springboot : how to return error status code in prehandle of HandlerInterceptor

Question

I am using HandlerInterceptor in Spring Boot for processing common types of requests. But while executing preHandle, I want to return error status code to user if conditions are not met. If i throw the exception inside preHandle the response will have all the exception stack. How to send custom body as response with response code from preHandle

Answer 1

If conditions are not met, you can use response.setStatus(someErrorCode) to set the response status code and return false to stop execution. To send custom body you can use the following method: response.getWriter().write("something");

Here is the full example.

@Override
public boolean preHandle(HttpServletRequest request,
    HttpServletResponse response, Object handler) throws Exception {

    if (conditionsNotMet()) {
        response.getWriter().write("something");
        response.setStatus(someErrorCode);

        return false;
    }

    return true;
} 

Hope this helps.