java - "HttpMessageNotReadableException Required request body is missing"尝试发出发布请求时

Question

我有一个包含几个方法的 Controller 类，其中一个方法应该接受 POST 请求并使用来自该 POST 请求正文的 JSON 创建一个新帐户。

当我尝试使用 curl 发出 POST 请求时，我收到一个错误信息

{"timestamp":1493988808871,"status":400,"error":"Bad Request","exception":"org.springframework.http.converter.HttpMessageNotReadableException","message":"Required request body is missing: org.springframework.http.ResponseEntity<?> com.example.AccountRestController.add(java.lang.String,java.lang.String)","path":"/users/add"}

我正在使用的curl命令

curl -X POST --data '{"userName":"bepis", "password":"xyz"}' -H "Content-Type:application/json" http://localhost:8080/users/add

AccountRestController

@RequestMapping(method = RequestMethod.POST, value = "/add", produces = { MediaType.APPLICATION_JSON_VALUE})
ResponseEntity<?> add(@RequestBody String username, @RequestBody String password) {
    Account result = accountRepository.save(new Account (username, password));
    return new ResponseEntity<>(result, HttpStatus.CREATED);
}

Answer 1

您不能使用多个@RequestBody。您需要将所有内容包装到一个类中，该类将用于匹配您的请求正文。

同样的回答也是here .

还有一个JIRA issue对于被拒绝的功能请求。

注意:如果想少写一些，可以使用@PostMapping代替@RequestMapping(method = RequestMethod.POST)。

注意 @RequestParam 和@PathVariable 用于从 URI 中提取数据，而不是从正文中提取数据。

注意:这同样适用于 ASP.NET WebAPI 中的等效 [FromBody] 属性。

完整示例:

下面我创建了一个类似于您的案例的工作示例:

请求 DTO

public class AccountCreateRequest {

    private String userName;
    private String password;

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

响应DTO

public class AccountCreateResponse {

    private String userName;
    private String password;

    public AccountCreateResponse() {
    }

    public AccountCreateResponse(String userName, String password) {
        this.userName = userName;
        this.password = password;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

Controller

@RestController
@RequestMapping("/v1/account")
public class AccountController {

    @PostMapping(produces = MediaType.APPLICATION_JSON_VALUE)
    public @ResponseStatus(HttpStatus.CREATED) AccountCreateResponse add(@RequestBody() AccountCreateRequest account) {
        AccountCreateResponse response = new AccountCreateResponse(account.getUserName(), account.getPassword());
        return response;
    }
}

curl 请求

curl -X POST --data '{"userName":"bepis", "password":"xyz"}' -H "Content-Type:application/json" http://localhost:8080/v1/account