Java实现数字的千分位的处理

前言：

最近在做财务系统的开发功能，要求在导出的word文档里面的数字，要以千分位的格式处理显示，于是写了一下下面的方法，希望可以帮助到需要的小伙伴

/**

* 格式化数字为千分位显示；

* @param

* @return

*/

public static String fmtMicrometer(String text)

{

DecimalFormat df = null;

if(text.indexOf(".") > 0)

{

if(text.length() - text.indexOf(".")-1 == 0)

{

df = new DecimalFormat("###,##0.");

}else if(text.length() - text.indexOf(".")-1 == 1)

{

df = new DecimalFormat("###,##0.0");

}else if(text.length() - text.indexOf(".")-1 == 2)

{

df = new DecimalFormat("###,##0.00");

}else if(text.length() - text.indexOf(".")-1 == 3)

{

df = new DecimalFormat("###,##0.000");

}else if(text.length() - text.indexOf(".")-1 == 4)

{

df = new DecimalFormat("###,##0.0000");

}else if(text.length() - text.indexOf(".")-1 == 5)

{

df = new DecimalFormat("###,##0.00000");

}

}else

{

df = new DecimalFormat("###,##0");

}

double number = 0.0;

try {

number = Double.parseDouble(text);

} catch (Exception e) {

number = 0.0;

}

return df.format(number);

}

上面的代码主要进行判断小数点的位置，以及小数点前的位置进行格式化的处理，具体的方法：DecimalFormat

/**

* Creates a DecimalFormat using the given pattern and the symbols

* for the default {@link java.util.Locale.Category#FORMAT FORMAT} locale.

* This is a convenient way to obtain a

* DecimalFormat when internationalization is not the main concern.

* <p>

* To obtain standard formats for a given locale, use the factory methods

* on NumberFormat such as getNumberInstance. These factories will

* return the most appropriate sub-class of NumberFormat for a given

* locale.

*

* @param pattern a non-localized pattern string.

* @exception NullPointerException if <code>pattern</code> is null

* @exception IllegalArgumentException if the given pattern is invalid.

* @see java.text.NumberFormat#getInstance

* @see java.text.NumberFormat#getNumberInstance

* @see java.text.NumberFormat#getCurrencyInstance

* @see java.text.NumberFormat#getPercentInstance

*/

public DecimalFormat(String pattern) {

// Always applyPattern after the symbols are set

this.symbols = DecimalFormatSymbols.getInstance(Locale.getDefault(Locale.Category.FORMAT));

applyPattern(pattern, false);

}

占位符的处理；