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

By calling the appropriate methods on the response parameter object. Which part of that would not be clear from the definition of the preHandle() method? — Andreas
– Andreas, Commented Sep 18, 2016 at 7:15

Arsen Davtyan · Accepted Answer · 2019-01-04 18:45:08Z

38

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.

edited Jan 4, 2019 at 18:45

answered Sep 18, 2016 at 7:02

Arsen Davtyan

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7 Comments

santosh kumar Over a year ago

still the body is not visible , i am only seeing statuscode. Am i doing anything wrong

Arsen Davtyan Over a year ago

What do you mean body is not visible?

santosh kumar Over a year ago

I mean i didnt get anything in response except status as errorcode that is send

Arsen Davtyan Over a year ago

When you use this method response.getWriter().write("something");, you'll get "something" message in the response body

Raja aar Over a year ago

i am getting default msg "error" instead of "something"(custom exception msg). Any help would be appreciated.

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