Using Spring how do I get contents of HttpServletResponse in postHandle interceptor and in case of error redirect

Question

All my controllers return JSON response. As part of post handling how do I examine contents of JSON response and in case of errors how do I redirect. Thanks for your help.

Answer 1

The JSON operations in Spring are based on MappingJacksonHttpMessageConverter. If you want to log the result, extend it and override the write method OR use an aspect on this method:

@Aspect
 public class MyLogger {

   @Pointcut("execution(org.springframework.http.converter.AbstractHttpMessageConverter.write(..))")
   public void myPointCut() { }

   @AfterReturning(pointcut="myPointCut()",returning="result")
   public void logMethodEntry(JoinPoint jp) {
      ...
   }

}

To manage erors, you can use the ExceptionHandler annotation on your methods/classes:

@ExceptionHandler(YourException.class)
@ResponseStatus(value = HttpStatus.NOT_FOUND)
public Map<String, String> notFoundHandler(Exception e){
    return ...;
}

I hope this will help ;)