spring中beanName的命名規則

問題如下：今天工作中有一個類的命名爲XPersonService，我獲取bean的時候代碼如下

AnnotationConfigApplicationContext config = new AnnotationConfigApplicationContext(AppConfig.class);

XpersonService xPersonService = (XpersonService) config.getBean("xPersonService");

但是報錯了：
Exception in thread “main” org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named ‘xPersonService’ available
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:681)
at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1218)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1109)
at Main.main(Main.java:10)

所以這樣是獲取不到的，我就追蹤到源碼裏面看了一下，發現了點東西

    /**
     * Utility method to take a string and convert it to normal Java variable
     * name capitalization.  This normally means converting the first
     * character from upper case to lower case, but in the (unusual) special
     * case when there is more than one character and both the first and
     * second characters are upper case, we leave it alone.
     * <p>
     * Thus "FooBah" becomes "fooBah" and "X" becomes "x", but "URL" stays
     * as "URL".
     *
     * @param  name The string to be decapitalized.
     * @return  The decapitalized version of the string.
     */
    public static String decapitalize(String name) {
        if (name == null || name.length() == 0) {
            return name;
        }
        if (name.length() > 1 && Character.isUpperCase(name.charAt(1)) &&
                        Character.isUpperCase(name.charAt(0))){
            return name;
        }
        char chars[] = name.toCharArray();
        chars[0] = Character.toLowerCase(chars[0]);
        return new String(chars);
    }

所以總結beanName的生成規則如下：
1.當類的首字母和第二個字母都是大寫時，返回類的原值，及我這裏應該寫成config.getBean(“XPersonService”)。
2.默認的情況下是將類的首字母小寫,其餘的字母不變。