有一个枚举类型的类：

?

public enum Gender {
	MAN{
		public String getName(){return "男";}
	},WOMEN{
		public String getName(){return "女";}
	};
	public abstract String getName();
}

?为他定义一个转换器：

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import org.apache.commons.beanutils.Converter;
import cn.aaron.bean.user.Gender;

public class GenderConverter implements Converter{

	@SuppressWarnings("unchecked")
	public Object convert(Class clazz, Object value) {
		if(value==null || "".equals((String)value)) return null;
		if(value instanceof Gender) return value;//如果要转换为枚举类型
		try{//如果要转换为String类型
			return Gender.valueOf((String) value);
		}catch (Exception e) {}
		return null;
	}
}

最后在Filter里面注册一下就行了：

?

public class SetCodeFilter implements Filter{

	public void destroy() {}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain filterchain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		req.setCharacterEncoding("UTF-8");
		filterchain.doFilter(request, response);
	}

	public void init(FilterConfig config) throws ServletException {
		ConvertUtils.register(new DateConverter(), Date.class);
		ConvertUtils.register(new SexConverter(), Sex.class);
		ConvertUtils.register(new GenderConverter(), Gender.class);//此处就是注册Gender转换器
		ConvertUtils.register(new DeliverWayConverter(), DeliverWay.class);
		ConvertUtils.register(new PaymentWayConverter(), PaymentWay.class);
		try{
			Properties prop = new Properties();
			prop.put("runtime.log", config.getServletContext().getRealPath("/WEB-INF/log/velocity.log"));
			prop.put("file.resource.loader.path", config.getServletContext().getRealPath("/WEB-INF/vm"));
			prop.put("input.encoding", "UTF-8");
			prop.put("output.encoding", "UTF-8");
			Velocity.init(prop);
		}catch( Exception e ){
			e.printStackTrace();
		}
	}
}