JAVA中json日期格式问题的办法

package cn.jbit.BookSys.util;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import net.sf.json.JsonConfig;
import net.sf.json.processors.JsonValueProcessor;

public class JsonDateValueProcessor implements JsonValueProcessor{
     private String format ="yyyy-MM-dd";  
     
        public JsonDateValueProcessor() {  
            super();  
        }  
          
        public JsonDateValueProcessor(String format) {  
            super();  
            this.format = format;  
        }  
      
        @Override
        public Object processArrayValue(Object value, JsonConfig jsonConfig) {
            // TODO Auto-generated method stub
             String[] obj = {};  
                if (value instanceof Date[])  
                {  
                    SimpleDateFormat sf = new SimpleDateFormat(format);  
                    Date[] dates = (Date[]) value;  
                    obj = new String[dates.length];  
                    for (int i = 0; i < dates.length; i++)  
                    {  
                        obj[i] = sf.format(dates[i]);  
                    }  
                }  
                return obj;  
        }

        @Override
        public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {
            // TODO Auto-generated method stub
            if (value instanceof Date)  
            {  
                String str = new SimpleDateFormat(format).format((Date) value);  
                return str;  
            }  
            return value;  
        }
         public String getFormat()  
            {  
                return format;  
            }  
          
            public void setFormat(String format)  
            {  
                this.format = format;  
            }  

}