Hey I am new to spring and I need help on below:
I have interceptor with prehandle and posthandle mehtods in it.I want to send some values to handller from interceptor.
suggest any idea.
Thanks.
You can achieve this as:
In your interceptor prehandle method:
public boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler) throws Exception {
...
HttpSession session = request.getSession();
session.setAttribute("attributeName", objectYouWantToPassToHandler);
....
}
In your handler handleRequest method:
public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response) throws Exception {
....
HttpSession session = request.getSession();
objectYouWantToPassToHandler objectYouWantToPassToHandler = session.getAttribute("attributeName");
....
}
Actually, your question ins't clear, sorry. Try start from Spring AOP
And, of course, you have to show your code: what you have and what you want to do.
Related
I have a method in my SpringBoot app, in GenerateZipServiceImpl class:
#Override
public void generateZipFile(final Parameters parameters, final HttpServletResponse response){
...
...
...
}
In this method I get request body as an Parameters object called parameters and I generate zip with some files(using this parameters to generate files).
I want to write some unit tests for this method. But I couldn't understand how to use this HttpServletResponse here(. Maybe I have to use Mockito or I don't know.
Can someone give me any suggestions?
This is the endpoint where I execute this method in my controller:
#PostMapping("generate")
#ResponseStatus(HttpStatus.OK)
public void downloadZipFile(#RequestBody final Parameters parameter, final HttpServletResponse response) throws FileReadingException, IOException {
response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
response.setHeader(CONTENT_DISPOSITION, HEADER_VALUE_STR);
response.setStatus(HttpServletResponse.SC_OK);
this.generateZipServiceImpl.generateZipFile(parameter, response);
}
I am adding a header to the response inside HandlerInterceptorAdapter.
However it seems that the response header cannot be modified in the postHandle method.
public class CredentialInterceptor extends HandlerInterceptorAdapter {
#Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
return true;
}
#Override
public void postHandle(HttpServletRequest request,HttpServletResponse response,Object handler,ModelAndView modelAndView) {
String value = "...";
response.addHeader("header_name",value ); // doesn't work
}
}
How to add a header to the response ?
Popular solution is to use OncePerRequestFilter ( Set response header in Spring Boot ). Isn't there any other way ?
The problem with adding headers in the postHandle method is that the response may already be (partially) send. When that is the case you cannot add/change headers anymore. You need to set the headers before anything is sent to the client.
This you can do in the preHandle method or more generic a servlet filter before you call filterchain.doFilter. Doing it after the aforementioned call you might get the same issue that a response has already (partially) been sent.
I am building a small application in which I am trying to manage user login session.
My question is, is it possible to forward the http request from HandlerInterceptor.preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) method to controller
Something like this..
#Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
request.getRequestDispatcher("someController").forward(request, response);
return true;
}
I've read this suggestion on using #ModelAttribute for injecting parameters to the model globally. Is my understading correct, that such an approach will not cover views rendered by, e.g. <mvc:view-controller>, or a form-login custom login page?
If so, is there a way to extend such a mechanism to include all views?
Thanks
Ended-up using an Interceptor, as laid-out in this reply. Registered interceptor to intercept all non-resource endpoints (using mvc:exclude-mapping).
public class HandlerInterceptor extends HandlerInterceptorAdapter {
#Override
public void postHandle(HttpServletRequest request,
HttpServletResponse response,
Object handler,
ModelAndView modelAndView) throws Exception {
if (modelAndView == null)
return;
modelAndView.addObject("foo", "bar");
}
In MyLogoutHandler class I do override determineTargetUrl() method, here I am calling MyUserDetials userDetails = (MyUserDetials)userContextManager.getUserDetails(), but userDetails is null.
here is the configuration:
<security:logout
invalidate-session="true"
success-handler-ref="MyLogoutHandler"
logout-url="/auth/logout"/>
I noticed that since invalidate-session="true", it is null? but I like to keep this attribute "true", Can I have any other way to do configure?
My goal is: I need to pull some information from userDetails, to make a webservice call after user clicks logout.
Thank you.
You need create your own LogoutHandler, implement
void logout(HttpServletRequest request, HttpServletResponse response, Authentication authentication);
add it implementation to security:logout tag. After get user details from authentication parameter.
I fixed this issue. I created the My Own Handler and did override the:
public void onLogoutSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {...}
method of *SimpleUrlLogoutSuccessHandler*. Now I am able to get *authentication* object according to my spring configuration.
Thank you.