带有反序列化列表对象的 Spring 控制器
@RequestMapping(value = "/tester/", method = RequestMethod.POST)
public String testingonly(@RequestBody List<EachObject> eachobjectlist) throws IOException {
然后我迭代eachobjectlist，但列表中的每个项目都是LinkedHashMap类型，它不是应该是“EachObject”类型吗？
@RequestMapping(value = "/tester/", method = RequestMethod.POST)
public String testingonly(@RequestBody List<EachObject> eachobjectlist) throws IOException {
then i do iterate eachobjectlist, but each item inside the list is type LinkedHashMap, arent it suppose to be "EachObject" type ?
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由于运行时类型擦除，泛型类型EachObject在运行时不存在。 Spring 将无法确定此信息。 Spring只知道参数有一个原始类型List，并且它将注入任何类型的List。根据@axtavt，方法参数的泛型类型是可以访问，但是Spring可能没有实现这个，并且将来可能不会实现。这是因为泛型类型可以是接口或抽象类，Spring 将无法创建给定接口或抽象类的相应实现。例如，如果您请求
Fruit列表，并且有两个几乎相同的Fruit子类，则无法确定要使用哪个子类。Due to type erasure at runtime, the generic typeEachObjectis not present at runtime. Spring will not be able to determine this information. Spring only knows that the argument has a raw typeListand it will inject aListof any type.According to @axtavt, generic types of method's arguments are accessible but Spring may not have this implemented and probably won't be implemented in the future. This is because generic type can be interface or abstract class and Spring will not be able to create a corresponding implementation of a given interface or abstract class. For example, if you request for a list of
Fruitand there are two almost identical subclasses ofFruit, dertemining which subclass to be used will not be possible.