休息 API 端點

Question

為什么我不能在 @RequestParam 之后使用TreeMap<String,String> ？ 當我使用時它有效

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);
    }

這是我看到的錯誤：

java.lang.IllegalStateException: argument type mismatch
HandlerMethod 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 在映射抽象類型 Map 時使用 LinkedHashMap 作為默認類型值。 您可以自定義您的 ObjectMapper，注冊自定義模塊。

ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule("custom", Version.unknownVersion());
module.addAbstractTypeMapping(Map.class, TreeMap.class);
mapper.registerModule(module);