Struts 1.*

Configure web.xml for Struts

<servlet>

   <servlet-name>action</servlet-name>

   <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>

   <init-param>

      <param-name>config</param-name>

      <param-value>/WEB-INF/struts-config.xml</param-value>

   </init-param>

   <load-on-startup>2</load-on-startup>

</servlet>

<servlet-mapping>

   <servlet-name>action</servlet-name>

   <url-pattern>*.do</url-pattern>

</servlet-mapping>

Prevent from resubmit form

public ActionForward beforeLogin( .. ) throws Exception { 

       this.saveToken(request);//save token before showing Login.jsp

       return mapping.findForward(LOGINPAGE); 

} 

public ActionForward login( .. ) throws Exception { 

   if(this.isTokenValid(request)){ 

      resetToken(request); 

   }else if(!this.isTokenValid(request)){

      ActionErrors actionErrors = new ActionErrors();

      actionErrors.add("Resubmit", new ActionMessage("Resubmit.Resubmit"));

      saveErrors(request, actionErrors);

    } 

    return mapping.findForward(LOGINSUCCESS); 

} 

Include action

1. In struts-config.xml

<action path="/myIncludeLink" type="org.apache.struts.actions.IncludeAction" parameter="/include.jsp" />

2. In Jsp

<jsp:include page="/myIncludeLink.do" />

Forward action

1. In struts-config.xml

<action path="/CalculationPage" type="org.apache.struts.actions.ForwardAction"

                     parameter="/pages/calculation.jsp" />

2. In Jsp

<html:link action="/Welcome.do">Forward Action</html:link>

Dynaform

1. In Struts-config.xml

<form-bean name="calculationForm"

       type="org.apache.struts.action.DynaActionForm">

           <form-property name="number1" type="java.lang.Integer" />

           <form-property name="number2" type="java.lang.Integer" />

           <form-property name="total" type="java.lang.Integer" />

</form-bean>

2. In Action class

DynaActionForm calForm = (DynaActionForm) form;

Integer number1 = Integer.parseInt(calForm.get("number1").toString());

Configuring action class in struts-config.xml

<action path="/calculation" type="com.shambhu.kumar.actions.CalculationAction"

       name="calculationForm" parameter="method">     

    <forward name="success" path="/pages/calculation.jsp"/>  

</action>

Configuring Message resource propeties

<message-resources parameter="ApplicationResources" />

Configuring validation Plug-in

<plug-in className="org.apache.struts.validator.ValidatorPlugIn">

   <set-property property="pathnames"   

value="/WEB-INF/validator-rules.xml, /WEB-INF/validator-user.xml" />

</plug-in>

Validation-user.xml

<form-validation>

   <formset>

       <form name="loginForm">

          <field property="username" depends="required,maxlength,minlength,mask">

             <msg name="required" key="err.user.username.required" />

             <msg name="minlength" key="err.user.username.length" />

             <msg name="mask" key="err.user.username.invalid" />

             <arg name="minlength" key="${var:minlength}" position="0"

                     resource="false" />

             <var>

                 <var-name>minlength</var-name>

                 <var-value>3</var-value>

             </var>

              <var>

                  <var-name>mask</var-name>

                  <var-value>^[a-zA-Z0-9-_]*$</var-value>

               </var>

           </field>

      </form>

   </formset>

</form-validation>

Can pass method name from button

<html:form action="calculation">

<table>

  <tr>

    <td align="center" bgcolor="red" colspan="2"><html:errors /></td>

  </tr>

  <tr>

    <td align="right" width="35%">Number 1 :</td>

    <td align="left"><html:text property="number1" /></td>

  </tr>

  <tr>

    <td align="right">Number 2 :</td>

    <td align="left"><html:text property="number2" /></td>

  </tr>

  <tr>

    <td align="right">Total :</td>

    <td align="left"><html:text property="total" /></td>

  </tr>

  <tr>

    <td align="right" colspan="2">

      <html:submit property="method" value="add" />

      <html:submit property="method" value="substract" />

      <html:submit property="method" value="multiply" />

    </td>

  </tr>

</table>

</html:form>