問題描述
我想在我們的 jsp 頁面中格式化一些數字.
首先，我在我的屬性中定義了一些資源format.number.with2Decimal={0,number,#0.00}
......
問題1:
我想知道‘#’和‘0’是什么意思?
0.00,#0.00,##.00,###0.00
誰能告訴我它們之間的區別?謝謝！
問題2:
如果我在操作中定義 BigDecimal 類型BigDecimal number1;
那么我的頁面應該使用一種格式來顯示這個值，1.if number1=null then show -NIL-2.if number1=0 then show -NIL-3.if number1>0 then show 1.00,3434.98 .....
請忽略數字<0
問題3:
將 number1 更改為字符串，1.如果 number1=null 或為空或空白則顯示 -NIL-2.if number1=Hello then show Hello ....
你能幫我嗎?
問題1:我想知道'
#'和'0'是什么意思?0.00,#0.00,##.00,###0.00誰能告訴我它們之間的區別?謝謝！
0表示必須打印一個數字，不管它是否存在#表示一個數字如果存在則必須打印，否則省略.
例子:
System.out.println("假設美國語言環境:" +"',' 作為千位分隔符，" +'.'作為小數分隔符");NumberFormat nf = new DecimalFormat("#,##0.0##");System.out.println("
===============================");System.out.println("帶格式(#,##0.0##)");System.out.println("------------------");System.out.println("1234.0 = " + nf.format(1234.0));System.out.println("123.4 = " + nf.format(123.4));System.out.println("12.34 = " + nf.format(12.34));System.out.println("1.234 = " + nf.format(1.234));System.out.println("==============================");nf = new DecimalFormat("#,000.000");System.out.println("
===============================");System.out.println("帶格式(#,000.000)");System.out.println("------------------");System.out.println("1234.0 = " + nf.format(1234.0));System.out.println("123.4 = " + nf.format(123.4));System.out.println("12.34 = " + nf.format(12.34));System.out.println("1.234 = " + nf.format(1.234));System.out.println("==============================");運行示例
輸出:
<塊引用>假設美國語言環境:',' 作為千位分隔符，'.'作為小數分隔符)===============================帶格式 (#,##0.0##)------------------------------1234.0 = 1,234.0123.4 = 123.412.34 = 12.341.234 = 1.234==============================================================帶格式 (#,000.000)------------------------------1234.0 = 1,234.000123.4 = 123.40012.34 = 012.3401.234 = 001.234===============================在 Struts2 中，您可以使用 ActionSupport 中的 getText() 函數應用這種格式.
P.S:問題 2 和 3 很瑣碎(而且很混亂).
I want to format some numbers in our jsp pages.
first i define some resources in my porperties
format.number.with2Decimal={0,number,#0.00}
......
Question1:
i want to know what is the ‘#’ and '0' means?
0.00,#0.00,##.00,###0.00
who can tell me the differences between them? thanks!
Question2:
if i define a BigDecimal type in my action
BigDecimal number1;
Then my page should using a format to show this value,
1.if number1=null then show -NIL-
2.if number1=0 then show -NIL-
3.if number1>0 then show 1.00,3434.98 .....
please ignore number<0
Question3:
change number1 to a String,
1.if number1=null or empty or blank then show -NIL-
2.if number1=Hello then show Hello ....
could you give me help?
Question1: i want to know what is the ‘
#’ and '0' means?0.00,#0.00,##.00,###0.00who can tell me the differences between them? thanks!
0means that a number must be printed, no matter if it exists#means that a number must be printed if it exists, omitted otherwise.
Example:
System.out.println("Assuming US Locale: " +
"',' as thousand separator, " +
"'.' as decimal separator ");
NumberFormat nf = new DecimalFormat("#,##0.0##");
System.out.println("
==============================");
System.out.println("With Format (#,##0.0##) ");
System.out.println("------------------------------");
System.out.println("1234.0 = " + nf.format(1234.0));
System.out.println("123.4 = " + nf.format(123.4));
System.out.println("12.34 = " + nf.format(12.34));
System.out.println("1.234 = " + nf.format(1.234));
System.out.println("==============================");
nf = new DecimalFormat("#,000.000");
System.out.println("
==============================");
System.out.println("With Format (#,000.000) ");
System.out.println("------------------------------");
System.out.println("1234.0 = " + nf.format(1234.0));
System.out.println("123.4 = " + nf.format(123.4));
System.out.println("12.34 = " + nf.format(12.34));
System.out.println("1.234 = " + nf.format(1.234));
System.out.println("==============================");
Running Example
Output:
Assuming US Locale: ',' as thousand separator, '.' as decimal separator) ============================== With Format (#,##0.0##) ------------------------------ 1234.0 = 1,234.0 123.4 = 123.4 12.34 = 12.34 1.234 = 1.234 ============================== ============================== With Format (#,000.000) ------------------------------ 1234.0 = 1,234.000 123.4 = 123.400 12.34 = 012.340 1.234 = 001.234 ==============================
In Struts2, you can apply this kind of format with the getText() function from ActionSupport.
P.S: Question 2 and 3 are trivial (and messy).
這篇關于使用 Struts2 標簽格式化數字的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！