这个方法会在action初始化的时候调用,这样在action初始化的时候就把spring管理的bean付给了action(作为action的全局变量),但是要注意的是在action中只有无状态的对象才能作为action的全局变量哦.
private PetStoreFacade petStore;
public void setServlet(ActionServlet actionServlet) {
super.setServlet(actionServlet);
if (actionServlet != null) {
ServletContext servletContext = actionServlet.getServletContext();
WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
this.petStore = (PetStoreFacade) wac.getBean("petStore");
}
System.out.println("俺已经初始化了么?");
}
启动tomcat时候,没有输出该语句.
我进入首页后,点击 Enter the Store,控制台输出了该语句,此时执行的DoNothingAction
其代码如下:
代码
public class DoNothingAction extends BaseAction {
/* Public Methods */
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
return mapping.findForward("success");
}
}
所以看来确实是在Action初始化的时候执行的该方法.
不过每次执行一个BaseAction子类,setServlet()方法就要执行一次.
参考资料:http://www.javaeye.com/topic/40646