valuestack

问题 I have a list products with these attributes : Identifier Color Size Supplier Supplier attribute is an object that has these attributes : Name Phone For each product in my list, i'd like to display the identifier & the supplier name. How can i do this with struts / jstl ? Here is what i'm trying with no success : <s:iterator value="products"> <tr> <td><s:property value="identifiant"/></td> <td><s:property value="supplier.name"</td> </tr> </s:iterator> 回答1: There should be getters for each

问题 I am working now in a Struts2 project which uses OGNL. I see three different ways to access data in JSP using OGNL. value1 ="previousList" value2 = "#previousList" value3 = "%{previousList}" What these will do and are there other ways to access data from OGNL? 回答1: The value stack which is an implementation of ValueStack has two methods push and set . The first method pushes the variable to the stack, but the second sets in to the value stack's context. If the variable in the value stack's

问题 How do I convert a JSP variable to a Struts2 variable? I've tried the following: <%=scoredDocument%> <s:push value="scoredDocument"/> <s:push value="#scoredDocument"/> <s:push value="%{scoredDocument}"/> <s:push value="${scoredDocument}"/> <s:push value="#page.scoredDocument"/> <s:push value="%{#page.scoredDocument}"/> <display:column title="Study Code" sortable="true"> <s:property value="id"/> The most frequent error is Caused by: tag 'push', field 'value': You must specify a value to push

问题 public class MyAction extends ActionSupport { public String getMyValue() { return "SomeText"; } ... } I have this MyAction class. Now, the question is that when I refer myValue in my JSP page using OGNL, will it create the myValue property on ValueStack , or will it just call the getter method? 回答1: It will call a getter method. The OGNL when evaluating an expression finding a property accessor corresponding to the name of the property. It's doing it using reflection on the method basis via

问题 I want list of items to be displayed along with each having a blank textfield to fill amount on my JSP page and once I fill the required items amount, I will submit. I have ExampleAction class as below, where I have populate() method which I fire first so that items are filled. I fire URL : http://localhost:8084/WebExample/populate.action. Same ExampleAction has execute mtd which I call on SUBMIT button action from JSP page. But my problem is in execute method, I am unable to get the objects

问题 I am new to Struts 2. I am studying it from the book Struts2 In Action. I am having difficulty in understanding some concepts in OGNL which are as follows- We know that params interceptor moves the data from the request parameters to the action object in ValueStack . Now while reading, I came upon a line that says- "The tricky part of the job is mapping the name of the parameter to an actual property on the ValueStack . This is where OGNL comes in. The params interceptor interprets the

问题 I am new to Struts 2. I am studying it from the book Struts2 In Action. I am having difficulty in understanding some concepts in OGNL which are as follows- We know that params interceptor moves the data from the request parameters to the action object in ValueStack . Now while reading, I came upon a line that says- "The tricky part of the job is mapping the name of the parameter to an actual property on the ValueStack . This is where OGNL comes in. The params interceptor interprets the

问题 I was reading Struts2 In Action, and it says for each request an ActionContext , a ValueStack and an Action instance are created, so they are thread safe. I was wondering how does the framework manages session, because it can't be stored in these locations, where does the actual Map gets stored, and how concurrent access to that Map is managed by the framework? 回答1: The http session is stored in the SessionMap which is among the other context maps is stored in the action context by the

问题 I'm trying to make my action classes singletons. The point is to make action classes real controllers in MVC pattern. Especially when implementing REST controllers the scope of the controller could be extended to the life of the application. Like in Spring framework the controller is put to the default scope by default, the default scope in Spring is singleton. Struts2 has also a default scope, and it's also singleton. I want to put my action classes to this scope and remove them from the

问题 I am planning to use refreshModelBeforeResult as suggested in Struts2 Documentation, however I am confused whether this property can be set in Action class or struts.xml . Is there is anything apart from what I have tried below <action name="myAction" class="com.stuff.MyActionClass" method="myMethod"> <result name="myHome" type="tiles">MyHome</result> <interceptor-ref name="basicStack" /> <interceptor-ref name="params"/> <interceptor-ref name="modelDriven"> <param name=