java - springboot 返回 responseentity 返回 JSON

Question

我想在下面返回 JSON。

{ "name": "jackie" }

postman 给我错误。说明

Unexpected 'n'

这里是 Spring Boot 的新手。 1日龄。有没有正确的方法来做到这一点？

   // POST method here
    @RequestMapping(method = RequestMethod.POST , produces = "application/json")
    ResponseEntity<?> addTopic(@RequestBody Topic topic) {

        if (Util.save(topicRepository, new Topic(topic.getTopicName(), topic.getQuestionCount())) != null) {
            return Util.createResponseEntity("Name : jackie", HttpStatus.CREATED);
        }
        return Util.createResponseEntity("Error creating resource", HttpStatus.BAD_REQUEST);
    }

Answer 1

这是我用的:

@GetMapping(produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Map<String, String>> hello() {
    try {
        Map<String, String> body = new HashMap<>();
        body.put("message", "Hello world");
        return new ResponseEntity<>(body, HttpStatus.OK);
    } catch (Exception e) {
        return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
    }
}