Java "JSON中无分隔符日期字符串处理"

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




public class test {
    public static void main(String[] args)
    {
        String strDateTime="20150206201756";
        String strTime="201756";
        
        System.out.println(convJsonDateToString(strDateTime,"yyyy-MM-dd hh:mm:ss"));
        System.out.println(convJsonDateToString(strTime,"hhmmss","hh:mm:ss"));
    }
    public static String convJsonDateToString(String jsonDate,String stringTemplate){
        
        String resultString=null;
        try {
            Calendar cldCalendar=convToCalender(jsonDate, "yyyyMMddhhmmss");
            resultString=convToString(cldCalendar, stringTemplate);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return resultString;
    }
    public static String convJsonDateToString(String jsonDate,String jsonTemplate,String stringTemplate){
        
        String resultString=null;
        try {
            Calendar cldCalendar=convToCalender(jsonDate, jsonTemplate);
            resultString=convToString(cldCalendar, stringTemplate);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return resultString;
    }
    // 把指定格式的日期字符串转日期类型
    public static Calendar convToCalender(String str,String template){

        SimpleDateFormat sdf;
        Date date;
        Calendar cltResult = Calendar.getInstance();

        sdf = new SimpleDateFormat(template, Locale.getDefault());
        try {
            date = sdf.parse(str);

            cltResult.setTime(date);

        } catch (Exception ex) {
            // TODO Auto-generated catch block
            ex.printStackTrace();
        }

        return cltResult;
    }
    // 把日期转指定格式字符串
    public static String convToString(Calendar cld,String template){
        String resultString=null;
        try {
            Date date=cld.getTime();
            SimpleDateFormat sdf=new SimpleDateFormat(template,Locale.getDefault());
            resultString=sdf.format(date);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return resultString;
    }
}