在Java开发中,会遇到从前台传过来的参数是一个类,这个类与数据库的实体类有些属性是一致的,有些是不一致的,为了避免相同属性赋值的麻烦,我们最好能有一个通用的复制方法。
下面这个类便可以帮我们实现(main方法是我用来测试用的,大家使用的时候把它去掉即可)。在Main方法中我给AppointmentOrderParam类初始化并赋值,然后想把这个类的值能够自动赋值给另一个类AppointmentOrder,这两个类大部分属性是一样的,有个别不一样。赋值有个需要注意的地方,那就是在AppointmentOrderParam类中的apointmentTime字段类型是String,而AppointmentOrder类中的同名字段apointmentTime是个Date类型,像这样的情况就不要让它赋值了,跳过即可。判断的根据是根据属性名称和属性类型来判断。如果是String,sourceProperty[i].getPropertyType()得到的返回值是"java.lang.String"类,如果是Date,sourceProperty[j].getPropertyType()得到的返回值是"java.util.Date"类,这两个类型是不一样的。这样就没有问题了。
package com.utils; import com.entity.AppointmentOrder; import com.param.AppointmentOrderParam; import java.beans.BeanInfo; import java.beans.Introspector; import java.beans.PropertyDescriptor; /** * Created by wangzhipeng on 2017/3/16. */ public class CopyUtils { public static void Copy(Object source, Object dest) throws Exception { // 获取属性 BeanInfo sourceBean = Introspector.getBeanInfo(source.getClass(),Object.class); PropertyDescriptor[] sourceProperty = sourceBean.getPropertyDescriptors(); BeanInfo destBean = Introspector.getBeanInfo(dest.getClass(),Object.class); PropertyDescriptor[] destProperty = destBean.getPropertyDescriptors(); try { for (int i = 0; i < sourceProperty.length; i++) { for (int j = 0; j < destProperty.length; j++) { if (sourceProperty[i].getName().equals(destProperty[j].getName()) && sourceProperty[i].getPropertyType() == destProperty[j].getPropertyType()) { // 调用source的getter方法和dest的setter方法 destProperty[j].getWriteMethod().invoke(dest,sourceProperty[i].getReadMethod().invoke(source)); break; } } } } catch (Exception e) { throw new Exception("属性复制失败:" + e.getMessage()); } } public static void main(String[] args) throws Exception{ AppointmentOrderParam appointmentOrderParam = new AppointmentOrderParam(); appointmentOrderParam.setAppointmentTime("2017/05/04"); appointmentOrderParam.setConditionDescription("这个毛病已经由来已久了,以前没钱看,现在有钱了,想彻底根治"); appointmentOrderParam.setExpertId("myh111000"); appointmentOrderParam.setOtherOrderId("0001123ll33"); appointmentOrderParam.setSubscriberName("呼兰芬"); appointmentOrderParam.setSubscriberPhone("11097777"); appointmentOrderParam.setTheDisease("呼吸病"); appointmentOrderParam.setTimeSlot(1); appointmentOrderParam.setTreatmentAddress("北京第三附属医院"); appointmentOrderParam.setTreatmentPrice(200); appointmentOrderParam.setUserId("kkk888"); AppointmentOrder appointmentOrder = new AppointmentOrder(); CopyUtils.Copy(appointmentOrderParam,appointmentOrder); System.out.println(appointmentOrder); } }