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") }; //支持轉(zhuǎn)換的日期格式

    @Override
    public Object convertValue(Map context, Object value, Class toType) {
        if (toType == Date.class) {  //瀏覽器向服務器提交時，進行String to Date的轉(zhuǎn)換
            Date date = null;
            String dateString = null;
            String[] params = (String[])value;
            dateString = params[0];//獲取日期的字符串
            for (DateFormat format : ACCEPT_DATE_FORMATS) {
                try {
                    return format.parse(dateString);//遍歷日期支持格式，進行轉(zhuǎn)換
                } catch(Exception e) {
                    continue;
                }
            }
            return null;
        }
        else if (toType == String.class) {   //服務器向瀏覽器輸出時，進行Date to String的類型轉(zhuǎn)換
            Date date = (Date)value;
            return new SimpleDateFormat("yyyy-MM-dd").format(date);//輸出的格式是yyyy-MM-dd
        }

        return null;
    }
}