[Struts2 Study Notes (2)] the default values in the Action configuration and the forwarding types of results in the Action, struts2 Study Notes

[Struts2 Study Notes (2)] the default values in the Action configuration and the forwarding types of results in the Action, struts2 Study Notes
I. default values in Action configuration

<Span style = "font-size: 18px; "> <package name =" itcast "namespace ="/test "extends =" struts-default "> <action name =" helloworld "class =" cn. itcast. action. helloWorldAction "method =" execute "> <result name =" success ">/WEB-INF/page/hello. jsp </result> </action> </package> 1> if no class is specified for action, ActionSupport is used by default. 2> if no method is specified for the action, the execute () method in the action is executed by default. 3> If the name attribute of result is not specified, the default value is success. </Span>

Ii. Various forwarding types of result in Action

<span style="font-size:18px;"><action name="helloworld" class="cn.itcast.action.HelloWorldAction"><result name="success">/WEB-INF/page/hello.jsp</result></action>

(1) result configuration is similar to forward in struts1, but struts2 provides multiple result types. Common types include dispatcher (default), redirect, redirectAction, and plainText.

(2) You can also use the $ {attribute name} expression in the result to access the attributes in the action. The attribute names in the expression correspond to the attributes in the action. As follows:

<result type="redirect">/view.jsp?id=${id}</result>

(3) The following is an example of the redirectAction result type. If the redirected action is in the same package:

<action name="redirectAction"><result type="redirectAction">helloworld</result></action>

If the redirected action is in another namespace:

<Struts> <package name = "itcast" namespace = "/control/employee" extends = "base"> <action name = "list" class = "cn. itcast. action. helloWorldAction "method =" execute "> <result name =" success "type =" redirect ">/employeeAdd. jsp? Username =$ {username} </result> </action> <action name = "redirect"> <result type = "redirect">/employeeAdd. jsp </result> </action> <action name = "redirectAction"> <! -- In different namespaces --> <result type = "redirectAction"> <param name = "actionName"> xxx </param> <! -- Action name --> <param name = "namespace">/control/department </param> </result> </action> </package> <package name = "other "namespace ="/control/department "extends =" base "> <action name =" xxx "> <result>/WEB-INF/page/hello. jsp </result> </action> </package> </struts>

(4) plaintext: display the content of the original file. For example, this type can be used when the source code of the jsp file needs to be displayed as is.

<Result name = "source" type = "plainText"> <param name = "location">/xxx. jsp </param> <param name = "charSet"> UTF-8 </param> <! -- Specify the encoding of the file to be read --> </result>

How to write the result of the struts2 configuration file to jump to the action in other namespaces?

You need to set through param
<Result name = "suc" type = "redirectAction">
<Param name = "namespace">/Tree </param>
<Param name = "actionName"> treeLoadAction </param>
</Result>

Question about struts2 default action configuration in strutsxml

Of course, the path address is like this: localhost: 8080/project name/namespace value/action name value.
Without namespace, the attribute becomes the name value of localhost: 8080/project name // action.