将字段名称转换为驼峰命名

代码演示

    @Test
    public void test_str(){
        StringBuilder sb = new StringBuilder();
        String field = "this_is_an_apple";
        if (!field.contains("_")){

        }
        String[] s = field.split("_");
        sb.append(s[0]);
        for (int i = 1; i < s.length; i++) {
            String prefix = s[i].substring(0, 1);
            String join = StringUtils.join(prefix.toUpperCase(), s[i].substring(1));
            sb.append(join);
            System.out.println(join);
        }
        System.out.println(sb.toString());
    }

运行结果

Is
An
Apple
thisIsAnApple