The DispatcherServlet configuration needs to include a HandlerAdapter that supports this handler
今天遇到一個問題，
原因是@Controller註釋未生效，需在xml新增<mvc:annotation-driven />
<mvc:annotation-driven/>相當於註冊了DefaultAnnotationHandlerMapping和AnnotationMethodHandlerAdapter
這兩個bean，配置一些messageconverter。
所以當我們需要controller返回一個map的json物件時，一定要設定<mvc:annotation-driven />
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