Spring WebMVC初始化Controller流程详解

public interface InitializingBean {
    void afterPropertiesSet() throws Exception;
}

public void afterPropertiesSet() {
    this.initHandlerMethods();
}
protected void initHandlerMethods() {
    String[] var1 = this.getCandidateBeanNames();//1.获取容器初始化的所有beanName
    int var2 = var1.length;
    for(int var3 = 0; var3 < var2; ++var3) {
        String beanName = var1[var3];
        if (!beanName.startsWith("scopedTarget.")) {
            this.processCandidateBean(beanName);//2.获取所有声明为Controller类的beanName
        }
    }
    this.handlerMethodsInitialized(this.getHandlerMethods());
}

protected String[] getCandidateBeanNames() {
    return this.detectHandlerMethodsInAncestorContexts ? BeanFactoryUtils.beanNamesForTypeIncludingAncestors(this.obtainApplicationContext(), Object.class) : this.obtainApplicationContext().getBeanNamesForType(Object.class);
}

protected void processCandidateBean(String beanName) {
    Class beanType = null;
    try {
        beanType = this.obtainApplicationContext().getType(beanName);//获取bean的类型
    } catch (Throwable var4) {
        if (this.logger.isTraceEnabled()) {
            this.logger.trace("Could not resolve type for bean '" + beanName + "'", var4);
        }
    }
    if (beanType != null && this.isHandler(beanType)) {//获取所有声明为Controller类的beanName
        this.detectHandlerMethods(beanName);//1.开始处理这种类型的beanName
    }
}

protected void detectHandlerMethods(Object handler) {
    Class<?> handlerType = handler instanceof String ? this.obtainApplicationContext().getType((String)handler) : handler.getClass();
    if (handlerType != null) {
        Class<?> userType = ClassUtils.getUserClass(handlerType);
        Map<Method, T> methods = MethodIntrospector.selectMethods(userType, (method) -> {
            try {
                return this.getMappingForMethod(method, userType);//1.获取到类类型下所有的方法
            } catch (Throwable var4) {
                throw new IllegalStateException("Invalid mapping on handler class [" + userType.getName() + "]: " + method, var4);
            }
        });
        if (this.logger.isTraceEnabled()) {
            this.logger.trace(this.formatMappings(userType, methods));
        }
        methods.forEach((method, mapping) -> {
            Method invocableMethod = AopUtils.selectInvocableMethod(method, userType);
            this.registerHandlerMethod(handler, invocableMethod, mapping);//注册并填充map
        });
    }
}

urlLookup.add(url, mapping);
eg:url = '/test/test.do' 

eg:key = 'url'  value = 'method'

private static Boolean isStart = false;

if(!isStart){
　　//进行初始化
　　isStart=true;
}

@PostConstruct
private void init(){
//进行初始化
}