Calendar c = Calendar.getInstance();
        long l = 1121385600000l;
        c.setTimeInMillis(l);
        System.out.println(c.getTime());

------解决方案--------------------

Java code

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


public class Test11 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Calendar c = Calendar.getInstance();
        long l = 1121385600000l;
        c.setTimeInMillis(l);
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd") ;
        System.out.println("格式化日期 ：" + sdf.format(c.getTime())) ;
        System.out.println("日期：" + c.getTime().toLocaleString());

    }

}