How to access HttpServletRequest inside Spring component class - spring-mvc

Question

I am trying to access httpServletRequest inside a component class. I tried it in several ways.
#Component
public class MyService{
#Resource
WebServiceContext wsCtxt;
public void myWebMethod(){
MessageContext msgCtxt = wsCtxt.getMessageContext();
HttpServletRequest req = (
(HttpServletRequest)msgCtxt.get(MessageContext.SERVLET_REQUEST);
String clientIP = req.getRemoteAddr();
}
This didn't work for me. because WebServiceContext is always null. Then I tried same code inside Web service class. Then that code is working. My Requirement it to get HttpServletRequest inside component class. (ultimately What i am trying to do it get client host from request header).
It this possible to do ?. Are there any alternatives for this ?

Answer 1

Method #1
Have you tried passing the request object into your component by passing it in as an argument to your service method, and from your service to your component method?
// in your controller... Spring provides the request object
public String myController(HttpServletRequest request, ...) {
//...
myService.myServiceMethod(request,...);
}
// in your service...
public void myServiceMethod(HttpServletRequest request, ...) {
//...
myComponent.myWebMethod(request,...);
}
// in your component
public String myWebMethod(HttpServletRequest request, ...) {
// use the raw request object
}
Method #2
Also, DispatcherServlet exposes the request object by wrapping it in a ServletRequestAttributes object, which in turn is stored in a ThreadLocal variable. The actual storing takes place in RequestContextHolder and its static methods. You can access it as follows:
public void myWebMethod(){
//...
RequestAttributes reqAttr = RequestContextHolder.getRequestAttributes();
ServletRequestAttributes servlReqAttr = (ServletRequestAttributes)reqAttr;
HttpServletRequest req = servlReqAttr.getRequest();
//...
}
Although a little verbose, you can see what's going on.
You could also condense it:
((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
I hope this helps!