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@baberali
Created August 15, 2016 11:48
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Instead of writing your own classes to cache request response for logging, Spring provides a couple of useful classes i.e. ContentCachingRequestWrapper and ContentCachingResponseWrapper. These classes can be utilized very effectively, for example, in the following little filter:
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.util.ContentCachingRequestWrapper;
import org.springframework.web.util.ContentCachingResponseWrapper;
import org.springframework.web.util.WebUtils;
@Component
public class LoggingFilter implements Filter {
private static final Logger LOG = LoggerFactory.getLogger(LoggingFilter.class);
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain)
throws IOException, ServletException {
if (servletRequest instanceof HttpServletRequest
&& servletResponse instanceof HttpServletResponse) {
HttpServletRequest request = (HttpServletRequest) servletRequest;
HttpServletResponse response = (HttpServletResponse) servletResponse;
HttpServletRequest requestToCache = new ContentCachingRequestWrapper(request);
HttpServletResponse responseToCache = new ContentCachingResponseWrapper(response);
chain.doFilter(requestToCache, responseToCache);
String requestData = getRequestData(requestToCache);
String responseData = getResponseData(responseToCache);
} else {
chain.doFilter(servletRequest, servletResponse);
}
}
private static String getRequestData(final HttpServletRequest request) throws UnsupportedEncodingException {
String payload = null;
ContentCachingRequestWrapper wrapper = WebUtils.getNativeRequest(request, ContentCachingRequestWrapper.class);
if (wrapper != null) {
byte[] buf = wrapper.getContentAsByteArray();
if (buf.length > 0) {
payload = new String(buf, 0, buf.length, wrapper.getCharacterEncoding());
}
}
return payload;
}
private static String getResponseData(final HttpServletResponse response) throws IOException {
String payload = null;
ContentCachingResponseWrapper wrapper =
WebUtils.getNativeResponse(response, ContentCachingResponseWrapper.class);
if (wrapper != null) {
byte[] buf = wrapper.getContentAsByteArray();
if (buf.length > 0) {
payload = new String(buf, 0, buf.length, wrapper.getCharacterEncoding());
wrapper.copyBodyToResponse();
}
}
return payload;
}
@Override
public void destroy() {
}
}
@siiima
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siiima commented May 1, 2018

It was really helpful. thank you

@seetharamani
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@ozeta Thats what seems to be the case. When I try these in interceptors it does return empty wrapper. Works only in filters.

@cseli
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cseli commented Jun 22, 2018

Thanks, was truly helpful.

@shivam03164-zz
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Calling getRequestData(requestToCache); before filter chain gives a null body.

@drubioa
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drubioa commented Nov 22, 2019

Thanks, this code solved all my problems to log response body in my project.

@thedevhaider
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Hello guys, I tried the same but still giving me null in both requestData and responseData

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