提供为任意对象类型注册额外的转换器的功能。

Provides the ability to register additional converters for arbitrary object types.

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如果转换器产生了一个交易类型的对象，随后处理类必须包含一个名为handle (trade trade)的方法。

If the converter produced an object of type trade, then the handler class must contain a method named handle (trade trade).

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转换器必须在这里将请求字符串转换为所需的对象类型，然后返回这个对象，将它存储在相应的JSF组件中。

This is where the converter must convert the request string value into the desired object type, and then return the object for storage in the corresponding JSF component.

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