## BeanConvert 可以為POJO定義一個注解，在sql準備參數前，調用此API，得到一個新Bean，用于參數設定。BeanConvert定義如下 ```java @Plugin public interface BeanConvert { /** * 返回入庫之前的對象 * @param ctx * @param obj * @param an 注解信息，可以提供額外參數 * @return */ default Object before(ExecuteContext ctx, Object obj, Annotation an){ return obj; } /** * 返回查詢結果后的對象 * @param ctx * @param obj * @param an * @return */ default Object after(ExecuteContext ctx, Object obj, Annotation an){ return obj; } } ``` 比如以AttributeConvert的例子作為說明，可以定義如下BeanEncrypt, 其執行類BeanStringConvert， 注解有個attr方法，標識需要加密的字段 ```java @Retention(RetentionPolicy.RUNTIME) @Target(value = {ElementType.TYPE}) @Builder(BeanStringConvert.class) public @interface BeanEncrypt { String attr(); } ``` BeanStringConvert的實現如下(僅僅簡單修改了需要加密的字段，添加一個時間戳) ```java public class BeanStringConvert implements BeanConvert{ public Object before(ExecuteContext ctx, Object obj, Annotation an){ BeanEncrypt beanEncrypt = (BeanEncrypt)an; String attrName = beanEncrypt.attr(); String attrValue = (String)BeanKit.getBeanProperty(obj,attrName); String encryptAttrValue = attrValue+"-"+System.currentTimeMillis(); BeanKit.setBeanProperty(obj,encryptAttrValue,attrName); return obj; } public Object after(ExecuteContext ctx, Object obj, Annotation an){ BeanEncrypt beanEncrypt = (BeanEncrypt)an; String attrName = beanEncrypt.attr(); String encryptAttrValue = (String)BeanKit.getBeanProperty(obj,attrName); String attrValue = encryptAttrValue.split("-")[0]; BeanKit.setBeanProperty(obj,attrValue,attrName); return obj; } } ``` ```java @Table(name="sys_user") @Data @BeanEncrypt( attr="name") public static class UserEntity2{ @Auto Long id ; String name; } ```