @SuppressWarnings( { "deprecation", "unchecked" })
 public String getPageLinkUrl(String pageName) {
  IEngineService service = this.getService(Tapestry.PAGE_SERVICE);
  Map parameters = new HashMap();
  parameters.put(ServiceConstants.PAGE, pageName);
  return this.getInfrastructure().getLinkFactory().constructLink(service,
    false, parameters, true).getURL();
 }
 
}

2.

在登陆页LoginPage.java使用

public abstract class LoginPage extends BasePage implements PageBeginRenderListener,PageValidateListener{

.....

//下面是LoginPage.java的135行,出错误在这里

      String url = ((TBaseEngine) cycle.getPage().getEngine()).getPageLinkUrl("MainPage");
      throw new RedirectException(url);

...

}

3.

MainPage.page

<page-specification class="com.longcredit.KEye.app.business.LoginPage">

....以下无关省略

4.问题:

在LoginPage.java使用 //ActPage page = (ActPage) cycle.getPage("MainPage");都是正常的,今天顺手写了个避免重复提交的实现,经常写,反而出错了

下面是错误:

org.apache.tapestry.BindingException
Exception invoking listener method loginSubmit of component Login: Failure invoking listener method 'public org.apache.tapestry.IPage com.longcredit.KEye.app.business.LoginPage.loginSubmit(org.apache.tapestry.IRequestCycle)' on $LoginPage_0@79dbc7[Login]: org.apache.tapestry.engine.BaseEngine
binding:	org.apache.tapestry.binding.ListenerMethodBinding@205b65[parameter listener, component=Login, methodName=loginSubmit, location=context:/WEB-INF/Login.page, line 8, column 64]
component:	$LoginPage_0@79dbc7[Login]
location:	context:/WEB-INF/Login.page, line 8, column 64 3 "-//Apache Software Foundation//Tapestry Specification 4.0//EN" 4 "http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd"> 5 <page-specification class="com.longcredit.KEye.app.business.LoginPage"> 6   7 <component id="loginForm" type="Form"> 8 <binding name="listener" value="listener:loginSubmit"/> 9 </component> 10   11 <component id="username" type="TextField"> 12 <binding name="value" value="username"/> 13 </component>
org.apache.hivemind.ApplicationRuntimeException
Failure invoking listener method 'public org.apache.tapestry.IPage com.longcredit.KEye.app.business.LoginPage.loginSubmit(org.apache.tapestry.IRequestCycle)' on $LoginPage_0@79dbc7[Login]: org.apache.tapestry.engine.BaseEngine
component:	$LoginPage_0@79dbc7[Login]
location:	context:/WEB-INF/Login.page, line 5, column 72 1 <?xml version="1.0" encoding="GB2312"?> 2 <!DOCTYPE page-specification PUBLIC 3 "-//Apache Software Foundation//Tapestry Specification 4.0//EN" 4 "http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd"> 5 <page-specification class="com.longcredit.KEye.app.business.LoginPage"> 6   7 <component id="loginForm" type="Form"> 8 <binding name="listener" value="listener:loginSubmit"/> 9 </component> 10
java.lang.ClassCastException
org.apache.tapestry.engine.BaseEngine
Stack Trace:
com.longcredit.KEye.app.business.LoginPage.loginSubmit(LoginPage.java:135) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:585) 为什么总显示类型不匹配啊,我的也面类 类型是一致的

你用TBaseEngine来实现IEngine，那么你是否在application文件里面配制TBaseEngine呢？