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【Java】日期方法
作者: / 发布于2011/1/14/ 515
<div><span style="color: #0000ff">import</span><span style="color: #000000"> java.text.SimpleDateFormat;
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.Calendar;

</span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> DateUtil
{

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 格式化日期
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> dateStr
 * 字符型日期
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> format
 * 格式
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回日期
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> java.util.Date parseDate(String dateStr, String format)
 {
 java.util.Date date </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
 </span><span style="color: #0000ff">try</span><span style="color: #000000">
 {
 java.text.DateFormat df </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> java.text.SimpleDateFormat(format);
 String dt </span><span style="color: #000000">=</span><span style="color: #000000"> dateStr.replaceAll(</span><span style="color: #000000">"</span><span style="color: #000000">-</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">/</span><span style="color: #000000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> ((</span><span style="color: #000000">!</span><span style="color: #000000">dt.equals(</span><span style="color: #000000">""</span><span style="color: #000000">)) </span><span style="color: #000000">&&</span><span style="color: #000000"> (dt.length() </span><span style="color: #000000"><</span><span style="color: #000000"> format.length()))
 {
 dt </span><span style="color: #000000">+=</span><span style="color: #000000"> format.substring(dt.length()).replaceAll(</span><span style="color: #000000">"</span><span style="color: #000000">[YyMmDdHhSs]</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">0</span><span style="color: #000000">"</span><span style="color: #000000">);
 }
 date </span><span style="color: #000000">=</span><span style="color: #000000"> (java.util.Date) df.parse(dt);
 }
 </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (Exception e)
 {
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> date;
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> dateStr
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> Date
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> java.util.Date parseDate(String dateStr)
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> parseDate(dateStr, </span><span style="color: #000000">"</span><span style="color: #000000">yyyy/MM/dd</span><span style="color: #000000">"</span><span style="color: #000000">);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 格式化输出日期
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> format
 * 格式
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回字符型日期
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String format(java.util.Date date, String format)
 {
 String result </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">""</span><span style="color: #000000">;
 </span><span style="color: #0000ff">try</span><span style="color: #000000">
 {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (date </span><span style="color: #000000">!=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">)
 {
 java.text.DateFormat df </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> java.text.SimpleDateFormat(format);
 result </span><span style="color: #000000">=</span><span style="color: #000000"> df.format(date);
 }
 }
 </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (Exception e)
 {
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result;
 }

 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String format(java.util.Date date)
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> format(date, </span><span style="color: #000000">"</span><span style="color: #000000">yyyy/MM/dd</span><span style="color: #000000">"</span><span style="color: #000000">);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 返回年份
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回年份
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> getYear(java.util.Date date)
 {
 java.util.Calendar c </span><span style="color: #000000">=</span><span style="color: #000000"> java.util.Calendar.getInstance();
 c.setTime(date);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> c.get(java.util.Calendar.YEAR);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 返回月份
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回月份
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> getMonth(java.util.Date date)
 {
 java.util.Calendar c </span><span style="color: #000000">=</span><span style="color: #000000"> java.util.Calendar.getInstance();
 c.setTime(date);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> c.get(java.util.Calendar.MONTH) </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">1</span><span style="color: #000000">;
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 返回日份
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回日份
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> getDay(java.util.Date date)
 {
 java.util.Calendar c </span><span style="color: #000000">=</span><span style="color: #000000"> java.util.Calendar.getInstance();
 c.setTime(date);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> c.get(java.util.Calendar.DAY_OF_MONTH);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 返回小时
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回小时
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> getHour(java.util.Date date)
 {
 java.util.Calendar c </span><span style="color: #000000">=</span><span style="color: #000000"> java.util.Calendar.getInstance();
 c.setTime(date);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> c.get(java.util.Calendar.HOUR_OF_DAY);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 返回分钟
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回分钟
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> getMinute(java.util.Date date)
 {
 java.util.Calendar c </span><span style="color: #000000">=</span><span style="color: #000000"> java.util.Calendar.getInstance();
 c.setTime(date);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> c.get(java.util.Calendar.MINUTE);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 返回秒钟
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回秒钟
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> getSecond(java.util.Date date)
 {
 java.util.Calendar c </span><span style="color: #000000">=</span><span style="color: #000000"> java.util.Calendar.getInstance();
 c.setTime(date);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> c.get(java.util.Calendar.SECOND);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 返回毫秒
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回毫秒
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">long</span><span style="color: #000000"> getMillis(java.util.Date date)
 {
 java.util.Calendar c </span><span style="color: #000000">=</span><span style="color: #000000"> java.util.Calendar.getInstance();
 c.setTime(date);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> c.getTimeInMillis();
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 返回字符型日期
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回字符型日期
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String getDate(java.util.Date date)
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> format(date, </span><span style="color: #000000">"</span><span style="color: #000000">yyyy/MM/dd</span><span style="color: #000000">"</span><span style="color: #000000">);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 返回字符型时间
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回字符型时间
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String getTime(java.util.Date date)
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> format(date, </span><span style="color: #000000">"</span><span style="color: #000000">HH:mm:ss</span><span style="color: #000000">"</span><span style="color: #000000">);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 返回字符型日期时间
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回字符型日期时间
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String getDateTime(java.util.Date date)
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> format(date, </span><span style="color: #000000">"</span><span style="color: #000000">yyyy/MM/dd HH:mm:ss</span><span style="color: #000000">"</span><span style="color: #000000">);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 日期相加
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> day
 * 天数
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回相加后的日期
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> java.util.Date addDate(java.util.Date date, </span><span style="color: #0000ff">int</span><span style="color: #000000"> day)
 {
 java.util.Calendar c </span><span style="color: #000000">=</span><span style="color: #000000"> java.util.Calendar.getInstance();
 c.setTimeInMillis(getMillis(date) </span><span style="color: #000000">+</span><span style="color: #000000"> ((</span><span style="color: #0000ff">long</span><span style="color: #000000">) day) </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">24</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">3600</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">1000</span><span style="color: #000000">);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> c.getTime();
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 日期相减
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * 日期
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date1
 * 日期
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 返回相减后的日期
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">int</span><span style="color: #000000"> diffDate(java.util.Date date, java.util.Date date1)
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> (</span><span style="color: #0000ff">int</span><span style="color: #000000">) ((getMillis(date) </span><span style="color: #000000">-</span><span style="color: #000000"> getMillis(date1)) </span><span style="color: #000000">/</span><span style="color: #000000"> (</span><span style="color: #000000">24</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">3600</span><span style="color: #000000"> </span><span style="color: #000000">*</span><span style="color: #000000"> </span><span style="color: #000000">1000</span><span style="color: #000000">));
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 取得指定月份的第一天
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> strdate
 * String
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> String
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String getMonthBegin(String strdate)
 {
 java.util.Date date </span><span style="color: #000000">=</span><span style="color: #000000"> parseDate(strdate);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> format(date, </span><span style="color: #000000">"</span><span style="color: #000000">yyyy-MM</span><span style="color: #000000">"</span><span style="color: #000000">) </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000">-01</span><span style="color: #000000">"</span><span style="color: #000000">;
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 取得指定月份的最后一天
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> strdate
 * String
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> String
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String getMonthEnd(String strdate)
 {
 java.util.Date date </span><span style="color: #000000">=</span><span style="color: #000000"> parseDate(getMonthBegin(strdate));
 Calendar calendar </span><span style="color: #000000">=</span><span style="color: #000000"> Calendar.getInstance();
 calendar.setTime(date);
 calendar.add(Calendar.MONTH, </span><span style="color: #000000">1</span><span style="color: #000000">);
 calendar.add(Calendar.DAY_OF_YEAR, </span><span style="color: #000000">-</span><span style="color: #000000">1</span><span style="color: #000000">);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> formatDate(calendar.getTime());
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 常用的格式化日期
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * Date
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> String
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String formatDate(java.util.Date date)
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> formatDateByFormat(date, </span><span style="color: #000000">"</span><span style="color: #000000">yyyy-MM-dd</span><span style="color: #000000">"</span><span style="color: #000000">);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 以指定的格式来格式化日期
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> date
 * Date
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> format
 * String
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> String
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String formatDateByFormat(java.util.Date date, String format)
 {
 String result </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">""</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (date </span><span style="color: #000000">!=</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">)
 {
 </span><span style="color: #0000ff">try</span><span style="color: #000000">
 {
 SimpleDateFormat sdf </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> SimpleDateFormat(format);
 result </span><span style="color: #000000">=</span><span style="color: #000000"> sdf.format(date);
 }
 </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (Exception ex)
 {
 ex.printStackTrace();
 }
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result;
 }

}</span>
</div>
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