Roman C Roman C - 1 month ago 14
Java Question

Can I map an action method that returns Object in Struts 2

I've used Struts2 to map actions to the methods that return

String
. Can I use other types? What types are possible to use?

I found that code using a REST plugin

// Handles /orders/{id} GET requests
public HttpHeaders show() {
model = orderManager.findOrder(id);
return new DefaultHttpHeaders("show")
.withETag(model.getUniqueStamp())
.lastModified(model.getLastModified());
}


It shows that it maps to method
show
that returns
HttpHeaders
. And it's not a
String
. How it works?

Answer

The framework has features that allows to return not only String. You can return an instance of the Result directly from the action method instead of a String. For example

public Result method() {
  //todo implementation is here  
}

If needed to return multiple types you can set return type as Object.

public Object method() {
    Object resultCode = "success";
    if (something) {
        resultCode = new StrutsResultSupport();
    }
    return resultCode ;
}

About the rest method HttpHeaders is a interface that doesn't extend Result, so it shouldn't be used as a result type.


to be continued

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