java 获取指定日期为星期几的代码

public String getWeekOfDate(Date dt) {

     String[] weekDays = {"日", "一", "二", "三", "四", "五", "六"};

     Calendar cal = Calendar.getInstance();

     cal.setTime(dt);

     int w = cal.get(Calendar.DAY_OF_WEEK) - 1;

     if (w < 0)

         w = 0;

     return weekDays[w];

 }