字符过滤器工具类

package com.util;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import javax.servlet.*;import java.io.IOException;public class EncodingFilter implements Filter {private Log log = LogFactory.getLog(getClass());private String encoding = "UTF-8";public void destroy() {log.info("EncodingFilter destroyed.");}public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {request.setCharacterEncoding(encoding);chain.doFilter(request, response);    }public void init(FilterConfig filterConfig) throws ServletException {String encoding = filterConfig.getInitParameter("encoding");if (encoding != null && !"".equals(encoding.trim()))this.encoding = encoding.trim();log.info("Request character encoding is set to " + encoding);}}