获取 POJO 类中的 Servlet Request 对象 [英] Get the Servlet Request object in a POJO class

问题描述

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URL 的子域(逻辑所基于的域).

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).

我尝试添加:

@Autowired
private HttpServletRequest request;

...

public void setRequest(HttpServletRequest request) {
    this.request = request;
}

public HttpServletRequest getRequest() {
    return request;
}

然而，当我尝试在我的代码中使用请求对象时，它为空.

However when I try to use the request object in my code, it is null.

知道我做错了什么，或者我怎样才能更好地做这件事吗?

Any idea what I am doing wrong or how I can better go about doing this?

推荐答案

如果 bean 是请求范围的，你可以像你正在做的那样自动装配 HttpServletRequest.

If the bean is request scoped you can autowire the HttpServletRequest like you are doing.

@Component
@Scope("request")
public class Foo {
    @Autowired private HttpServletRequest request;

    //
}

否则你可以按如下方式获取当前请求:

Otherwise you can get the current request as follows:

    ServletRequestAttributes sra = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
    HttpServletRequest req = sra.getRequest();     

这在幕后使用线程局部.

This uses thread-local under the covers.

如果您使用的是 Spring MVC，这就是您所需要的.如果你没有使用 Spring MVC 那么你需要注册一个 RequestContextListener 或 RequestContextFilter 在您的 web.xml 中.

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 RequestContextListener or RequestContextFilter in your web.xml.

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