hutool 工具类使用 -java

1. //金额转为大写  结果为："陆万柒仟伍佰伍拾陆元叁角贰分"

   double a4 = 67556.32;
   String digitUppercase = Convert.digitToChinese(a4);

    

2. //转换为日期对象：

   String a = "2017-05-06";
   Date value = Convert.toDate(a);
   

   　　

3. 自定义数据转换

   //转换为集合
   Object[] a1 = {"a", "你", "好", "", 1};
   List<?> list = Convert.toList(a1);
   //其他自定义转换（class转换）
   Object[] a2 = { "a", "你", "好", "", 1 };
   List<String> list2 = Convert.convert(List.class, a);
   

   　　

4. 字符串处理

    //去除前缀和后缀//fileName -> pretty_girl
    String fileName = StrUtil.removeSuffix("pretty_girl.jpg", ".jpg");

   //二进制流与字符串的转换

   byte[] utf_8s = StrUtil.bytes(str, "UTF_8");
   //指定字符集获取Str
   String utf_8 = StrUtil.str(utf_8s, "UTF_8");

   //字符出按指定模板拼接
   String template = "{}爱{}，就像老鼠爱大米";
   String str11 = StrUtil.format(template, "我", "你"); //str -> 我爱你，就像老鼠爱大米

   //数组转为集合再按指定方式转为字符换
   String[] col= new String[]{"a","b","c","d","e"};
   List<String> colList = CollUtil.newArrayList(col);
   String str = CollUtil.join(colList, "','"); //str -> a#b#c#d#e
   str = "'"+str+"'";
   Console.log(str);

5. 时间处理相关

           //获取当前时间 2021-01-08 09:40:53(Date类型)
           Date date = DateUtil.date();
           //时间对象创建
           DateTime dateTime = new DateTime("2017-01-05 12:34:23", DatePattern.NORM_DATETIME_FORMAT);
           //获取当前时间 2021-01-08 09:42:37(String类型)
           String now = DateUtil.now();
           //获取当前时间 2021-01-08(String类型)
           String today= DateUtil.today();
           //String 转Date
           String dateStr = "2017-03-01";
           Date date01 = DateUtil.parse(dateStr, "yyyy-MM-dd");
           //Date 转String 2017/03/01
           String format = DateUtil.format(date01, "yyyy/MM/dd");
           //Date 转String
           String dateStr1231 = date01.toString();
           //获取年份
           DateUtil.year(date);
           //获取月份
           DateUtil.month(date);
           //获取时间差
           String dateStr1 = "2017-03-01 22:33:23";
           Date date1 = DateUtil.parse(dateStr1);
           String dateStr2 = "2017-04-01 23:33:23";
           Date date2 = DateUtil.parse(dateStr2);
           long between = DateUtil.between(date1, date2, DateUnit.DAY);
           //对时间差进行转换（31天1小时）
           String formatBetween = DateUtil.formatBetween(between, BetweenFormatter.Level.MINUTE);
           //时间偏移计算，结果：2017-03-03 22:33:23
           String dateStr01 = "2017-03-01 22:33:23";
           Date date0001 = DateUtil.parse(dateStr01);
           Date newDate = DateUtil.offset(date0001, DateField.DAY_OF_MONTH, 2);
           //时间偏移计算
           //昨天
           DateUtil.yesterday();
           //明天
           DateUtil.tomorrow();
           //上周
           DateUtil.lastWeek();
           //下周
           DateUtil.nextWeek();
           //上个月
           DateUtil.lastMonth();
           //下个月
           DateUtil.nextMonth();

    

6. map转实体

           //map转实体类（必须属性名对应才能复制）
           CopyBean cb = new CopyBean();
           Map<String,Object> map = new HashMap<>();
           map.put("reamak01","reamak01");
           map.put("reamak02","reamak02");
           map.put("money01","1.2324");
           map.put("money02","3.141513");
           BeanUtil.copyProperties(map, cb);
   
           //map转实体类（必须属性名对应才能复制）
           HashMap<String, Object> map002 = CollUtil.newHashMap();
           map002.put("name", "Joe");
           map002.put("age", 12);
           map002.put("openId", "DFDFSDFWERWER");
   
           CopyBean person = BeanUtil.fillBeanWithMap(map, new CopyBean(), false);
   
           //通过设置别名进行转换
           HashMap<String, Object> map01 = CollUtil.newHashMap();
           map01.put("a_name", "Joe");
           map01.put("b_age", 12);
           // 设置别名，用于对应bean的字段名
           HashMap<String, String> mapping = CollUtil.newHashMap();
           mapping.put("a_name", "name");
           mapping.put("b_age", "age");
           CopyBean p = BeanUtil.mapToBean(map, CopyBean.class, CopyOptions.create().setFieldMapping(mapping));
   
           //bean转Map
           Map<String, Object> map003 = BeanUtil.beanToMap(person);
   
           //bean转bean
           CopyBean cb1 = new CopyBean();
           CopyBean cb2 = new CopyBean();
           BeanUtil.copyProperties(cb1, cb2);