package tutorial;

 import java.util.Date;

 public class HelloWorld  {

     private Date birthday;

     public Date getBirthday() {

         return birthday;

     }

     public void setBirthday(Date birthday) {

         System.out.println(birthday);

         this.birthday = birthday;

     }

     public String execute(){

         return "success";

     }

     public String add(){

         return "success";

     }

 }

 package type;

 import java.text.SimpleDateFormat;

 import java.util.Date;

 import java.util.Map;

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

 public class DateTypeConverter extends DefaultTypeConverter {

     @Override

     public Object convertValue(Map<String, Object> context, Object value,

             Class toType) {

         SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmdd");

         try {

             if(toType == Date.class) { //字符串转Date类型

                 String[] param = (String[]) value;

                 return dateFormat.parse(param[0]);

             } else if (toType == String.class) { //Date转字符串

                 Date date = (Date) value;

                 return dateFormat.format(date);

             }

         }catch (java.text.ParseException e) {    }

         return null;

     }

 }