如何在 Struts 1.2 中的 .properties 文件中转义大括号

Question

I have a requirement to retain the curly brackets from properties file in my rendered JSP code. Is it possible?

I have tried options like: \\{ , '{ , {{ , '{' , /{ , but no help.

At runtime, I get an exception:

java.lang.IllegalArgumentException: can't parse argument number

The problem is that struts processes the {} as a placeholder for a runtime value. Any help greatly appreciated.

Answer 1

see here http://struts.apache.org/2.x/docs/how-to-escape-special-chars-in-resource-bundles.html

use '{' and '}' to escape.

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Just re-read your question looks like it didn't help.

Answer 2

I jumped to this problem just 10 minutes ago. This is my try: put '&#123' instead of '{'. (Reference: http://www.asciitable.com/ )

Don't use Oct or Hex code since Java will parse these numbers into { before actually reading the key; therefore, it will lead to the same problem. Only HTML code will work, since Java will not parse it, but the JSP page will

Answer 3

From the MessageFormat spec: http://download.oracle.com/javase/1.4.2/docs/api/java/text/MessageFormat.html

Within a String, "''" represents a single quote. A QuotedString can contain arbitrary characters except single quotes; the surrounding single quotes are removed. An UnquotedString can contain arbitrary characters except single quotes and left curly brackets. Thus, a string that should result in the formatted message "'{0}'" can be written as "'''{'0}''" or "'''{0}'''".

which means you should probably try to quite your curly braces like this '''{' .

Answer 4

Since single quote ' is always doubled by struts before it arrives into MessageFormat , you can not produce '''{' as suggested by @Mihai Toader . Or any other odd-numbered count of them required by MessageFormat

I have ended up using parameters with value { and }

my.property = You have ${0}count{1} unread messages

If you supply parameter values { and } , you get this

You have ${count} unread messages