Java用名称替换花括号中的单词

Question

我有一个字符串：

String message = "This is a message for {ID_PW}. Your result is {exam_result}. Please quote {ID_PW} if replying";

我正在从CSV导入数据，我想用这些数据替换花括号之间的项。

java prettyprint-override">// Using OpenCSV to read in CSV...code omitted for brevity
values = (Map<String, String>) reader.readMap();
// values has 'ID_PW', 'exam_result', etc keys

如何将消息中花括号中的项替换为值中键的等效值？

Answer 1

您可能正在寻找：

String s = "I bought {0,number,integer} mangos. From {1}, the fruit seller. Out of them {2,number,percent} were bad.";
MessageFormat formatter = new MessageFormat(s);
Object[] argz = {22, "John", 0.3};
System.out.println(formatter.format(argz));

这输出：

I bought 22 mangos. From John, the fruit seller. Out of them 30% were bad.

有关更多详细信息，请参阅https://docs.oracle.com/javase/8/docs/api/java/text/messageformat.html。

Answer 2

试试看：

for (Map.Entry<String, String> entry : values.entrySet())
{
    message = message.replaceAll("\\{" + Pattern.quote(entry.getKey()) + "\\}", entry.getValue());
}

String.ReplaceAll（String,String）的第一个参数是一个正则表达式，因此values映射的键应该被引用（通过pattern.quote（String））以防止它们被解释为正则表达式。