Convert HttpServletResponse to String

Question

I am working in a spring boot application where I defined an interceptor. In the interceptor's "postHandle" method, I get a HttpServletRequest and HttpServletResponse. How can I convert the HttpServletResponse to a String?

Here is what I have tried so far:

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse res, Object o, ModelAndView mav) throws Exception {

OutputStream outputStream = res.getOutputStream();

///Convert this outputstream to String

}

This OutputStream is a ServletOutputstream. I can not convert it to BytearrayOutputStream. If i could do that, I could convert it to a String.

@Snehal Patel,i saw that question.but i am using interceptor not filter. — Iftekher Uddin Majumder
– Iftekher Uddin Majumder, Commented Feb 23, 2017 at 11:37

abhishek ringsia · Accepted Answer · 2019-09-04 17:55:38Z

There are 2 options to do it .1 -

public class MyFilter implements Filter {

public void init(FilterConfig filterConfig) throws ServletException {
}

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final ByteArrayPrintWriter pw = new ByteArrayPrintWriter(baos);

HttpServletResponse wrappedResp = new HttpServletResponseWrapper((HttpServletResponse) servletResponse) {
    @Override
    public PrintWriter getWriter() {
        return pw;
    }

    @Override
    public ServletOutputStream getOutputStream() {
        return new ServletOutputStream() {
            @Override
            public void write(int b) {
                baos.write(b);
            }
        };
    }
};

filterChain.doFilter(servletRequest, wrappedResp);
byte[] bytes = baos.toByteArray();
 String responseStr = new String(bytes);
servletResponse.getOutputStream().write(bytes);
}

 public void destroy() {}

 public static class ByteArrayPrintWriter extends PrintWriter {
 public ByteArrayPrintWriter(OutputStream out) {
    super(out);
 }
 }
 }

2 way is easy but work with spring-web-4*.jar version

HttpServletRequest request = (HttpServletRequest) servletRequest;
    HttpServletResponse response = (HttpServletResponse) servletResponse;
    ContentCachingRequestWrapper requestWrapper = new ContentCachingRequestWrapper(request);
    ContentCachingResponseWrapper responseWrapper = new ContentCachingResponseWrapper(response);

    Instant start = Instant.now();

    filterChain.doFilter(requestWrapper, responseWrapper);

    Instant finish = Instant.now();
    long timeElapsed = Duration.between(start, finish).toMillis();

    byte[] responseArray = responseWrapper.getContentAsByteArray();
    String responseStr = new String(responseArray, responseWrapper.getCharacterEncoding());

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