<init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>encodingRules</param-name>
      <param-value>sjis:Shift_JIS,eucjp:EUC-JP</param-value>
    </init-param>
  </filter>

  <filter>
    <filter-name>corsFilter</filter-name>

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

public class EncodingFilter implements Filter {
    public static final String ENCODING_MAP = "encodingRules";

    protected Map<String, String> encodingMap = new ConcurrentHashMap<>();

    protected String encoding;

    protected ServletContext servletContext;

    protected URLCodec urlCodec = new URLCodec();