Accessing action instance variables and model-driven bean variable values in JSP

问题

I have searchKey as a variable in action class and model-driven bean object.

public class PaymentGateWayAction extends ActionSupport implements ModelDriven<PaymentResponseDTO> {
    private String searchKey;
    private PaymentResponseDTO paymentResponseDTO = new PaymentResponseDTO();
    // ...
}

searchKey is also a variable in PaymentResponseDTO.

I need to access searchKey from the action class and modeldriven bean based on some conditions. Having varible with same name is bad. But The above one is already developed. If I do any modification in Java file, I need to do many modifications which are difficult.

Now I need to access the action class variable. I tried to access the variable from action class in the follwing way:

<s:hidden id="searchKey" name="searchKey" value="%{searchKey}"/>

But it is returning null values.

I have below code also:

this.setSearchKey("somevarible");

Please suggest where the wrong is going on

struts.xml

<action name="atomResponse" class="com.PaymentGateWayAction" method="atomPaymentResponse">
  <result name="success" type="tiles">paymentGateWayResponse</result>
    <result name="failure" type="tiles">paymentGateWayResponseError</result>
  </action>

tiles xml

<definition name="paymentGateWayResponse" extends="b2cHome">
    <put-attribute name="body" value="agent_b2c/b2c_paymentGateWayResponse.jsp" />
</definition>

In b2c_paymentGatewayResponse.jsp the hidden field code is present.

回答1:

When both your model (on top of the stack) and your action (generally the item below the model) have properties of the same name you can disambiguate using either the #action value stack context variable, or by directly accessing the stack (bad idea).

<!-- Access action properties directly: -->
<s:property value="%{searchKey}" />          <!-- Model; top of stack.       -->
<s:property value="%{#action.searchKey}" />  <!-- Action; accessed directly. -->

<!-- Hope the stack never changes: -->
<s:property value="%{[0].searchKey}" />  <!-- Model;  top of stack.   -->
<s:property value="%{[1].searchKey}" />  <!-- Action; next stack pos. -->

来源：https://stackoverflow.com/questions/11407686/accessing-action-instance-variables-and-model-driven-bean-variable-values-in-jsp

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