在 Java 中使用 MessageFormat.Format()格式化消息

我已经在一个资源包中存储了一些消息。

import java.text.MessageFormat;


String text = MessageFormat.format("You're about to delete {0} rows.", 5);
System.out.println(text);

假设第一个参数，即实际的消息存储在一个属性文件中，并以某种方式检索该属性文件。

第二个参数(即5)是一个动态值，应该放置在占位符 {0}中，这是不会发生的。下一行是,

即将删除{0}行。

占位符不会被实际参数替换。

这里是撇号 -You're。我试图像平常一样逃避 You\\'re，虽然它没有工作。需要做出哪些改变才能使其发挥作用？

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最佳答案

Add an extra apostrophe ' to the MessageFormat pattern String to ensure the ' character is displayed

String text =
java.text.MessageFormat.format("You''re about to delete {0} rows.", 5);
^

An apostrophe (aka single quote) in a MessageFormat pattern starts a quoted string and is not interpreted on its own. From the javadoc

A single quote itself must be represented by doubled single quotes '' throughout a String.

The String You\\'re is equivalent to adding a backslash character to the String so the only difference will be that You\re will be produced rather than Youre. (before double quote solution '' applied)

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You need to use double apostrophe instead of single in the "You''re", eg:

String text = java.text.MessageFormat.format("You''re about to delete {0} rows.", 5);
System.out.println(text);
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Just be sure you have used double apostrophe ('')

String text = java.text.MessageFormat.format("You''re about to delete {0} rows.", 5);
System.out.println(text);

Edit:

Within a String, a pair of single quotes can be used to quote any arbitrary characters except single quotes. For example, pattern string "'{0}'" represents string "{0}", not a FormatElement. ...

Any unmatched quote is treated as closed at the end of the given pattern. For example, pattern string "'{0}" is treated as pattern "'{0}'".

Source http://docs.oracle.com/javase/7/docs/api/java/text/MessageFormat.html

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For everyone that has Android problems in the string.xml, use \'\' instead of single quote.

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Using an apostrophe ’ (Unicode: \u2019) instead of a single quote ' fixed the issue without doubling the \'.

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Here is a method that does not require editing the code and works regardless of the number of characters.

String text =
java.text.MessageFormat.format(
"You're about to delete {0} rows.".replaceAll("'", "''"), 5);

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