如何用java去操作“日期”函数，取得月初和月末

Question

如题所述

Answer 1

可以使用java.util.Calendar来取得相关日期信息，下面给个示例供参考：
Java代码：
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

public class DateDemo {

static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

public static void main(String[] args) throws ParseException {
String date = "2011-04-25 22:28:30";
System.out.println(date);
System.out.println("年份：" + getYear(date));
System.out.println("月份：" + getMonth(date));
System.out.println("日期：" + getDay(date));
System.out.println("月初日期是: " + getMinMonthDate(date));
System.out.println("月末日期是: " + getMaxMonthDate(date));
}

/**
* 获取日期年份
* @param date
* @return
* @throws ParseException
*/
public static int getYear(String date) throws ParseException{
Calendar calendar = Calendar.getInstance();
calendar.setTime(dateFormat.parse(date));
return calendar.get(Calendar.YEAR);
}

/**
* 获取日期月份
* @param date
* @return
* @throws ParseException
*/
public static int getMonth(String date) throws ParseException{
Calendar calendar = Calendar.getInstance();
calendar.setTime(dateFormat.parse(date));
return (calendar.get(Calendar.MONTH) + 1);
}

/**
* 获取日期号
* @param date
* @return
* @throws ParseException
*/
public static int getDay(String date) throws ParseException{
Calendar calendar = Calendar.getInstance();
calendar.setTime(dateFormat.parse(date));
return calendar.get(Calendar.DAY_OF_MONTH);
}
/**
* 获取月份起始日期
* @param date
* @return
* @throws ParseException
*/
public static String getMinMonthDate(String date) throws ParseException{
Calendar calendar = Calendar.getInstance();
calendar.setTime(dateFormat.parse(date));
calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMinimum(Calendar.DAY_OF_MONTH));
return dateFormat.format(calendar.getTime());
}

/**
* 获取月份最后日期
* @param date
* @return
* @throws ParseException
*/
public static String getMaxMonthDate(String date) throws ParseException{
Calendar calendar = Calendar.getInstance();
calendar.setTime(dateFormat.parse(date));
calendar.set(Calendar.DAY_OF_MONTH, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
return dateFormat.format(calendar.getTime());
}
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