使用 Spring 引导发布 JSON 值时出现问题

Question

I am trying to make a post request using json but in postman the request is successful only if I make the request like this: email@example.com . If I make a request using the standard JSON format {"email":"email@example.com"} I get "invalid email id". I should mention that content type application/json header is checked in postman, and I am making the request in body/raw.

I have tried messing with @RequestBody / @RequestParam annotations, using consumes = "application/json" but I am unsuccessful and I couldn't find a similar issue after lots of googling either.

my controller:

@RestController
public class UserController {

@Autowired
private UserService userService;

@PostMapping(value = "/forgot-password", consumes = "application/json")
public String forgotPassword(@RequestBody String email) {

    String response = userService.forgotPassword(email);

    if (!response.startsWith("Invalid")) {
        response = "http://localhost:8080/reset-password?token=" + response;
    }
    return response;
}

user service:

public String forgotPassword(String email) {

    Optional<User> userOptional = Optional
            .ofNullable(userRepository.findByEmail(email));

    if (!userOptional.isPresent()) {
        return "Invalid email id.";
    }

    User user = userOptional.get();
    user.setToken(generateToken());
    user.setTokenCreationDate(LocalDateTime.now());

    user = userRepository.save(user);

    return user.getToken();
}

Answer 1

Simply put, the @RequestBody annotation maps the HttpRequest body to a transfer or domain object.You need to put object instead of String

Your endpoint should be like Below.

@PostMapping(value = "/forgot-password", consumes = "application/json")
public String forgotPassword(@RequestBody EmailDto email) {

    String response = userService.forgotPassword(email.getEmail);
    // ...
    return response;
}

Your DTO should be like below

public class EmailDto {

    private String email; 
    //Getters and Setters      
}

Answer 2

You should have Email model with string property email .

public EmailPayload {

  String email;
.....

Then it will work (it will fit json you provided). Ofcouse class name can be different, only thing that must match is email property, then in your Controller your @RequestBody will be this class, and not String you have now.