my filter

package web.util;

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;

/**
 * 编码过滤器, 默认UTF-8
 * 
 * @author java-007
 * 
 */
public class EncodingFilter implements Filter {

	private String encoding = "UTF-8";

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		request.setCharacterEncoding(this.encoding);
		chain.doFilter(request, response);
	}

	public void init(FilterConfig config) throws ServletException {
		String encoding = config.getInitParameter("encoding");

		if (encoding != null && encoding.trim().length() > 0) {
			this.encoding = encoding;
		}
	}

}