package com.example.demo;import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {@Testpublic void contextLoads() {setMonth("2018年02月");}private Date str2Date(String str) {try {SimpleDateFormat df = new SimpleDateFormat("yyyy年MM月");return df.parse(str);} catch (Exception e) {e.printStackTrace();return null;}}/*** 设置月份*/private void setMonth(String Month) {Date month = str2Date(Month);boolean isCurrentMonth = false;Calendar calendar = Calendar.getInstance();calendar.setTime(new Date());//获取今天是多少号int currentDay = calendar.get(Calendar.DAY_OF_MONTH);int todayWeekIndex = calendar.get(Calendar.DAY_OF_WEEK) - 1;Date cM = str2Date(getMonthStr(new Date()));//判断是否为当月if (cM.getTime() == month.getTime()) {isCurrentMonth = true;int selectDay = currentDay;//当月默认选中当前日} else {isCurrentMonth = false;int selectDay = 0;}System.out.println("设置月份：" + getMonthStr(month) + "   今天" + currentDay + "号, 是否为当前月：" + isCurrentMonth);calendar.setTime(month);int dayOfMonth = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);//第一行1号显示在什么位置（星期几）int firstIndex = calendar.get(Calendar.DAY_OF_WEEK) - 1;int lineNum = 1;//第一行能展示的天数int firstLineNum = 7 - firstIndex;int lastLineNum = 0;int shengyu = dayOfMonth - firstLineNum;while (shengyu > 7) {lineNum++;shengyu -= 7;}if (shengyu > 0) {lineNum++;lastLineNum = shengyu;}System.out.println(getMonthStr(month) + "月一共有" + dayOfMonth + "天,第一天的索引是：" + firstIndex + "   有" + lineNum +"行，第一行" + firstLineNum + "个，最后一行" + lastLineNum + "个");int days[][] = new int[5][7];String weeks[] = {"星期-", "星期二", "星期三", "星期四", "星期五"};for (int day = 0; day < dayOfMonth; day++) {int column = (day + firstIndex) % 7;int row = (day + firstIndex) / 7;days[row][column] = day + 1;}for (int i = 0; i < weeks.length; i++) {System.out.print(weeks[i] + "\t");}System.out.println();for (int i = 0; i < days.length; i++) {for (int j = 0; j < days[i].length; j++) {if (days[i][j] == 0)System.out.print("\t");elseSystem.out.print(days[i][j] + "\t");}System.out.println();}}/*** 获取月份标题*/private String getMonthStr(Date month) {SimpleDateFormat df = new SimpleDateFormat("yyyy年MM月");return df.format(month);}}