反射将值转换为特定类型

 

1.给定一个实参，以及期望类型

    private <T> T getValueByClass(Object obj, Class<T> cs) {
        String obj2 = String.valueOf(obj);
        Object obj3;
        if (cs.equals(String.class)) {
            obj3 = obj2;
        } else if (cs.equals(int.class) || cs.equals(Integer.class)) {
            obj3 = Integer.valueOf(obj2);
        } else if (cs.equals(long.class) || cs.equals(Long.class)) {
            obj3 = Long.valueOf(obj2);
        } else if (cs.equals(short.class) || cs.equals(Short.class)) {
            obj3 = Short.valueOf(obj2);
        } else if (cs.equals(byte.class) || cs.equals(Byte.class)) {
            obj3 = Byte.valueOf(obj2);
        } else if (cs.equals(float.class) || cs.equals(Float.class)) {
            obj3 = Float.valueOf(obj2);
        } else if (cs.equals(double.class) || cs.equals(Double.class)) {
            obj3 = Double.valueOf(obj2);
        } else if (cs.equals(boolean.class) || cs.equals(Boolean.class)) {
            obj3 = Boolean.valueOf(obj2);
        } else if (cs.equals(Date.class)) {
            obj3 = new Date(Long.parseLong(obj2));
        } else {
            obj3 = (T) obj;
        }
        return (T) obj3;
    }

2.实际调用

    private ClientUserAssist filter(SoMap clientUserMap, Map<String, String> link) {
        ClientUserAssist clientUserAssist = new ClientUserAssist();
        for (Field field : clientUserAssist.getClass().getDeclaredFields()) {
            try {
                Object value = clientUserMap.get(link.get(field.getName()));
                if (value == null) {
                    continue;
                }
                field.setAccessible(true);
                Object valueConvert = getValueByClass(value, field.getType());
                field.set(clientUserAssist, valueConvert);
            } catch (IllegalArgumentException | IllegalAccessException e) {
                throw new RuntimeException("属性取值出错：" + field.getName(), e);
            }
        }
        return clientUserAssist;
    }