一个人如果抛弃他忠实的朋友，就等于抛弃他最珍贵的声明。——索福克勒斯
代码如下：
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| public static Map<String, Type> getGenericMap(Type paramType) {
Type type = resolveType(paramType);
if (type instanceof ParameterizedTypeImpl) {
ParameterizedTypeImpl ty = (ParameterizedTypeImpl) type;
final Class<?> rawType = ty.getRawType();
return Steam.of(rawType.getTypeParameters()).map(Type::getTypeName)
.zip(Steam.of(ty.getActualTypeArguments()), Maps::entry)
.collect(Collective.entryToMap(LinkedHashMap::new));
}
return new HashMap<>();
}
private static Type resolveType(Type paramType) {
Type type;
for (type = paramType;
type instanceof Class;
type = ((Class<?>) type).getGenericSuperclass()) {
if (Object.class.equals(type)) {
Type[] genericInterfaces = ((Class<?>) type).getGenericInterfaces();
if (genericInterfaces.length > 0 && Objects.nonNull(genericInterfaces[0])) {
type = genericInterfaces[0];
}
}
}
return type;
}
|
使用如下：
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| @Test
void testGetGenericMap() {
final Map<String, Type> genericMap = ReflectHelper.getGenericMap(new HashMap<String, TreeMap<String, Object>>() {
}.getClass());
Assertions.assertEquals(String.class, genericMap.get("K"));
Assertions.assertEquals(ParameterizedTypeImpl.make(TreeMap.class, new Type[]{String.class, Object.class}, null), genericMap.get("V"));
}
|
源码地址：https://gitee.com/VampireAchao/stream-query/blob/master/stream-core/src/main/java/io/github/vampireachao/stream/core/reflect/ReflectHelper.java