使用Struts 2和Struts的cookie

Question

我有以下(缩短)struts2动作:

public class MyAction extends BaseAction implements CookiesAware {

  public String execute() {

    if (cookiesMap.containsKey("BLAH"))
      blah=Integer.parseInt(cookiesMap.get("BLAH"));

      return "success";
  }

  // For handling cookies
  Map<String, String> cookiesMap;
  @Override
  public void setCookiesMap(Map<String, String> cookiesMap) {
    this.cookiesMap = cookiesMap;
  }
}

当我执行'cookiesMap.containsKey'时,我得到一个空指针异常 - 在我看来,没有调用setCookiesMap.我已经实现了CookiesAware界面,所以我认为它应该被调用 - 我错过了什么吗？

谢谢

Answer 1

看来struts只支持读取cookie,你必须转到servlet响应来实际设置 cookie.

最后,我选择完全绕过struts2 cookie支持并直接转到servlet请求/响应对象进行读写:

public class MyAction extends ActionSupport implements ServletResponseAware, ServletRequestAware {

  public int division;

  public String execute() {

    // Load from cookie
    for(Cookie c : servletRequest.getCookies()) {
      if (c.getName().equals("cookieDivision"))
        division=Integer.parseInt(c.getValue());
    }

    // Save to cookie
    Cookie div = new Cookie("cookieDivision", String.format("%d",division));
    div.setMaxAge(60*60*24*365); // Make the cookie last a year
    servletResponse.addCookie(div);

    return "success";
  }

  // For access to the raw servlet request / response, eg for cookies
  protected HttpServletResponse servletResponse;
  @Override
  public void setServletResponse(HttpServletResponse servletResponse) {
    this.servletResponse = servletResponse;
  }

  protected HttpServletRequest servletRequest;
  @Override
  public void setServletRequest(HttpServletRequest servletRequest) {
    this.servletRequest = servletRequest;
  }
}

并且struts.xml或web.xml中没有此方法所需的配置,这是一个奖励.所以我对这个解决方案感到满意,即使它确实在光线不好的情况下绘制struts2.

Answer 2

您还需要在struts.xml中为action定义实现Cookie Interceptor:

<action name="MyAction" class="your.fancy.app.MyAction">
    <interceptor-ref name="defaultStack"/>       
    <interceptor-ref name="cookie">
        <param name="cookiesName">BLAH</param>
    </interceptor-ref>
    <result>/index.jsp</result>
</action>