在项目中使用pojo和vo(返回给前端或第三方接口的视图)，会经常遇到pojo转vo的问题。之前总是以set方式去装配，但是遇到多个参数去set就会很麻烦。然后本人结合网上资料，使用CommonBeanUtils.copyProperties去对单个pojo转vo实现简化。
ps.pojo字段与vo字段形式、类型保持一致
我这个人真的是特别懒的人，能少些代码尽量少写代码；
包括下面查出来的pojo集合不做业务处理，直接转化成vo集合返回，本人也懒得写。。。。
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| List<RespSelectedActivitiesVo> voList = new ArrayList<>();
promotionAreaList.forEach(promotionArea -> {
RespSelectedActivitiesVo vo = new RespSelectedActivitiesVo();
CommonBeanUtils.copyProperties(promotionArea, vo);
voList.add(vo);
});
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所以我又写了一个集合转化为vo的方法CommonBeanUtils.copyListProperties。
所以以上代码简化为一行搞定。
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| return CommonBeanUtils.copyListProperties(promotionAreaList, RespSelectedActivitiesVo.class);
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源代码分割线——————————————————————————————————————————
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| import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import javax.xml.datatype.XMLGregorianCalendar;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
@Slf4j
public abstract class CommonBeanUtils extends org.springframework.beans.BeanUtils {
public static void copyProperties(Object source, Object target) throws BeansException {
Assert.notNull(source, "Source must not be null");
Assert.notNull(target, "Target must not be null");
Class<?> actualEditable = target.getClass();
PropertyDescriptor[] targetPds = getPropertyDescriptors(actualEditable);
for (PropertyDescriptor targetPd : targetPds) {
if (targetPd.getWriteMethod() != null) {
PropertyDescriptor sourcePd = getPropertyDescriptor(source.getClass(), targetPd.getName());
if (sourcePd != null && sourcePd.getReadMethod() != null) {
try {
Method readMethod = sourcePd.getReadMethod();
if (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {
readMethod.setAccessible(true);
}
Object value = readMethod.invoke(source);
if (value != null) {
Method writeMethod = targetPd.getWriteMethod();
Type targetParameterType = writeMethod.getGenericParameterTypes()[0];
if (!(targetParameterType.equals(XMLGregorianCalendar.class))) {
if (!Modifier.isPublic(writeMethod.getDeclaringClass().getModifiers())) {
writeMethod.setAccessible(true);
}
writeMethod.invoke(target, value);
}
}
} catch (Throwable ex) {
log.error(ex.getMessage());
throw new FatalBeanException("Could not copy properties from source to target", ex);
}
}
}
}
}
public static <T> List<T> copyListProperties(List<? extends Object> sources, final Class<T> voClass) {
Assert.isTrue(!CollectionUtils.isEmpty(sources), "Source must not be null");
List<T> targets = new ArrayList<>();
sources.forEach(source -> {
try {
T target = voClass.newInstance();
copyProperties(source, target);
targets.add(target);
} catch (InstantiationException | IllegalAccessException e) {
log.error(e.getMessage());
}
});
return targets;
}
}
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