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Parameters in configuration results
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Added by Dariusz Wojtas, last edited by Dariusz Wojtas on Feb 03, 2007 (view change)

Sometimes there is a need to redirect from one action to another, but you do not know the exact url or the destination url requires parameters that are only known in runtime.

Struts 2 gives you easy to use solution for that problem.

## Parameters in action result definitions

    <struts>
    ....
       <package name="somePackage" namespace="/myNamespace" extends="struts-default">
          <action name="myAction" class="com.project.MyAction">
             <result name="success" type="redirect-action">otherAction?id=${id}</result>
             <result name="back" type="redirect">${redirectURL}</result>
          </action>

          <action name="otherAction" class="com.project.MyOtherAction">
             ...
          </action>
       </package>
    ....
    </struts>

The only requirement is to declare the necessary properties in your action, in this case `com.project.MyAction` should define properties `id` and `redirectURL` with standard accessor methods.

    public class MyAction extends ActionSupport {
       private int id;
       private String redirectURL;
       ...

       public String execute() {
           ...
          if (someCondition) {
             this.redirectURL = "/the/target/page.action";
             return "back";
          }

          this.id = 123;
          return SUCCESS;
       }

       public int getId() { return this.id; }
       public void setId(int id) { this.id = id; }
       public String getRedirectURL() { return this.redirectURL; }
       public void setRedirectURL(String redirectURL) { this.redirectURL= redirectURL; }
       ...
    }

In the above code if it returns `SUCCESS` then the browser will be forwarded to
`/<app-prefix>/myNamespace/otherAction.action?id=123`