概括地说，struts2 是如何工作的?我来自 mvc 背景 [英] At a high level, how does struts2 work? I'm coming from a mvc background
问题描述
概括地说，struts2 是如何工作的?我来自mvc背景
At a high level, how does struts2 work? I'm coming from a mvc background
查看一个示例项目，我看到了这些 ___action 类型的类.
Looking at a sample project, I see allot of these ___action type classes.
它只是对控制器动作的动作引用吗?即基于 get/post 对特定 url 的响应?
Is it just a action references to a controller action? i.e. a response to a particular url based on get/post?
推荐答案
典型的 Struts2 工作流程(记住 Struts2 是高度可配置的，它的各个部分很好地解耦)
Typical Struts2 workflow (bear in mind that Struts2 is extremely configurable, its parts are well decoupled)
struts.xml => 定义映射":
- 为每个 URL 执行哪个
action - 一个或多个
results:哪个资源(通常是 JSP)为操作返回的每个结果生成视图
- which
actionis executed for each URL - one or more
results: which resource (typically a JSP) generates the view for each result returned by the action
因此，例如，说 struts.xml 包含
Hence, for example, say a struts.xml contains
<action name="add" class="example.SumAction">
<result name="error">/Error.jsp</result>
<result name="success">/SumResult.jsp</result>
</action>
您的 Java 操作是:
And your Java action is:
public class SumAction {
private int x;
private int x;
private int z;
// getters and setters ommited
public String execute() {
z = x + y;
return "success";
}
}
然后请求 http://mysite.com/mywebapp/add.action?x=10&y=20 会使 Struts2 实例化一个 SumAction 对象，设置 x 和 y 属性并调用 execute 方法.如果返回成功"，那么它会将动作放在某个范围"中，转发到/SumResult.jsp"，其中通常使用一些 struts2 标记来显示结果，将其从动作对象中拉出.
Then the request http://mysite.com/mywebapp/add.action?x=10&y=20 would make Struts2 to instantiate a SumAction object, set the x and y properties and call the execute method. If "success" is returned, then it will place the action in some "scope", forward to "/SumResult.jsp" in which typically one use some struts2 tag to show the result, pulling it from the action object.
Result: <b><s:property value="z" /></b>
当然，在不太简单的场景中，execute() 方法会调用服务层.
Of course, in less trivial scenarios the execute() method would call the service layer.
所以，动作是控制器还是控制器+模型不是很清楚，我会说后者，因为它不仅具有处理请求的逻辑，而且还充当数据的容器(输入和结果).但仅限于请求范围内.
So, it's not very clear if the action is controller or controller+model, I'd say the later, because it not only has the logic to process the request but also acts as a container of the data (input and result). But only during the scope of a request.
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