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SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
//获取前一个月的第一天
Calendar cal_1=Calendar.getInstance();
//获取当前日期
cal_1.add(Calendar.MONTH, -1);
cal_1.set(Calendar.DAY_OF_MONTH,1);
//设置为1号,当前日期既为本月第一天
String firstDay = format.format(cal_1.getTime());
System.out.println("firstDay:"+firstDay);
//获取前一个月的最后一天
Calendar cale = Calendar.getInstance();
cale.set(Calendar.DAY_OF_MONTH,0);
//设置为1号,当前日期既为本月第一天
String lastDay = format.format(cale.getTime());
System.out.println("lastDay:"+lastDay);
//获取当前月第一天:
Calendar c = Calendar.getInstance();
c.add(Calendar.MONTH, 0);
c.set(Calendar.DAY_OF_MONTH,1);
//设置为1号,当前日期既为本月第一天
String first = format.format(c.getTime());
System.out.println("first:"+first);
//获取当前月最后一天
Calendar ca = Calendar.getInstance();
ca.set(Calendar.DAY_OF_MONTH,
ca.getActualMaximum(Calendar.DAY_OF_MONTH));
String last = format.format(ca.getTime());
System.out.println("last:"+last);
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