<struts>
    <package name="default" namespace="/" extends="struts-default">
        <action name="index" class="com.wangcf.testAction3">
            <result>${resultName}</result>
        </action>
    </package>
</struts>

public class testAction3 extends ActionSupport{
    private String resultName;
    
    public String getResultName(){
        System.out.println("resultName...");
        return resultName;
    }
    @Override
    public String execute() throws Exception{
        System.out.println("开始。。。。");
        this.resultName="MyJsp.jsp";
        return SUCCESS;
    }
}