java 使用 Dozer 映射对象列表
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Mapping Lists of objects with Dozer
提问by user1323246
I created a dozer mapping for ClassA to ClassB.
我为 ClassA 到 ClassB 创建了一个推土机映射。
Now I want to map a List<ClassA>to a List<ClassB>.
现在我想将 a 映射List<ClassA>到 a List<ClassB>。
Is it possible to just
是否有可能只是
mapper.map(variableListClassA, variableListClassB)
or do I have to go over a loop, e.g.
还是我必须遍历一个循环，例如
for (ClassA classA : variableListClassA) {
variableListClassB.add(mapper.map(classA, ClassB.class))
}
采纳答案by artbristol
You need to use the loop, because the type of the list is erased at runtime.
您需要使用循环，因为列表的类型在运行时被擦除。
If both lists are a field of a class, you can map the owning classes.
如果两个列表都是类的字段，则可以映射所属类。
回答by MatthiasLaug
you could also use A helper class to do that in one step
您也可以使用 A helper 类一步完成此操作
public class DozerHelper {
public static <T, U> ArrayList<U> map(final Mapper mapper, final List<T> source, final Class<U> destType) {
final ArrayList<U> dest = new ArrayList<U>();
for (T element : source) {
if (element == null) {
continue;
}
dest.add(mapper.map(element, destType));
}
// finally remove all null values if any
List s1 = new ArrayList();
s1.add(null);
dest.removeAll(s1);
return dest;
}
}
and your call above would be like
你上面的电话就像
List<ClassB> listB = DozerHelper.map(mapper, variableListClassA, ClassB.class);
