spring 中 PO与DTO相互转换的工具类

 public class BeanMapper {

     /**
      * 持有Dozer单例, 避免重复创建DozerMapper消耗资源.
      */
     private static DozerBeanMapper dozer = new DozerBeanMapper();

     /**
      * 基于Dozer转换对象的类型.
      */
     public static <T> T map(Object source, Class<T> destinationClass) {
         return dozer.map(source, destinationClass);
     }

     /**
      * 基于Dozer转换Collection中对象的类型.
      */
     public static <T> List<T> mapList(Collection sourceList, Class<T> destinationClass) {
         List<T> destinationList = Lists.newArrayList();
         for (Object sourceObject : sourceList) {
             T destinationObject = dozer.map(sourceObject, destinationClass);
             destinationList.add(destinationObject);
         }
         return destinationList;
     }

     /**
      * 基于Dozer将对象A的值拷贝到对象B中.
      */
     public static void copy(Object source, Object destinationObject) {
         dozer.map(source, destinationObject);
     }
 }

//清晰版
import java.util.Collection;
import java.util.List;
import org.dozer.DozerBeanMapper;
import com.google.common.collect.Lists;

public class BeanMapper {

    private static DozerBeanMapper dozer = new DozerBeanMapper();

    public static <T> T map(Object source, Class<T> destinationClass) {
        return dozer.map(source, destinationClass);
    }

    public static <T> List<T> mapList(Collection sourceList, Class<T> destinationClass) {
        List<T> destinationList = Lists.newArrayList();
        for (Object sourceObject : sourceList) {
            T destinationObject = dozer.map(sourceObject, destinationClass);
            destinationList.add(destinationObject);
        }
        return destinationList;
    }

    public static void copy(Object source, Object destinationObject) {
        dozer.map(source, destinationObject);
    }
}