map集合和javabean对象之间相互转换方法

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();
    }
}