我有一堆实现类型为 Repository< T的仓库bean？扩展Node> 。现在我可以从用户那里获得随机节点的列表，并且我想为每个节点获取适当的存储库。由于 Spring 4.0RC1 ，我们可以自动导入像这样的存储库：
@Autowired存储库< SomeNode> someNodeRepository;如文件 here 。
工作正常，但我的问题是我如何可以根据泛型类型动态地做到这一点。
我想要做的是这样的：
public< ; T扩展节点> T saveNode（T节点）{存储库< T> repository = ctx.getBean（Repository.class，node.getClass（））; 返回repository.save（node）; }其中第二个参数是泛型类型。 这当然不起作用，尽管它编译了。
我找不到任何文档。
解决方案您可以这样做：
String [] beanNamesForType = ctx.getBeanNamesForType（ResolvableType.forClassWithGenerics（Repository.class，node.getClass（）））; //如果您希望有几个相同泛型类型的bean，可以根据需要提取它们。否则，只需取第一个 Repository< T> repository =（Repository< T>）ctx.getBean（beanNamesForType [0]）;
I have a bunch of repository beans that implement type Repository<T ? extends Node>. Now I can get a list of random nodes from the user and I want to get the appropriate repository for each node. Since Spring 4.0RC1 we can autowire repositories like this:
@Autowired Repository<SomeNode> someNodeRepository;As documented here.
This works fine, but my question is how I can do this dynamically based on the generic type.
What I want to do is something like:
public <T extends Node> T saveNode(T node) { Repository<T> repository = ctx.getBean(Repository.class, node.getClass()); return repository.save(node); }Where the second parameter is the generic type. This of course does not work, although it compiles.
I can't find any/the documentation on this.
解决方案You can do something like this:
String[] beanNamesForType = ctx.getBeanNamesForType(ResolvableType.forClassWithGenerics(Repository.class, node.getClass())); // If you expect several beans of the same generic type then extract them as you wish. Otherwise, just take the first Repository<T> repository = (Repository<T>) ctx.getBean(beanNamesForType[0]);
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