java將對象轉map,map轉對象工具類

 /**
     * 將map轉換為一個對象
     *
     * @param map
     * @param beanClass
     * @return
     * @throws Exception
     */
    public static Object mapToObject(Map<String, String> map, Class<?> beanClass) throws Exception {
        if (map == null)
            return null;

        Object obj = beanClass.newInstance();

        BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        for (PropertyDescriptor property : propertyDescriptors) {
            Method setter = property.getWriteMethod();
            if (setter != null) {
                setter.invoke(obj, map.get(property.getName()));
            }
        }

        return obj;
    }

    /**
     * 將對象轉換為map
     *
     * @param obj
     * @return
     * @throws Exception
     */
    public static Map<String, String> obj2Map(Object obj) {

        Map<String, String> map = new HashMap<String, String>();
        // System.out.println(obj.getClass());
        // 獲取f對象對應類中的所有屬性域
        Field[] fields = obj.getClass().getDeclaredFields();
        for (int i = 0, len = fields.length; i < len; i++) {
            String varName = fields[i].getName();
            varName = varName.toLowerCase();//將key置為小寫，默認為對象的屬性
            try {
                // 獲取原來的訪問控制權限
                boolean accessFlag = fields[i].isAccessible();
                // 修改訪問控制權限
                fields[i].setAccessible(true);
                // 獲取在對象f中屬性fields[i]對應的對象中的變量
                Object o = fields[i].get(obj);
                if (o != null)
                    map.put(varName, o.toString());
                // System.out.println("傳入的對象中包含一個如下的變量：" + varName + " = " + o);
                // 恢復訪問控制權限
                fields[i].setAccessible(accessFlag);
            } catch (IllegalArgumentException ex) {
                ex.printStackTrace();
            } catch (IllegalAccessException ex) {
                ex.printStackTrace();
            }
        }
        return map;
    }