通过JPA注解获取某个类主键字段

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public String getPkColumn(String className) {     String pkColumn = null;     try {         Class clazz = Class.forName(className);         Field[] fields = clazz.getDeclaredFields();         for (Field field : fields) {             if(field.getAnnotation(Id.class) != null){                 Annotation annotation = field.getAnnotation(Column.class);                 pkColumn = ((Column)annotation).name();                 break;             }         }     } catch (ClassNotFoundException e) {         e.printStackTrace();     } finally {         return pkColumn;     } }