Using cookies with Struts 2 and Struts(在 Struts 2 和 Struts 中使用 cookie)
问题描述
我有以下(缩短的)struts2 动作:
I've got the following (shortened) struts2 action:
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,setCookiesMap 没有被调用.我已经实现了 CookiesAware 接口,所以我会认为它应该被调用 - 我在这里错过了什么吗?
I get a null pointer exception when i do 'cookiesMap.containsKey' - it seems to me that setCookiesMap isn't being called. I've implemented the CookiesAware interface so i would have thought that it should be getting called - have i missed something here?
谢谢
推荐答案
看来struts只支持读取cookies,你得去servlet响应才能真正设置一个cookie.
It appears that struts only supports reading cookies, you have to go to the servlet response to actually set a cookie.
最后,我选择完全绕过 struts2 cookie 支持,直接进入 servlet 请求/响应对象进行读写:
In the end, i've opted to bypass the struts2 cookie support entirely and go directly to the servlet request/response objects for both reading and writing:
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;
}
}
并且在 struts.xml 或 web.xml 中此方法不需要配置,这是一个额外的好处.所以我对这个解决方案很满意,即使它确实在光线不好的情况下绘制 struts2.
And there's no configuration required for this method in either struts.xml or web.xml, which is a bonus. So i'm happy with this solution, even if it does paint struts2 in a poor light.
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本文标题为:在 Struts 2 和 Struts 中使用 cookie
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