MessageFormat

深碍√TFBOYSˉ_ 2022-01-12 07:23 160阅读 0赞

转自：[https://blog.csdn.net/woshixuye/article/details/8252391][https_blog.csdn.net_woshixuye_article_details_8252391]

一、基本概念

MessageFormat用来格式化一个消息，通常是一个字符串。MessageFormat模式的主要部分：

FormatElement:  
\{ ArgumentIndex \}  
\{ ArgumentIndex , FormatType \}  
\{ ArgumentIndex , FormatType , FormatStyle \}

FormatType:  
number  
date  
time  
choice(需要使用ChoiceFormat)

FormatStyle:  
short  
medium  
long  
full  
integer  
currency  
percent  
SubformatPattern(子模式)

\{0\}、\{1,number,short\}、\{2,number,\#.\#\}属于FormatElement，0,1,2是ArgumentIndex

\{1,number,short\}里面的number属于FormatType，short则属于FormatStyle

\{1,number,\#.\#\}里面的\#.\#就属于子格式模式

二、例子

1.  import java.text.MessageFormat;
2.  
3.  String str = "\{0\}\{1\}\{2\}\{3\}\{4\}\{5\}\{6\}\{7\}\{8\}\{9\}\{10\}\{11\}\{12\}\{13\}\{14\}\{15\}\{16\}";
4.  Object\[\] array = new Object\[\]\{ "A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q"\};
5.  String value = MessageFormat.format(str, array);
6.  System.out.println(value); // ABCDEFGHIJKLMNOPQ
7.  
8.  
9.  String message = "oh, \{0\} is a person";
10. Object\[\] array = new Object\[\]\{ "ZhangSan"\};
11. String value = MessageFormat.format(message, array);
12. System.out.println(value); // oh, ZhangSan is a person
13. 
14. 
15. String message = "oh, \{0,number,\#.\#\} is a number";
16. Object\[\] array = new Object\[\]\{ new Double(3.1415)\};
17. String value = MessageFormat.format(message, array);
18. System.out.println(value); // oh, 3.1 is a number
19. 
20. 
21. // MessageFormat的format方法源码
22. public static String format(String pattern, Object ... arguments) 
23. \{
24. MessageFormat temp = new MessageFormat(pattern);
25. return temp.format(arguments);
26. \}

对字符串的匹配比较智能

1.  String str = "\{0\} | \{1\} | \{0\} | \{1\}";
2.  Object\[\] array = new Object\[\] \{ "A", "B" \};
3.  String value = MessageFormat.format(str, array);
4.  System.out.println(value); // A | B | A | B

原帖地址(节选):[http://zqc-0101.iteye.com/blog/1140140][http_zqc-0101.iteye.com_blog_1140140]

转载于:https://www.cnblogs.com/sharpest/p/10884761.html

[https_blog.csdn.net_woshixuye_article_details_8252391]: https://blog.csdn.net/woshixuye/article/details/8252391
[http_zqc-0101.iteye.com_blog_1140140]: http://zqc-0101.iteye.com/blog/1140140