ConverterTag (Java EE 5 SDK)

javax.faces.webapp Class ConverterTag

java.lang.Object
  javax.servlet.jsp.tagext.TagSupport
      javax.faces.webapp.ConverterTag

所有已实现的接口:

Serializable, IterationTag, JspTag, Tag

public class ConverterTag

extends TagSupport

ConverterTag is a base class for all JSP custom actions that create and register a Converter instance on the ValueHolder associated with our most immediate surrounding instance of a tag whose implementation class is a subclass of UIComponentTag. To avoid creating duplicate instances when a page is redisplayed, creation and registration of a Converter occurs only if the corresponding UIComponent was created (by the owning UIComponentTag) during the execution of the current page.

This class may be used directly to implement a generic converter registration tag (based on the converter-id specified by the converterId attribute), or as a base class for tag instances that support specific Converter subclasses. This converterId attribute must refer to one of the well known converter-ids, or a custom converter-id as defined in a faces-config.xml file.

Subclasses of this class must implement the createConverter() method, which creates and returns a Converter instance. Any configuration properties that specify behavior of this Converter must have been set by the createConverter() method. Generally, this occurs by copying corresponding attribute values on the tag instance.

This tag creates no output to the page currently being created. It is used solely for the side effect of Converter creation.

另请参见:

Serialized Form

ConverterTag

public ConverterTag()

Deprecated. 

setConverterId

public void setConverterId(String converterId)

Deprecated. 

Set the identifer of the Converter instance to be created.

参数:

converterId - The identifier of the converter instance to be created.

setBinding

public void setBinding(String binding)
                throws JspException

Deprecated. 

Set the expression that will be used to create a ValueExpression that references a backing bean property of the Converter instance to be created.

参数:

binding - The new expression

抛出异常:

JspException - if a JSP error occurs

doStartTag

public int doStartTag()
               throws JspException

Deprecated. 

Create a new instance of the specified Converter class, and register it with the UIComponent instance associated with our most immediately surrounding UIComponentTag instance, if the UIComponent instance was created by this execution of the containing JSP page. If the localValue of the UIComponent is a String, attempt to convert it.

规范说明:

doStartTag in interface Tag

重写:

doStartTag in class TagSupport

返回:

SKIP_BODY

抛出异常:

JspException - if a JSP error occurs

另请参见:

Tag.doStartTag()

release

public void release()

Deprecated. 

Release references to any acquired resources.

规范说明:

release in interface Tag

重写:

release in class TagSupport

另请参见:

Tag.release()

createConverter

protected Converter createConverter()
                             throws JspException

Deprecated. 

Create and return a new Converter to be registered on our surrounding UIComponent.

抛出异常:

JspException - if a new instance cannot be created

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