Struts2 learning notes-dynamic method call and parameter acquisition

Struts2 Study Notes

Note 6: struts. xml introduces multiple configuration files for dynamic method calls and parameter acquisition

(1 ),Introduce multiple struts configuration files

<Include file = "struts_user.xml"/>

<Include file = "struts_person.xml"/>

(2 ),Dynamic method call

2-1: The URL specifies the method name for access:

For example:Useraction! Userinfo. Action, indicating to call the userinfo method of useraction.

2-2: Configure constants for dynamic method calls

<Constant name = "struts. Enable. dynamicmethodinvocation" value = "true"/>

2-3: Access with wildcards

<Action name = "User _ *" class = "com. Controller. useraction" method = "{1}">

<Result>/index. jsp </result>

</Action>

IfUseractionThere are two methods: A and B.

This can be written as follows during the call:User_a.action, user_ B .action.

(3 ),Parameter acquisition: using attributes or object reflection

3-1: Add parameter fields in the action class

For example, public class useraction{

Private string name;

Public void setname (string name) {// This method is required

This. Name = Name;

}

// Other methods ....................

}

Note: The field name is the same as the name after set.

This parameter acquisition is not differentiated by the get/POST method. In essence, it is obtained by calling the getparameter method of httprequest.

3-2: Object Data Type (composite type) Reflection receiving Parameter

Public class useraction{

Private person;

Public void setperson (string person) {// This method is required

This.Person=Person;

}

Public String saveuser (){

Return "success ";

}

}

The form field can be person. ID, person. Name;

El expression for receiving JSP pages: Id =$ {person. ID}, name =$ {person. name}