没有必要设置所有字段，除非特别希望利用特定字段限制搜索。
It is not necessary to set all fields unless you specifically want to limit the search based on that field.
表单的To字段将获得该参数，并利用它将消息传递到正确用户。
The to field of the form picks up this parameter and USES it to deliver the message to the correct user.
现在，我们可以通过定义字段来利用Struts工具特性之一以创建这个JSP，且所创建的jsp会用缺省布局来显示这些字段。
By defining the fields now, we can use one of the Struts tooling features to create a JSP with these fields in a default layout.
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