字符串擴展實用程序

Question

我似乎想起了Apache Commons或類似的API，它允許您使用類似於Freemarker或Velocity（或者JSP容器）的屬性擴展來替換內聯字符串，而無需拖入這些工具。任何人都可以回憶這個API是什麼？顯然，名是不正確的，但結構看起來是這樣的：

Person person = ...; 
String expanded = SomeAPI.expand(
        "Hi ${name}, you are ${age} years old today!", 
        person); 

我不是在尋找關於如何做到這一點的其他建議（例如使用格式化），只是現有的API。

Answer 1

這應該使用Apache下議院Lang和BeanUtils做的伎倆：

StrSubstitutor sub = new StrSubstitutor(new BeanMap(person)); 

    String replaced = sub.replace("Hi ${name}, you are ${age} years old today!"); 

Answer 2

MessageFormat可能是你在找什麼：

final MessageFormat format = new MessageFormat("Hi {0}, you are {1, number, #} years old today!"); 
final String expanded = format.format(new Object[]{person.getName(), person.getAge()}); 

還有像String.format一個C：

final String expanded = String.format("Hi %1s, you are %2s years old today!", person.getName(), person.getAge()); 

測試：

public static void main(String[] args) { 
    final MessageFormat format = new MessageFormat("Hi {0}, you are {1,number,#} years old today!"); 
    System.out.println(format.format(new Object[]{"Name", 15})); 
    System.out.println(String.format("Hi %1s, you are %2s years old today!", "Name", 15)); 
} 

輸出：

Hi Name, you are 15 years old today! 
Hi Name, you are 15 years old today!