import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;
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;

import java.util.Map;

import org.codelibs.fess.unit.UnitFessTestCase;

public class EncodingFilterTest extends UnitFessTestCase {
    public void test_normal() throws IOException {
        final EncodingFilter filter = new EncodingFilter();
        Map<String, String[]> paramMap;

        paramMap = filter.parseQueryString("a=1", "UTF-8");
        assertEquals(1, paramMap.size());
        assertEquals("1", paramMap.get("a")[0]);

  <!--                                                                    ============== -->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.codelibs.fess.filter.EncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>