使用Struts2标签来格式化数字 [英] Using Struts2 Tags to Formatting Numbers

问题描述

我想在我们的jsp页面中格式化一些数字。

首先我定义一些资源在我的porperties中
format.number.with2Decimal = {0 ，数字，＃0.00}

......

问题1：

i想知道'＃'和'0'是什么意思？

0.00，＃0.00，##。00，### 0.00

谁能告诉我之间的区别他们？谢谢！


$ b $问题2：

如果我在我的动作中定义了一个BigDecimal类型
BigDecimal number1;

然后我的页面应该使用一个格式来显示这个值，

1.if number1 = null然后显示-NIL -

2.if number1 = 0然后显示-NIL -

3.if number1> 0然后显示1.00,3434.98 .....

请忽略号码<0

问题3：
将number1更改为String，

1.if number1 = null或为空或空白，然后显示-NIL -

2.if number1 =你好然后显示你好....

你能给我的帮助？

解决方案

Question1：我想知道什么是＃'和' 0 '是指？
0.00 ，＃0.00 ， ##。00 ， ### 0.00 谁能告诉我他们之间的区别？

• 0 表示一个数字必须打印，不管是否存在


• ＃ li>
  

示例：

  System.out .println（假设美国语言环境：+ 
'，'千分隔符，+ 
'。'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（==============================）; 
  

b blockquote>

 假设US Locale：'，'为千位分隔符，'。'为小数点分隔符）
 
 ====== ======================== 
格式（＃，## 0.0 ##）
 ------- ----------------------- 
 1234.0 = 1,234.0 
 123.4 = 123.4 
 12.34 = 12.34 
 1.234 = 1.234 
 ============================== 
 
 ======= ======================= 
格式（＃，000.000）
 ------------ ------------------ 
 1234.0 = 1,234.000 
 123.4 = 123.400 
 12.34 = 012.340 
 1.234 = 001.234 
 ============================== 
  

在Struts2中，您可以将这种格式与 getText（）函数一起应用于 ActionSupport 。

PS：问题2和3是微不足道的。

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?

解决方案

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!

• 0 means 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("\n==============================");
    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("\n==============================");
    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).

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