package liuxiaobo.filter;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;public class EncodingFilter implements Filter {  protected FilterConfig filterConfig;  public void init(FilterConfig config) {    this.filterConfig = config;  }  public void destroy() {    this.filterConfig = null;  }  public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain)      throws IOException, ServletException{    String targetEncoding ="ISO8859-1";    targetEncoding = this.filterConfig.getInitParameter("encoding");    HttpServletRequest hrequest = (HttpServletRequest)request;    hrequest.setCharacterEncoding(targetEncoding);    filterChain.doFilter(request, response);  }}