scala时间处理

获取今天日期，昨天日期，本周时间，本月时间，时间戳转换日期，时间比较

分类： scala 2015-08-04 10:40 478人阅读 评论(0)收藏 举报

scala时间戳转换

因为做一个考勤系统，需要用到scala的时间和日期的处理，包括
获取今天日期，昨天日期，本周时间，本月时间，时间戳转换日期时间比较计算时间差等，特此总结了一下。

1、获取今天日期

<code class="language-scala hljs  has-numbering">  <span class="hljs-keyword">def</span> getNowDate():String={    <span class="hljs-keyword">var</span> now:Date = <span class="hljs-keyword">new</span> Date()    <span class="hljs-keyword">var</span>  dateFormat:SimpleDateFormat = <span class="hljs-keyword">new</span> SimpleDateFormat(<span class="hljs-string">"yyyy-MM-dd"</span>)    <span class="hljs-keyword">var</span> hehe = dateFormat.format( now )    hehe  }</code><ul style="display: block;" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li></ul>

2、获取昨天的日期

<code class="hljs python has-numbering">  <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">getYesterday</span><span class="hljs-params">()</span>:</span>String={    var  dateFormat:SimpleDateFormat = new SimpleDateFormat(<span class="hljs-string">"yyyy-MM-dd"</span>)    var cal:Calendar=Calendar.getInstance()    cal.add(Calendar.DATE,-<span class="hljs-number">1</span>)    var yesterday=dateFormat.format(cal.getTime())    yesterday</code><ul style="display: block;" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li></ul>

3、获取本周开始日期

<code class="language-scala hljs  has-numbering">  <span class="hljs-keyword">def</span> getNowWeekStart():String={    <span class="hljs-keyword">var</span> period:String=<span class="hljs-string">""</span>    <span class="hljs-keyword">var</span> cal:Calendar =Calendar.getInstance();    <span class="hljs-keyword">var</span> df:SimpleDateFormat = <span class="hljs-keyword">new</span> SimpleDateFormat(<span class="hljs-string">"yyyy-MM-dd"</span>);    cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY)     <span class="hljs-comment">//获取本周一的日期</span>    period=df.format(cal.getTime())    period  }</code><ul style="display: block;" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li></ul>

4、获取本周末的时间

<code class="hljs python has-numbering">  <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">getNowWeekEnd</span><span class="hljs-params">()</span>:</span>String={    var period:String=<span class="hljs-string">""</span>    var cal:Calendar =Calendar.getInstance();    var df:SimpleDateFormat = new SimpleDateFormat(<span class="hljs-string">"yyyy-MM-dd"</span>);    cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);//这种输出的是上个星期周日的日期，因为老外把周日当成第一天    cal.add(Calendar.WEEK_OF_YEAR, <span class="hljs-number">1</span>)// 增加一个星期，才是我们中国人的本周日的日期    period=df.format(cal.getTime())    period  }</code><ul style="display: block;" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li></ul>

5、本月的第一天

<code class="hljs python has-numbering">  <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">getNowMonthStart</span><span class="hljs-params">()</span>:</span>String={    var period:String=<span class="hljs-string">""</span>    var cal:Calendar =Calendar.getInstance();    var df:SimpleDateFormat = new SimpleDateFormat(<span class="hljs-string">"yyyy-MM-dd"</span>);    cal.set(Calendar.DATE, <span class="hljs-number">1</span>)    period=df.format(cal.getTime())//本月第一天    period  }</code><ul style="display: block;" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li></ul>

6、本月的最后一天

<code class="hljs python has-numbering">  <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">getNowMonthEnd</span><span class="hljs-params">()</span>:</span>String={    var period:String=<span class="hljs-string">""</span>    var cal:Calendar =Calendar.getInstance();    var df:SimpleDateFormat = new SimpleDateFormat(<span class="hljs-string">"yyyy-MM-dd"</span>);    cal.set(Calendar.DATE, <span class="hljs-number">1</span>)    cal.roll(Calendar.DATE,-<span class="hljs-number">1</span>)    period=df.format(cal.getTime())//本月最后一天    period  }</code><ul style="display: block;" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li></ul>

7、将时间戳转化成日期
时间戳是秒数，需要乘以1000l转化成毫秒

<code class="hljs python has-numbering">  <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">DateFormat</span><span class="hljs-params">(time:String)</span>:</span>String={    var sdf:SimpleDateFormat = new SimpleDateFormat(<span class="hljs-string">"yyyy-MM-dd"</span>)    var date:String = sdf.format(new Date((time.toLong*<span class="hljs-number">1000l</span>)))    date  }</code><ul style="display: block;" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li></ul>

8、时间戳转化为时间，原理同上

<code class="hljs python has-numbering">  <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">timeFormat</span><span class="hljs-params">(time:String)</span>:</span>String={    var sdf:SimpleDateFormat = new SimpleDateFormat(<span class="hljs-string">"HH:mm:ss"</span>)    var date:String = sdf.format(new Date((time.toLong*<span class="hljs-number">1000l</span>)))    date  }</code><ul style="display: block;" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li></ul>

测试一下

<code class="hljs scss has-numbering">def <span class="hljs-function">main(args: Array[String])</span> {    <span class="hljs-function">print(<span class="hljs-string">"现在时间："</span>+Tool.<span class="hljs-function">getNowDate()</span>)</span>    <span class="hljs-function">print(<span class="hljs-string">"昨天时间："</span>+Tool.<span class="hljs-function">getYesterday()</span>)</span>    <span class="hljs-function">print(<span class="hljs-string">"本周开始"</span>+Tool.<span class="hljs-function">getNowWeekStart()</span>)</span>    <span class="hljs-function">print(<span class="hljs-string">"本周结束"</span>+Tool.<span class="hljs-function">getNowWeekEnd()</span>)</span>    <span class="hljs-function">print(<span class="hljs-string">"本月开始"</span>+Tool.<span class="hljs-function">getNowMonthStart()</span>)</span>    <span class="hljs-function">print(<span class="hljs-string">"本月结束"</span>+Tool.<span class="hljs-function">getNowMonthEnd()</span>)</span>    <span class="hljs-function">print(<span class="hljs-string">"\n"</span>)</span>    <span class="hljs-function">print(Tool.<span class="hljs-function">timeFormat(<span class="hljs-string">"1436457603"</span>)</span>)</span>    <span class="hljs-function">print(Tool.<span class="hljs-function">DateFormat(<span class="hljs-string">"1436457603"</span>)</span>)</span>  }</code><ul style="display: block;" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li></ul>

10计算时间差

<code class="hljs lasso has-numbering">    <span class="hljs-comment">//核心工作时间，迟到早退等的的处理</span>    def getCoreTime(start_time:<span class="hljs-built_in">String</span>,end_Time:<span class="hljs-built_in">String</span>)<span class="hljs-subst">=</span>{      <span class="hljs-built_in">var</span> df:SimpleDateFormat<span class="hljs-subst">=</span><span class="hljs-literal">new</span> SimpleDateFormat(<span class="hljs-string">"HH:mm:ss"</span>)      <span class="hljs-built_in">var</span> begin:<span class="hljs-built_in">Date</span><span class="hljs-subst">=</span>df<span class="hljs-built_in">.</span>parse(start_time)      <span class="hljs-built_in">var</span> end:<span class="hljs-built_in">Date</span> <span class="hljs-subst">=</span> df<span class="hljs-built_in">.</span>parse(end_Time)      <span class="hljs-built_in">var</span> between:Long<span class="hljs-subst">=</span>(end<span class="hljs-built_in">.</span>getTime()<span class="hljs-attribute">-begin</span><span class="hljs-built_in">.</span>getTime())/<span class="hljs-number">1000</span><span class="hljs-comment">//转化成秒</span>      <span class="hljs-built_in">var</span> hour:Float<span class="hljs-subst">=</span>between<span class="hljs-built_in">.</span>toFloat/<span class="hljs-number">3600</span>      <span class="hljs-built_in">var</span> decf:DecimalFormat<span class="hljs-subst">=</span><span class="hljs-literal">new</span> DecimalFormat(<span class="hljs-string">"#.00"</span>)      decf<span class="hljs-built_in">.</span>format(hour)<span class="hljs-comment">//格式化</span>    }</code>