不推荐使用richfaces javax.faces.el.MethodBinding替换使用 [英] Deprecated richfaces javax.faces.el.MethodBinding replacement use

问题描述

我发现这段代码的工作原理是我可以通过编程方式创建一个richfaces下拉菜单。但有些代码已被弃用。谁能告诉我要放入什么而不是弃用的电话？

I found this piece of code works in that i can programmatically creates a richfaces dropdown menu. But some of the code is deprecated. Can anyone tell me what to put in instead of the deprecated calls?

谢谢

     public HtmlDropDownMenu getMyMenu()
 {
  HtmlDropDownMenu menu = new HtmlDropDownMenu();
  menu.setValue( "Node Select" );

  HtmlMenuItem menuItem = new HtmlMenuItem();
  // TODO programmatically pass from getNodes into a String[] rather than an ArrayList of SelectItems
  String subOption = "myBox";   
  menuItem.setValue( subOption );

  Application app = FacesContext.getCurrentInstance().getApplication();
  javax.faces.el.MethodBinding mb = app.createMethodBinding( "#{PrismBacking.onItemClick}", new Class[] { ActionEvent.class } );
  menuItem.setActionListener( mb );

  menu.getChildren().add( menuItem );
  return( menu );
 }

 public void onItemClick( ActionEvent event )
 {
  Object obj = event.getSource();

  if( obj instanceof HtmlMenuItem )
  {
   HtmlMenuItem item = (HtmlMenuItem)obj;
   if( item != null )
   {
    lastItem = item.getValue().toString();

   }
  }
 }

不推荐的代码行是：

   javax.faces.el.MethodBinding mb = app.createMethodBinding( "#{PrismBacking.onItemClick}", new Class[] { ActionEvent.class } );
  menuItem.setActionListener( mb );

推荐答案

javadocs明确说明：

The javadocs state it clearly:

Application.createMethodBinding

已弃用。这已被替换为调用getExpressionFactory（）然后 ExpressionFactory.createMethodExpression（javax.el.E​​LContext，java.lang.String，java.lang.Class，java.lang.Class []）。

Deprecated. This has been replaced by calling getExpressionFactory() then ExpressionFactory.createMethodExpression(javax.el.ELContext, java.lang.String, java.lang.Class, java.lang.Class[]).

以下是如何使用它：

MethodExpression methodExpression = 
    application.getExpressionFactory().createMethodExpression(
         FacesContext.getCurrentInstance().getELContext(), 
         "#{PrismBacking.onItemClick}", 
         null, 
         new Class[] { ActionEvent.class });
menuItem.setActionExpression(methodExpression);

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