spring 获取 POJO 类中的 Servlet Request 对象
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Get the Servlet Request object in a POJO class
提问by NRaf
I need to get the current page URL in a POJO that is being called from an Acegi class (need to add some custom logic for the app I'm working on) and need to retrieve the HttpServletRequest so that I can get the subdomain of the URL (on which the logic is based).
我需要在从 Acegi 类调用的 POJO 中获取当前页面 URL（需要为我正在处理的应用程序添加一些自定义逻辑）并且需要检索 HttpServletRequest 以便我可以获取子域URL（逻辑所基于的）。
I've tried to add:
我试图添加：
@Autowired
private HttpServletRequest request;
...
public void setRequest(HttpServletRequest request) {
this.request = request;
}
public HttpServletRequest getRequest() {
return request;
}
However when I try to use the request object in my code, it is null.
但是，当我尝试在我的代码中使用请求对象时，它为空。
Any idea what I am doing wrong or how I can better go about doing this?
知道我做错了什么或者我如何更好地去做这件事吗？
回答by sourcedelica
If the bean is request scoped you can autowire the HttpServletRequest like you are doing.
如果 bean 是请求范围的，您可以像您一样自动装配 HttpServletRequest。
@Component
@Scope("request")
public class Foo {
@Autowired private HttpServletRequest request;
//
}
Otherwise you can get the current request as follows:
否则，您可以按如下方式获取当前请求：
ServletRequestAttributes sra = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
HttpServletRequest req = sra.getRequest();
This uses thread-local under the covers.
这在幕后使用线程本地。
If you are using Spring MVC that's all you need. If you are not using Spring MVC then you will need to register a RequestContextListeneror RequestContextFilterin your web.xml.
如果您使用的是 Spring MVC，这就是您所需要的。如果你不使用Spring MVC的，那么你将需要注册一个RequestContextListener或RequestContextFilter两个你web.xml。
