apache.commons.beanutils转换器的使用

排第四偶家

　　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：

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();
}
}
}