JSP Filter

package review;

import java.io.IOException;
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;

/**
 * Servlet Filter implementation class CharsetFilter
 */
public class CharsetFilter implements Filter {

 private String encoding;
 private FilterConfig fConfig;

 public void destroy() {
  // TODO Auto-generated method stub
  fConfig = null;
 }

 /**
  * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
  */
 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
 
  //post 방식일때만 지정?
  HttpServletRequest req = (HttpServletRequest)request;
 
  if(req.getMethod().equals("POST")) {
   req.setCharacterEncoding(encoding);
  }
 
  chain.doFilter(request, response);
 }

 /**
  * @see Filter#init(FilterConfig)
  */
 public void init(FilterConfig fConfig) throws ServletException {
  //설정 객체 저장
  this.fConfig = fConfig;
 
  //web.xml에 기록된 charset 파라미터 읽기
  encoding = fConfig.getInitParameter("charset");
 
  //만약 charset 파라미터가 없었다면 기본값 세팅
  if(encoding == null) {
   encoding = "ksc5601";
  }
 }

}