使用google guava类库进行属性名称的驼峰、下划线以及连接符格式互转

public class AnswerApp {

	public static void main(String[] args) {
        // 驼峰转下划线, userName -> user_name
        Converter<String, String> converter = CaseFormat.LOWER_CAMEL.converterTo(CaseFormat.LOWER_UNDERSCORE);
		// 输出: user_name
        System.out.println(converter.convert("userName"));
        System.out.println();

        // 驼峰转连接符, userName -> user-name
        converter = CaseFormat.LOWER_CAMEL.converterTo(CaseFormat.LOWER_HYPHEN);
        // 输出: user-name
        System.out.println(converter.convert("userName"));
        System.out.println();

        // 驼峰转首字符大写驼峰, userName -> UserName
        converter = CaseFormat.LOWER_CAMEL.converterTo(CaseFormat.UPPER_CAMEL);
        // 输出: UserName
        System.out.println(converter.convert("userName"));
        System.out.println();

        // 驼峰转大写下划线, userName -> USER_NAME
        converter = CaseFormat.LOWER_CAMEL.converterTo(CaseFormat.UPPER_UNDERSCORE);
        // 输出: USER_NAME
        System.out.println(converter.convert("userName"));
        System.out.println();
    }
    
}