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方式1：@Controller或者@RestController

/*** 方式1：@Controller* */
@RestController
public class AtController {@GetMapping("/at")public String at() {return "@Controller";}
}

方式2：@Component + Controller接口

/*** 方式2：@Component + Controller接口* */
@Component("/interface")
public class InterfaceController implements Controller {@Overridepublic ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {response.setContentType("text/html;charset=utf-8");response.getOutputStream().write("Controller implements interface".getBytes(StandardCharsets.UTF_8));return null;}
}

方式3：@Component + HttpRequestHandler

/*** 方式3：@Component + HttpRequestHandler* */
@Component("/httpRequestHandler")
public class HttpRequestHandlerController implements HttpRequestHandler {@Overridepublic void handleRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");response.getOutputStream().write("Controller implements HttpRequestHandler".getBytes(StandardCharsets.UTF_8));}
}

方式4：@Bean + RouterFunction

/*** 方式4：RouterFunction，WebFlux也有类似的方式* */@Beanpublic RouterFunction routerFunction(){return RouterFunctions.route().GET("/routerFunction",request-> ServerResponse.ok().contentType(MediaType.TEXT_HTML).body("Controller using RouterFunction")).build();}

知道这些方式有啥用呢？有些时候，我们需要在starter中内置一些controller，但是又不想被其他的组件扫描到（比如swagger），这个时候用处就来了。