map集合和javabean对象之间相互转换方法

素颜马尾好姑娘i 2021-09-17 22:16 392阅读 0赞

亲测可用， 简单易读

`1、使用反射`

/**
     * 使用reflect进行转换,map集合转javabean
     *
     * @param map
     * @param beanClass
     * @return
     * @throws IllegalAccessException
     * @throws InstantiationException
     */
    public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws IllegalAccessException, InstantiationException {
        if (map == null){
            return null;
        }
            
        Object obj = beanClass.newInstance();
     
        Field[] fields = obj.getClass().getDeclaredFields();
        for (Field field : fields) {
            int mod = field.getModifiers();
            if (Modifier.isStatic(mod) || Modifier.isFinal(mod)) {
                continue;
            }
     
            field.setAccessible(true);
            field.set(obj, map.get(field.getName()));
        }
     
        return obj;
    }
     
    /**
     * 使用reflect进行转换,javabean对象转map集合
     *
     * @param obj
     * @return map集合
     * @throws IllegalAccessException java.lang.IllegalAccessException
     * @throws InstantiationException java.lang.InstantiationException
     */
    public static Map<String, Object> objectToMap(Object obj) throws Exception {
        if (obj == null) {
            return null;
        }
     
        Map<String, Object> map = new HashMap<String, Object>();
     
        Field[] declaredFields = obj.getClass().getDeclaredFields();
        for (Field field : declaredFields) {
            field.setAccessible(true);
            map.put(field.getName(), field.get(obj));
        }
     
        return map;
    }

2、使用Introspector（推荐）

/**
     * 使用Introspector，map集合成javabean
     *
     * @param map       map
     * @param beanClass bean的Class类
     * @return bean对象
     */
    public static <T> T mapToBean(Map<String, Object> map, Class<T> beanClass) {
     
        if (MapUtils.isEmpty(map)) {
            return null;
        }
     
        try {
            T t = beanClass.newInstance();
     
            BeanInfo beanInfo = Introspector.getBeanInfo(t.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            for (PropertyDescriptor property : propertyDescriptors) {
                Method setter = property.getWriteMethod();
                if (setter != null) {
                    setter.invoke(t, map.get(property.getName()));
                }
            }
            return t;
        } catch (Exception ex) {
            log.error("########map集合转javabean出错######，错误信息，{}", ex.getMessage());
            throw new RuntimeException();
        }
     
    }
     
    /**
     * 使用Introspector，对象转换为map集合
     *
     * @param beanObj javabean对象
     * @return map集合
     */
    public static Map<String, Object> beanToMap(Object beanObj) {
     
        if (null == beanObj) {
            return null;
        }
     
        Map<String, Object> map = new HashMap<>();
     
        try {
            BeanInfo beanInfo = Introspector.getBeanInfo(beanObj.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            for (PropertyDescriptor property : propertyDescriptors) {
                String key = property.getName();
                if (key.compareToIgnoreCase("class") == 0) {
                    continue;
                }
                Method getter = property.getReadMethod();
                Object value = getter != null ? getter.invoke(beanObj) : null;
                map.put(key, value);
            }
     
            return map;
        } catch (Exception ex) {
            log.error("########javabean集合转map出错######，错误信息，{}", ex.getMessage());
            throw new RuntimeException();
        }
    }

原贴地址：[https://blog.csdn.net/hanxue6898/article/details/81187104][https_blog.csdn.net_hanxue6898_article_details_81187104]

[https_blog.csdn.net_hanxue6898_article_details_81187104]: https://blog.csdn.net/hanxue6898/article/details/81187104