它同时还完成数据输出，显示以及控制操作，做到人机互动。
It also completed the data output, display and control operations, do human-computer interaction.
除此之外，为了优化网络通信，开发者必须对输出数据的大小、格式和编码方法具有细微的控制。
Additionally, to optimize network traffic, the developer must have granular control over the size, format, and encoding of the output.
InputPortlet：从用户收集信息，并基于控制流显示输出数据。
InputPortlet: Collects input from the customer and displays output data based on the control flow.
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