无法写入请求:找不到适合请求类型[org.json.JSONObject]和内容类型[application/json]的HttpMessageConverter [英] Could not write request: no suitable HttpMessageConverter found for request type [org.json.JSONObject] and content type [application/json]
问题描述
我正在努力尝试将带有JSON有效负载的POST请求发送到远程服务器.
I'm digging myself in trying to send a POST request with a JSON payload to a remote server.
此GET curl命令可以正常工作:
This GET curl command works fine:
curl -H "Accept:application/json" --user aaa@aaa.com:aaa "http://www.aaa.com:8080/aaa-project-rest/api/users/1" -i
这个POST也可以正常工作:
And this POST one works fine too:
curl -H "Accept:application/json" -H "Content-Type: application/json" "http://www.aaa.com:8080/aaa-project-rest/api/users/login" -X POST -d "{ \"email\" : \"aaa@aaa.com\", \"password\" : \"aaa\" }" -i
所以我想在我的Android应用中模仿它.
And so I'm trying to mimic it in my Android app.
该应用程序在第一个GET请求上运行良好,但在第二个POST请求上给出了400错误请求.
The app works fine on the first GET request but gives a 400 Bad Request on the second POST one.
以下是适用于GET请求的代码:
Here is the code that works for the GET request:
RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
HttpHeaders httpHeaders = Common.createAuthenticationHeaders("aaa@aaa.com" + ":" + "aaa");
User user = null;
ResponseEntity<User> responseEntity = restTemplate.exchange("http://" + REST_HOST + ":8080/aaa-project-rest/api/users/" + 1L, HttpMethod.GET, new HttpEntity<Object>(httpHeaders), User.class);
这是POST请求的源代码:
Here is the source code for the POST request:
RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
User user = null;
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
httpHeaders.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
JSONObject jsonCredentials = new JSONObject();
jsonCredentials.put("email", REST_LOGIN);
jsonCredentials.put("password", REST_PASSWORD);
ResponseEntity<User> responseEntity = restTemplate.exchange("http://" + REST_HOST + ":" + REST_PORT + "/" + REST_APP + "/api/users/login",
HttpMethod.POST, new HttpEntity<Object>(jsonCredentials, httpHeaders), User.class);
但是它给出了消息:
Could not write request: no suitable HttpMessageConverter found for request type [org.json.JSONObject] and content type [application/json]
这是Spring REST控制器:
Here is the Spring REST controller:
@RequestMapping(value = RESTConstants.SLASH + RESTConstants.LOGIN, method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public ResponseEntity<UserResource> login(@Valid @RequestBody CredentialsResource credentialsResource, UriComponentsBuilder builder) {
HttpHeaders responseHeaders = new HttpHeaders();
User user = credentialsService.checkPassword(credentialsResource);
userService.clearReadablePassword(user);
if (user == null) {
return new ResponseEntity<UserResource>(responseHeaders, HttpStatus.NOT_FOUND);
} else {
tokenAuthenticationService.addTokenToResponseHeader(responseHeaders, credentialsResource.getEmail());
responseHeaders.setLocation(builder.path(RESTConstants.SLASH + RESTConstants.USERS + RESTConstants.SLASH + "{id}").buildAndExpand(user.getId()).toUri());
UserResource createdUserResource = userResourceAssembler.toResource(user);
ResponseEntity<UserResource> responseEntity = new ResponseEntity<UserResource>(createdUserResource, responseHeaders, HttpStatus.CREATED);
return responseEntity;
}
}
@RequestMapping(value = RESTConstants.SLASH + "{id}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public ResponseEntity<UserResource> findById(@PathVariable Long id, UriComponentsBuilder builder) {
HttpHeaders responseHeaders = new HttpHeaders();
User user = userService.findById(id);
if (user == null) {
return new ResponseEntity<UserResource>(responseHeaders, HttpStatus.NOT_FOUND);
} else {
UserResource userResource = userResourceAssembler.toResource(user);
responseHeaders.setLocation(builder.path(RESTConstants.SLASH + RESTConstants.USERS + RESTConstants.SLASH + "{id}").buildAndExpand(user.getId()).toUri());
ResponseEntity<UserResource> responseEntity = new ResponseEntity<UserResource>(userResource, responseHeaders, HttpStatus.OK);
return responseEntity;
}
}
CredentialsResource类代码:
The CredentialsResource class code:
public class CredentialsResource extends ResourceSupport {
@NotEmpty
@Email
private String email;
@NotEmpty
private String password;
public CredentialsResource() {
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
推荐答案
回复很晚,尽管我遇到了同样的问题,花了一些时间来解决.因此,我认为最好共享它并跟踪我的解决方案.
Quite late to reply, though I've just hitten the same problem and took me some time to solve it. So, I think I'd better share it and keep track of my solution.
实际上,引发的异常完全具有误导性.原来的问题不是MappingJackson2HttpMessageConverter
不知道如何编组我的对象(听起来很奇怪,是JSON),而是底层ObjectMapper
的配置.
Actually, the exception thrown is totally misleading. Turned out the problem is not that the MappingJackson2HttpMessageConverter
didn't know how to marshall my object -which sounded strange, being JSON-, but a configuration of the underlying ObjectMapper
.
我要做的是禁用这样的属性SerializationFeature.FAIL_ON_EMPTY_BEANS
What I did is to disable the property SerializationFeature.FAIL_ON_EMPTY_BEANS
like that
restTemplate = new RestTemplate();
MappingJackson2HttpMessageConverter jsonHttpMessageConverter = new MappingJackson2HttpMessageConverter();
jsonHttpMessageConverter.getObjectMapper().configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
restTemplate.getMessageConverters().add(jsonHttpMessageConverter);
一切都按预期开始.
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