Calendar根据输入的年份和周数计算该周的开始日期和结束日期

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

public class test2 {

public static String getFirstDayOfWeek(int year, int week) {

Calendar firDay = Calendar.getInstance();

// 先滚动到该年
firDay.set(Calendar.YEAR, year);

// 滚动到周
firDay.set(Calendar.WEEK_OF_YEAR, week + 1);

  // 得到该周第一天
  firDay.set(Calendar.DAY_OF_WEEK, 2);

  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String firstDay = sdf.format(firDaya.getTime());

  return firstDay;
}

public static String getLastDayOfWeek(int year,int week){

  Calendar lasDay = Calendar.getInstance();

// 先滚动到该年
lasDay.set(Calendar.YEAR, year);

// 滚动到周
lasDay.set(Calendar.WEEK_OF_YEAR, week + 1);

// 得到该周第一天
lasDay.set(Calendar.DAY_OF_WEEK, 2);

// 得到该周最后一天
lasDay.add(Calendar.DAY_OF_WEEK, 4);

  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String lastDay = sdf.format(lasDay.getTime());

  return lastDay;
}

/**
* @param args
*/
public static void main(String[] args) {

System.out.print("第38周的星期一到星期五的日期是："+test2.getFirstDayOfWeek(2011, 1)+"——");

System.out.println(test2.getLastDayOfWeek(2011, 1));

}

运行结果：