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 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);