休息 API 端点

Question

为什么我不能TreeMap<String,String>在 @RequestParam 之后使用 ？当我使用时它有效Map<String,String>例子： @RequestMapping(value = "customers/new", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE)        public ResponseEntity<String> createAuthorizationRole(        @RequestParam TreeMap<String, String> hierarchy,        @RequestHeader(name = "userid") String userid,        @RequestHeader(name = "clientid") String clientid,        @RequestHeader(name = "authorization") String authToken) {        return new ResponseEntity<>("new Customer created", HttpStatus.OK);    }这是我看到的错误：java.lang.IllegalStateException: argument type mismatchHandlerMethod details: Controller [com.demo.customer.odr.pc.branchAuthorization.BranchAuthorizationController]Method [public org.springframework.http.ResponseEntity<java.lang.String> com.walmart.replenishment.odr.pc.branchAuthorization.BranchAuthorizationController.createAuthorizationRole(java.util.TreeMap<java.lang.String, java.lang.String>,java.lang.String,java.lang.String,java.lang.String)]Resolved arguments: [0] [type=java.util.LinkedHashMap] [value={country=US, division=1, department=17, category=9295, subcategory=21032, subclass=0, fineline=9379}][1] [type=java.lang.String] [value=office\r0sss][2] [type=java.lang.String] [value=05af7587-2209-49e3-9193-64828ad240b3][3] [type=java.lang.String] [value=dhfdrNGXU7j19DZb]

Answer 1

Jackson 在映射抽象类型 Map 时使用 LinkedHashMap 作为默认类型值。您可以自定义您的 ObjectMapper，注册自定义模块。

ObjectMapper mapper = new ObjectMapper();

SimpleModule module = new SimpleModule("custom", Version.unknownVersion());

module.addAbstractTypeMapping(Map.class, TreeMap.class);

mapper.registerModule(module);