Struts wildcard path matching constant usage Configure default values

The Struts framework learns several ways to develop action

Mode 1: Inherit Actionsupport If you use the Struts checksum feature, you must inherit this class

Method 2: Implement the Action interface

Mode 3: Do not inherit any classes, do not implement any interfaces

1. Wildcard characters:

Configuration information in struts, can be optimized with * and {1}

 Public classuseraction {PrivateString UserName;  Public voidsetusername (String userName) { This. UserName =UserName; }    //Business processing methods in action     PublicString Login () {System.out.println ("Useraction.login ()" +userName); return"Login"; }     PublicString Register () {System.out.println ("Register ()" +userName); return"Register"; }}

< Packagename= "config"namespace= "/user"extends= "Struts-default"Abstract= "false">                <!--<action name= "Login" class= "cn.itcast.a_config. Useraction "method=" Login "> <result name=" Success ">/index.jsp</result> </a ction> <action name= "register" class= "Cn.itcast.a_config. Useraction "method=" register "> <result name=" Success ">/index.jsp</result> < ;/action> -                          <!--use wildcard characters to optimize the above steps -         <!--Http://localhost:8080/struts02/user_login -         <Actionname= "User_*"class= "Cn.itcast.a_config." Useraction "Method= "{1}">            <resultname= "{1}">/{1}.jsp</result>                    </Action>            </ Package>

2. Path matching principle

3. Constants

In the Struts-default.xml file:

<!---    <name = "Struts.action.extension"  value= "Action,do,"></constant>

<Struts>    <!--first, the global configuration -    <!--0. Request Data Encoding -     <constantname= "Struts.i18n.encoding"value= "UTF-8"/>    <!--1. Modify the Struts default access suffix -    <constantname= "Struts.action.extension"value= "Action,do,"></constant>    <!--2. Modify XML Auto Reload -    <constantname= "Struts.configuration.xml.reload"value= "true"/>    <!--3. Turn on dynamic method invocation (default does not open) -    <constantname= "Struts.enable.DynamicMethodInvocation"value= "true"/>    <!--4. Change the maximum size of the uploaded file to 30M -    <constantname= "Struts.multipart.maxSize"value= "31457280"/></Struts>

<Struts>    < Packagename= "Config2"namespace="/"extends= "Struts-default">            <!--Dynamic method invocation: Http://locahost:8080/struts02/user!login <action name= "user" class= "cn.itcast.b_config2.        Useraction "> <result name=" Success ">/index.jsp</result> </action>  -                           <!--wildcard character: Http://locahost:8080/struts02/user_login -        <Actionname= "User_*"class= "Cn.itcast.b_config2." Useraction "Method= "{1}">        </Action>                <!--<action name= "test" class= "Cn.itcast.b_config2.        Testaction "Method=" execute > Return result tag success The corresponding page is not configured in the current action, so we will find out if there is a success tag corresponding to the global configuration. </action> -                                         <!--what happens when class is not configured? The Aciton that is processed -        <!--answer: When just need to jump to web-inf resources.  -         <Actionname= "Test2">             <resultname= "Success">/web-inf/index.jsp</result>         </Action>            </ Package>        </Struts>

Global-results Global Jump View must be written before action

<!---         <!--name is  only configured with access path names              class The action that is executed by default is configured in Struts-default                      <default-class-ref class= "Com.opensymphony.xwork2.ActionSupport"/>  method defaults to execute              by default, execute returns a value of success, and the corresponding page goes to the global view.                -
<name= "Test"></action>    

Struts wildcard path matching constant usage Configure default values