自定义注解@TableTreeParentId、@TableTr

先自定义两个注解：@TableTreeParentId、@TableTreePath

@TableTreeParentId.png @TableTreePath.png

实体类中使用

image.png

比如新增一个机构：/api/org/insert
service里重写insert 方法

    @Override
    public boolean insert(T entity) {
        try {
            setPath(entity);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
        return super.insert(entity);
    }

setPath方法

    protected void setPath(T model) throws IllegalAccessException {
        Map<Class, Field> annoFieldMap = getAnnoNameAndValue(model.getClass());
        Field tableTreePathField = annoFieldMap.get(TableTreePath.class);
        Field tableTreeParentIdField = annoFieldMap.get(TableTreeParentId.class);

        tableTreePathField.setAccessible(true);
        tableTreeParentIdField.setAccessible(true);



        Serializable parentId = ((Serializable) tableTreeParentIdField.get(model));

        if(parentId != null) {

            //最顶层 则PATH设置为/
            if (parentId.toString().equals("0") || StringUtils.isEmpty(parentId.toString())) {
                tableTreePathField.set(model, "/");
            } else {
                T parent = this.selectById(parentId);
                String parentPath = tableTreePathField.get(parent).toString();
                String modelPath = parentPath + parentId.toString() + "/";
                tableTreePathField.set(model, modelPath);
            }
        }
    }

getAnnoNameAndValue方法
利用反射机制得到该类的所有属性（private、default、protected、public），java.lang.Class.getAnnotations()方法返回当前这个元素上的所有注释。如果这个元素没有注释，它返回一个长度为零的数组。

    protected Map<Class, Field> getAnnoNameAndValue(Class clazz) {
        Map<Class, Field> result = new HashMap<>();
        for (Field field : clazz.getDeclaredFields()) {
            Annotation[] annotations = field.getAnnotations();
            for (Annotation annotation : annotations) {
                Class<? extends Annotation> annoClass = annotation.annotationType();
                result.put(annoClass, field);
            }
        }
        return result;
    }