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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:
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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() { | |
} | |
} |
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