如何解决struts2日期类型转换

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

import com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter;

public class DateConverter extends DefaultTypeConverter {
    private static final DateFormat[] ACCEPT_DATE_FORMATS = {
            new SimpleDateFormat("dd/MM/yyyy"),
            new SimpleDateFormat("yyyy-MM-dd"),
            new SimpleDateFormat("yyyy/MM/dd") }; //支持转换的日期格式

    @Override
    public Object convertValue(Map context, Object value, Class toType) {
        if (toType == Date.class) {  //浏览器向服务器提交时，进行String to Date的转换
            Date date = null;
            String dateString = null;
            String[] params = (String[])value;
            dateString = params[0];//获取日期的字符串
            for (DateFormat format : ACCEPT_DATE_FORMATS) {
                try {
                    return format.parse(dateString);//遍历日期支持格式，进行转换
                } catch(Exception e) {
                    continue;
                }
            }
            return null;
        }
        else if (toType == String.class) {   //服务器向浏览器输出时，进行Date to String的类型转换
            Date date = (Date)value;
            return new SimpleDateFormat("yyyy-MM-dd").format(date);//输出的格式是yyyy-MM-dd
        }

        return null;
    }
}