Ich versuche, den Content-Type-Header in einer Anfrage zu ändern und ändern Sie es in "Anwendung/Json", bevor es meine Feder Ruhe-Controller erreicht. Ich habe einen Servlet Request Wrapper erstellt, um die Werte zu ändern, aber wenn die Anfrage den Controller erreicht, ist es immer noch "text/plain". Die Protokollierung zeigt, dass der Header-Wert geändert wurde, bevor doFilter() angeklickt wurde.Servlet Filter ändern Header-Wert mit Servlet Request Wrapper funktioniert nicht
Hier ist meine Klasse HttpServletRequestWrapper
class HttpServletRequestWritableWrapper extends HttpServletRequestWrapper {
private final Logger logger = org.slf4j.LoggerFactory.getLogger(HttpServletRequestWritableWrapper.class);
private final ByteArrayInputStream decryptedBody;
HttpServletRequestWritableWrapper(HttpServletRequest request, byte[] decryptedData) {
super(request);
decryptedBody = new ByteArrayInputStream(decryptedData);
}
@Override
public String getHeader(String name) {
String headerValue = super.getHeader(name);
if("Accept".equalsIgnoreCase(name))
{
logger.debug("Accept header changing :");
return headerValue.replaceAll(
MediaType.TEXT_PLAIN_VALUE, MediaType.APPLICATION_JSON_VALUE
);
}
else if ("Content-Type".equalsIgnoreCase(name))
{
logger.debug("Content type change: ");
return headerValue.replaceAll(MediaType.TEXT_PLAIN_VALUE, MediaType.APPLICATION_JSON_VALUE);
}
return headerValue;
}
@Override
public Enumeration<String> getHeaderNames() {
return super.getHeaderNames();
}
@Override
public String getContentType() {
String contentTypeValue = super.getContentType();
if (MediaType.TEXT_PLAIN_VALUE.equalsIgnoreCase(contentTypeValue)) {
logger.debug("Changing on getContentType():");
return MediaType.APPLICATION_JSON_VALUE;
}
return contentTypeValue;
}
@Override
public BufferedReader getReader() throws UnsupportedEncodingException {
return new BufferedReader(new InputStreamReader(decryptedBody, UTF_8));
}
@Override
public ServletInputStream getInputStream() throws IOException {
return new ServletInputStream() {
@Override
public int read() {
return decryptedBody.read();
}
};
}
erstreckt, und hier ist mein Filter:
@WebFilter(displayName = "EncryptionFilter", urlPatterns = "/*")
public class EncryptionFilter implements Filter {
private final Logger logger = org.slf4j.LoggerFactory.getLogger(EncryptionFilter.class);
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
byte[] data = "{\"currentClientVersion\":{\"majorElement\":\"1\",\"minorElement\":\"2\"}}".getBytes();
logger.debug("data string " + data.toString());
logger.debug("Content-type before: " + servletRequest.getContentType());
HttpServletRequest request = (HttpServletRequest) servletRequest;
HttpServletRequestWritableWrapper requestWrapper = new HttpServletRequestWritableWrapper(request, data);
//logger.debug("Accept Header: " + requestWrapper.getHeader("Accept"));
//logger.debug("Content-Type: " + requestWrapper.getHeader("Content-Type"));
//logger.debug("Contenttype" + requestWrapper.getContentType());
filterChain.doFilter(requestWrapper, servletResponse);
}
@Override
public void destroy() {
}
}