DispatcherServlet 配置需要包含一个支持这个处理程序的 HandlerAdapter

Question

我正在尝试设计一个rest api，下面是我的控制器代码。

当我调用http://localhost:8080/ 时，响应很好，但是如果我点击http://localhost:8080/api/ca它会触发javax.servlet.ServletException: No adapter for handler [...CaDetailController@48224381]: The DispatcherServlet configuration needs to include a HandlerAdapter that supports this handler

@RestController("/api")
public class CaDetailController {

    private static final Logger logger = LoggerFactory.getLogger(GetClassLoader.class.getClass());

    @Autowired
    CaService caService;

    @RequestMapping(path = "/ca", method = RequestMethod.GET)
    public @ResponseBody List<CaDetail> getCorporateActions() {
        logger.info("CaDetailController.findAllCaDetails()");
        return caService.findAllCaDetails();
    }

    @RequestMapping(path = "/ca/{caId}", method = RequestMethod.GET)
    public @ResponseBody List<CaDetail> getCorporateActions(@PathParam("caId") long caId) {
        logger.info("CaDetailController.getCorporateActions() : caId : " + caId);
        return caService.findAllCaDetails();
    }
}

更新了控制器。

@RestController
@RequestMapping("/api/ca")
public class CaDetailController {

    private static final Logger logger = LoggerFactory.getLogger(GetClassLoader.class.getClass());

    @Autowired
    CaService caService;

    @GetMapping(path = "/")
    public @ResponseBody List<CaDetail> getCorporateActions() {
        logger.info("CaDetailController.findAllCaDetails()");
        return caService.findAllCaDetails();
    }

    @GetMapping(path = "/{caId}")
    public @ResponseBody List<CaDetail> getCorporateActions(@PathParam("caId") Long caId) {
        logger.info("CaDetailController.getCorporateActions() : caId : " + caId);
        return caService.findAllCaDetails();
    }
}

Answer 1

为清楚起见，修复是：

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
@RequestMapping("/api/ca")
public class CaDetailController {

    @GetMapping
    public String healthcheck1() {
        return "ok!";
    }

    @GetMapping(path = "health")
    public String healthcheck2() {
        return "ok again!";
    }

}

您可以使用 URL 调用此端点： http://localhost:8080/api/ca和 http://localhost:8080/api/ca/health

（假设默认 Spring Boot Tomcat 配置）。

Answer 2

不要将 ("/api") 值添加到 @RestController Annotation，将其添加到 @RequestMapping

@RestController
@RequestMapping("api/")
...

Answer 3

尝试这个

@RestController
@RequestMapping("/api")
public class CaDetailController {

代替

@RestController("/api")
public class CaDetailController {