filter 를 이용한 한글처리

--web.xml-------------------------------------------------------------------------

 

<web-app>
  <filter>
      <filter-name>encoder</filter-name>
      <filter-class>utils.hangle.EncodingFilter</filter-class>
      <init-param>
          <param-name>encoding</param-name>
          <param-value>euc-kr</param-value>
      </init-param>
  </filter>
  <filter-mapping>
   <filter-name>encoder</filter-name>
   <servlet-name>action</servlet-name>
  </filter-mapping>

</web-app>

 

--EncodingFilter.java---------------------------------------------------------------

 

package utils.hangle;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

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 org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * EncodingFilter.java
 * @web:filter
 *      name = "encoder"
 * @web:filter-init-param
 *      name = "encoding"
 *      value = "euc-kr"
 * @web:filter-mapping
 *      url-pattern = "*.jsp"
 */
public class EncodingFilter implements Filter {

    private static Log log = LogFactory.getLog(EncodingFilter.class);

    private boolean enabled = true;
    private String encoding;

    /**
     * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
     */
    public void init(final FilterConfig config) throws ServletException {
        this.encoding = config.getInitParameter("encoding");

        if (log.isInfoEnabled()) {
            log.info("Encoding filter has been initialized : " + encoding);
        }
    }

    /**
     * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest,
     *           javax.servlet.ServletResponse, javax.servlet.FilterChain)
     */
    public void doFilter(
            final ServletRequest request,
            final ServletResponse response,
            final FilterChain chain) throws IOException, ServletException {
        if (enabled && (encoding != null)) {
            try {
                request.setCharacterEncoding(encoding);
            } catch (UnsupportedEncodingException e) {
                if (log.isWarnEnabled()) {
                    log.warn("Encoding filter has been disabled.", e);
                }

                this.enabled = false;
            }
        }

        chain.doFilter(request, response);
    }

    /**
     * @see javax.servlet.Filter#destroy()
     */
    public void destroy() {
        if (log.isInfoEnabled()) {
            log.info("Encoding filter has been destoryed.");
        }
    }
}