从总体上讲，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
从总体上讲，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
看一个示例项目，我看到了这些___action类型类的分配.
Looking at a sample project, I see allot of these ___action type classes.
这只是一个引用控制器动作的动作吗?即基于get/post对特定网址的响应?
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(请记住，Struts2具有很高的可配置性，其各部分之间的耦合性很好)
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执行的
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
<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:
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将使Struts2实例化SumAction对象，设置x和y属性并调用execute方法.如果返回成功"，那么它将把动作放在某个作用域"中，前进到"/SumResult.jsp"，其中通常使用一些struts2标签显示结果，并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，在不太普通的情况下，execute()方法将调用服务层.
Of course, in less trivial scenarios the execute() method would call the service layer.
所以，不清楚动作是控制器还是控制器+模型，稍后再说，因为它不仅具有处理请求的逻辑，而且还充当数据容器(输入和结果) ).但仅在请求范围内.
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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