How to access HttpServletRequest inside Spring component class

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 ?

we are having a different environment such as test, dev, production. Current implementation of our project is to get default host as a localhost. but we can override host from vm options. like -Dserver_url=test.xxx.com , then web service will call other web services in test environment. Now we are going to get host from header which is sent through nginx. — Pubudu Jayasanka
– Pubudu Jayasanka, Commented Jun 15, 2018 at 5:14

NatFar · Accepted Answer · 2018-06-15 15:15:15Z

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!

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