平台工具[3]计算机基础编程语言Java

实体Bean与Map之间的转换

  1. 反射方式

  2. Introspector 方式

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public static Object convertMap(Class type, Map map)
        throws IntrospectionException, IllegalAccessException,
        InstantiationException, InvocationTargetException {
    BeanInfo beanInfo = Introspector.getBeanInfo(type); // 获取类属性
    Object obj = type.newInstance(); // 创建 JavaBean 对象

    // 给 JavaBean 对象的属性赋值
    PropertyDescriptor[] propertyDescriptors =  beanInfo.getPropertyDescriptors();
    for (int i = 0; i< propertyDescriptors.length; i++) {
        PropertyDescriptor descriptor = propertyDescriptors[i];
        String propertyName = descriptor.getName();

        if (map.containsKey(propertyName)) {
            // 下面一句可以 try 起来，这样当一个属性赋值失败的时候就不会影响其他属性赋值。
            Object value = map.get(propertyName);

            Object[] args = new Object[1];
            args[0] = value;

            descriptor.getWriteMethod().invoke(obj, args);
        }
    }
    return obj;
}
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// 反射方式
/**
 * Java Map反射成POJO(ResourcesBean )
 */
private static ResourcesBean mapToObject(Map<String, Object> map,
		String ObjectBeanPath) {
	ResourcesBean resourcesBean = new ResourcesBean();
	try {
		Class clazz = Class.forName(ObjectBeanPath);
		for (Map.Entry<String, Object> entry : map.entrySet()) {
			Field filed = clazz.getDeclaredField(entry.getKey());
			filed.setAccessible(true);
			filed.set(resourcesBean, entry.getValue() != null ? String
					.valueOf(entry.getValue()) : "");
		}
	} catch (Exception e) {
		log.error(e);
	}
	return resourcesBean;
}

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