關於struts2中action獲取引數的三種方法
阿新 • • 發佈:2019-02-01
public String add() throws Exception {
// ------------------------------方法一:通過設定get與set方法來獲取引數
System.out.println(this.username);
// ------------------------------方法二:通過request物件來獲取引數
/*
* public class SupperAction extends ActionSupport implements
*/
System.out.println(this.getRequest().getParameter("username"));
// ------------------------------方法三:通過ActionContext物件來獲取引數
// **import com.opensymphony.xwork2.ActionContext;
String[] username = (String[]) this.getContext().getParameters().get("username");
System.out.println(username[0] + username.length);
return "success";
// ------------------------------方法一:通過設定get與set方法來獲取引數
System.out.println(this.username);
// ------------------------------方法二:通過request物件來獲取引數
/*
* public class SupperAction extends ActionSupport implements
* ServletRequestAware{
*private HttpServletRequest request;
* private HttpSession session;
* private Application application;
* private ActionContext context;這是SupportAction,所有的子類action extends該父類,得到所有物件*/
System.out.println(this.getRequest().getParameter("username"));
// ------------------------------方法三:通過ActionContext物件來獲取引數
// **import com.opensymphony.xwork2.ActionContext;
String[] username = (String[]) this.getContext().getParameters().get("username");
System.out.println(username[0] + username.length);
return "success";
}
有些博文寫到在Context.getParameters();後轉換成Map,本人表示不解,轉換成Map後再去獲取引數,這時候就沒有get(“引數名”)這樣一個方法了。個人愚見 :覺得轉換成map是多此一舉。