如何在 Java 8 和 ModelMapper 中使用显式映射？
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How to use Explicit Map with Java 8 and ModelMapper?
提问by hudrogen
I learn how to use ModelMapper by official documentation http://modelmapper.org/getting-started/
我通过官方文档http://modelmapper.org/getting-started/学习如何使用 ModelMapper
There is code sample for explicit mapping using java 8
有使用 java 8 进行显式映射的代码示例
modelMapper.addMappings(mapper -> {
mapper.map(src -> src.getBillingAddress().getStreet(),
Destination::setBillingStreet);
mapper.map(src -> src.getBillingAddress().getCity(),
Destination::setBillingCity);
});
How to use this code correctly? When I type this code snippet in IDE, IDE show me message cannot resolve method map
如何正确使用此代码？当我在 IDE 中键入此代码片段时，IDE 会向我显示消息cannot resolve method map
回答by Bentaye
They missed a step in this example, the addMappingsmethod they use is the addMappingsfrom TypeMap, not from ModelMapper. You need to define a TypeMapfor your 2 objects. This way:
他们在这个例子中遗漏了一个步骤，addMappings他们使用的方法是addMappingsfrom TypeMap，而不是 from ModelMapper。您需要TypeMap为 2 个对象定义一个。这条路：
// Create your mapper
ModelMapper modelMapper = new ModelMapper();
// Create a TypeMap for your mapping
TypeMap<Order, OrderDTO> typeMap =
modelMapper.createTypeMap(Order.class, OrderDTO.class);
// Define the mappings on the type map
typeMap.addMappings(mapper -> {
mapper.map(src -> src.getBillingAddress().getStreet(),
OrderDTO::setBillingStreet);
mapper.map(src -> src.getBillingAddress().getCity(),
OrderDTO::setBillingCity);
});
An other way would be to use the addMappingsmethod from ModelMapper. It does not use lambdas and takes a PropertyMap. It is short enough too:
另一种方法是使用addMappings方法 from ModelMapper。它不使用 lambdas 并采用PropertyMap。它也足够短：
ModelMapper modelMapper = new ModelMapper();
modelMapper.addMappings(new PropertyMap<Order, OrderDTO>() {
@Override
protected void configure() {
map().setBillingStreet(source.getBillingAddress().getStreet());
map().setBillingCity(source.getBillingAddress().getCity());
}
});
