java - Spring RestController 不明确的映射错误

Question

我正在 Spring 中设置 RestController，但有一个不明确的映射问题。我不明白最后两个方法有什么歧义，因为请求映射和方法名称不同。当我从最后一个方法中删除方法规范时，问题就不再存在了。

这是我的 Controller :

@RestController
public class TagController {

    @Autowired
    private TagService tagService;

    @RequestMapping(name = "/tag/list", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<TagList> getTagList() {
        TagList result = new TagList(tagService.list());
        return new ResponseEntity<TagList>(result, HttpStatus.OK);
    }

    @RequestMapping(name = "/tag/add", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<?> addTag(@RequestBody AlterTagForm form) {
        try {
            tagService.addTag(form.getArticleId(), form.getTagName());
            return new ResponseEntity<>(HttpStatus.ACCEPTED);
        } catch (EntityNotFoundException ex) {
            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
        }
    }

    @RequestMapping(name = "/tag/remove", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<?> removeTag(@RequestBody AlterTagForm form) {
        try {
            tagService.removeTag(form.getArticleId(), form.getTagName());
            return new ResponseEntity<>(HttpStatus.ACCEPTED);
        } catch (EntityNotFoundException ex) {
            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
        }
    }
}

这会导致此错误:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping found. Cannot map 'tagController' bean method 
public org.springframework.http.ResponseEntity<?> com.example.article.controller.TagController.removeTag(com.example.admin.form.AlterTagForm)
to {[],methods=[POST],params=[],headers=[],consumes=[],produces=[application/json],custom=[]}: There is already 'tagController' bean method
public org.springframework.http.ResponseEntity<?> com.example.article.controller.TagController.addTag(com.example.admin.form.AlterTagForm) mapped.

Answer 1

在您的@RequestMapping注释中，您应该使用value属性设置路径。 value 属性确定您的方法应处理的路径，而 name 属性仅用于标识 Spring 环境中的映射。

您的方法 addTag() 和 removeTag() 目前都映射到 Controller 的索引路径 (/)，并且从那时起它们在各方面都很相似(方法、生成、参数)，除了名称之外，Spring 喊犯规了。