how to convert HTTPServletResponse into HttpEntity?

Question

In my project i have multiple API's(implemented using Spring REST API). Now i have this requirement that i have to manipulate the response in specific way before it is sent to client and changing it in every API method does not seems to be a good option.

Only solution i can think of is using servlet.Filter (by extending filter class)

 @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
            throws IOException, ServletException {
> chain.doFilter(req, res);

and write my logic after

chain.doFilter(req, res);

but i am struggling to convert ServletResponse or HTTPServletResponse into HttpEntity.

Please help me how can i achieve this ? and is there any better approach available ?

Thanks

UPDATE

@jny solution has helped me.

little code snippet to show how it works.

@ControllerAdvice(basePackages = { "com.test.controller" })   // package where it will look for the controllers.
public class ResponseFilter implements ResponseBodyAdvice<Object> {

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType,
            Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request,
            ServerHttpResponse response) {
        //here you can manipulate the body the way you want.
        return body;
    }

important is that your controller should be annotated with @ResponseBody

Can you add some more detail? What does the response look like before your proposed filter? What do you want it to look like? — woemler

jny jny · Accepted Answer · 2016-02-09T14:43:09

It depends on what exactly you need. If you need to make changes of the body of the response, if you use Spring 4.1 or higher, you can use ResponseBodyAdvice to manipulate the body of the response.

If you need to filter certain fields, there are other options available. From documentation:

Implementations may be may be registered directly with RequestMappingHandlerAdapter and ExceptionHandlerExceptionResolver or more likely annotated with @ControllerAdvice in which case they will be auto-detected by both.

how to convert HTTPServletResponse into HttpEntity?

2 Answers