在Freemarker中，如何为1行使用自定义NumberFormat或DateFormat（但不是报告的其余部分）？

Question

I have 2 numbers I want to display in a freemarker file:

• Benchmark long id

• Benchmark long timeSpend

The id should use the default NumberFormat instance, but the timeSpend should use my MillisecondsSpendNumberFormat instance, so I get something like this in the output:

• id: 1 234 567

• timeSpend: 1min 23sec 456ms

How do I use my NumberFormat instance for 1 long instance, but not for all of them?

Answer 1

You could give your formatter instance to the Freemarker template (add it to the model that contains the objects being passed to the template) and then explicitly call its format() method to format the number.

Something like

timeSpend: ${myCustomFormatter.format(timeSpend)}

Answer 2

You can use ${someNumber?string("somePattern")} to use non-default format for a single occasion. But your real problem will be that FreeMarker always uses DecimalFormat for number formatting, and you can only specify the pattern. So you can't use MillisecondsSpendNumberFormat at all, unless you invoke it manually. You can either do that by putting a MillisecondsSpendNumberFormat instance into the data-model and call it's Java API from the template, or by implementing a TemplateMethodModelEx that does the formatting internally, then pull it into some commonly #include -d/ #import -d file with <#assign formatTimeSpent = "com.example.MyTimeSpentFormatter"?new()> and then use ${formatTimeSpent(someNumber)} in the templates.