java 在 Jersey 中是否可以访问注入的 HttpServletRequest 而不是代理
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Is it possible in Jersey to have access to an injected HttpServletRequest, instead of to a proxy
提问by Gerrit
When injecting HttpServletRequestin Jersey/JAX-RS resources, the injected value is a proxy. E.g.:
当注入HttpServletRequestJersey/JAX-RS 资源时，注入的值是一个代理。例如：
@Path("/myResource")
class MyResource {
@Inject
HttpServletRequest request;
...
}
Will inject a Proxyobject for the requested HttpServletRequest. I need access to the actual HttpServletRequestinstance object, because I want to use some container specific features that are not in the proxied HttpServletRequestinterface.
将为Proxy请求的HttpServletRequest. 我需要访问实际的HttpServletRequest实例对象，因为我想使用代理HttpServletRequest接口中没有的一些容器特定功能。
Is there a way in jersey to have access to the actual object via injection? I know that in older versions of Jersey you could inject a ThreadLocal<HttpServletRequest>to achieve this. But that doesn't seem to be supported in jersey 2.15 anymore.
球衣有没有办法通过注入访问实际对象？我知道在旧版本的 Jersey 中，您可以注入 aThreadLocal<HttpServletRequest>来实现这一点。但这似乎不再在球衣 2.15 中得到支持。
Rationale: My code depends on functionality in org.eclipse.jetty.server.Requestwhich implements HttpRequest, and adds functionality for HTTP/2 push. I would like to use that with Jersey/JAX-RS.
理由：我的代码依赖于功能性在org.eclipse.jetty.server.Request其实现HttpRequest，并为HTTP / 2推添加功能。我想将它与 Jersey/JAX-RS 一起使用。
回答by Paul Samsotha
Don't make your resource class a singleton. If you do this, there is no choice but to proxy, as the request is in a different scope.
不要让你的资源类成为单例。如果你这样做，除了代理别无选择，因为请求在不同的范围内。
@Singleton
@Path("servlet")
public class ServletResource {
@Context
HttpServletRequest request;
@GET
public String getType() {
return request.getClass().getName();
}
}
With @Singleton
和 @Singleton
C:\>curl http://localhost:8080/api/servletcom.sun.proxy.$Proxy41
C:\>curl http://localhost:8080/api/servletcom.sun.proxy.$Proxy41
Without @Singleton
没有 @Singleton
C:\>curl http://localhost:8080/api/servletorg.eclipse.jetty.server.Request
C:\>curl http://localhost:8080/api/servletorg.eclipse.jetty.server.Request
There are other ways your class can become a singleton, like registering it as an instance
您的类还有其他方法可以成为单例，例如将其注册为实例
You can aslo inject it as a method parameter. Singleton or not, you will get the actual instance
您也可以将其作为方法参数注入。单例与否，您将获得实际实例
@GET
public String getType(@Context HttpServletRequest request) {
return request.getClass().getName();
}
See Also
也可以看看
回答by Eric Ben
As Op said that
正如 Op 所说
I know that in older versions of Jersey you could inject a ThreadLocal to achieve this.
我知道在旧版本的 Jersey 中，您可以注入 ThreadLocal 来实现这一点。
I just want to add some code here which could implement this for those who are still using an older version of jersey like I do:
我只想在这里添加一些代码，这些代码可以为那些像我一样仍在使用旧版球衣的人实现这一点：
@Context ThreadLocal<HttpServletRequest> treq;
And a link for this:Thread access to @Context objects?Hope that would help.
还有一个链接：Thread access to @Context objects? 希望这会有所帮助。
