jsp - struts2编写拦截器？

Question

关于 prepare 拦截器的 Struts2 文档说:

A typical use of this is to run some logic to load an object from the database so that when parameters are set they can be set on this object. For example, suppose you have a User object with two properties: id and name. Provided that the params interceptor is called twice (once before and once after this interceptor), you can load the User object using the id property, and then when the second params interceptor is called the parameter user.name will be set, as desired, on the actual object loaded from the database.

我无法理解它对 User 对象做了什么改变。谁能用一些代码解释一下？或者给出解释的链接？

Answer 1

这是 paramsPrepareParamsStack 的典型用法。可以看到this也回答。您可以找到使用此堆栈的示例 here .

您初始化操作实例的方式可能会有所不同，这就是此堆栈适用的原因。通常，您可能只是实例化一个 User 对象来接受参数，而不是从数据库中检索它。