茴香豆的茴的写法-SpringBoot处理客户端请求的几种方式

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 {
    @Override
    public 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 {
    @Override
    public 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
  * */
 @Bean
 public 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。