大写加下划线转化成小写驼峰形式

 1 //型如XXX_YYY_ZZZ的子串改为xxxYyyZxx的子串
 2     private static String slashToFirstLetterUpper(String input) {
 3         String spliter = "_";
 4         StringBuffer output = new StringBuffer();
 5         String[] words = input.toLowerCase().split(spliter);
 6         for (int i = 0; i < words.length; i++) {
 7             if (i != 0) {
 8                 output.append(fistLetterToUpper(words[i]));
 9             }
10             else {
11                 output.append(words[i]);
12             }
13         }
14 
15         return output.toString();
16     }
17 
18     private static String fistLetterToUpper(String input) {
19         if (input == null)
20             return "";
21         if (input.length() <= 0)
22             return "";
23 
24         return input.substring(0, 1).toUpperCase() + input.substring(1);
25     }