1 finishBeanFactoryInitialization->preInstantiateSingletons
2
3 在preInstantiateSingletons的getBean()的方法中会实例化带有@RequestMapping、@Controller、@RestController的bean,
4 detectHandlerMethods
5
6 protected void detectHandlerMethods(Object handler) {
7 Class<?> handlerType = (handler instanceof String ?
8 obtainApplicationContext().getType((String) handler) : handler.getClass());
9
10 if (handlerType != null) {
11 Class<?> userType = ClassUtils.getUserClass(handlerType);
12 Map<Method, T> methods = MethodIntrospector.selectMethods(userType,
13 (MethodIntrospector.MetadataLookup<T>) method -> {
14 try {
15 return getMappingForMethod(method, userType);
16 }
17 catch (Throwable ex) {
18 throw new IllegalStateException("Invalid mapping on handler class [" +
19 userType.getName() + "]: " + method, ex);
20 }
21 });
22 if (logger.isTraceEnabled()) {
23 logger.trace(formatMappings(userType, methods));
24 }
25 //循环遍历controller类中的接口方法，会把接口的URL作为key,接口的具体方法等信息作为value存入一个map中
26 //private final Map<T, MappingRegistration<T>> registry = new HashMap<>();
27
28 methods.forEach((method, mapping) -> {
29 Method invocableMethod = AopUtils.selectInvocableMethod(method, userType);
30 registerHandlerMethod(handler, invocableMethod, mapping);
31 });
32 }
33 }
