JSON解析器通过春季启动应用程序在Openfire中创建用户时出错

Question

在我的项目中，我必须创建一个聊天框。为此，我必须使用明火服务器。我拥有在该服务器中创建用户的服务。当我试图从春季启动应用程序访问openfire服务时，我遇到了这个问题。我已经为用户创建了模型，还创建了服务并为其提供了实现

这是我的模型类

public class OpenFireUser  {
private String firstname;
private String username;
private String password;
private String email;
<----getters and setters--->
}

这是我的服务，

public UserCreationResponse createOpenFireUser(String authorization,User createUser) {
OpenFireUser user= new OpenFireUser();
user.setEmail(createUser.getEmail());
user.setFirstname(createUser.getFirstname().toLowerCase());
user.setPassword("Passw0rd");
user.setUsername(createUser.getUsername().toLowerCase());
UserCreationResponse response=new UserCreationResponse();
RestTemplate restTemplate = new RestTemplate();
try{
MultiValueMap<String, String> headers = new LinkedMultiValueMap<String, String>();
headers.add("Authorization", authorization);
headers.add("Content-Type", "application/json");
headers.add("Accept", "application/json");

restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
HttpEntity<OpenFireUser> requestObject = new HttpEntity<OpenFireUser>(user, headers);
ResponseEntity<String> responseEntity=restTemplate.postForEntity(OPENFIRE_REST_ENDPOINT, requestObject,String.class);
int statusCode = responseEntity.getStatusCodeValue();

if(statusCode==201){
response.setResponseCode(statusCode);
return response;
}else{
response.setResponseCode(MessageConstant.ResponseCode.ProcessFail.value());} 
return response;
}catch(HttpClientErrorException  clientErr){
response.setUserMessage(clientErr.getMessage());
response.setResponseCode(clientErr.getStatusCode().value());
response.setResponseMessage(MessageConstant.CodeMessage.ProcessFail.value());
return response;
}
catch(Exception e)
{   
response.setResponseCode(MessageConstant.ResponseCode.ProcessFail.value());
response.setResponseMessage(MessageConstant.CodeMessage.ProcessFail.value());
return response;
}
}

这是呼叫服务的控制器代码，

@RequestMapping(value = "/createOpenFireUser", method = RequestMethod.POST, consumes = "application/json;charset=UTF-8",produces = "application/json;charset=UTF-8")
public UserCreationResponse createOpenFireUser(@RequestBody User createUser) {
logger.debug("Entering inside createOpenFireUser(@RequestBody OpenFireUser createUser) method");
//logger.debug("Create user request :  {}" , createUserRequestEntity);
return userService.createOpenFireUser("authorizationKey",createUser);
}

当从邮递员发送数据时，我收到了错误，比如

Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Can not deserialize instance of com.exelatech.printshop.model.User out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of com.exelatech.printshop.model.User out of START_ARRAY token
at [Source: java.io.PushbackInputStream@6c88daca; line: 1, column: 1]
2018-07-20 15:59:13.535  WARN 9988 --- [nio-9090-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved exception caused by Handler execution: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Can not deserialize instance of model.User out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of model.User out of START_ARRAY token
at [Source: java.io.PushbackInputStream@6c88daca; line: 1, column: 1]

在邮递员上，我得到的回复是，

"timestamp": 1532082553781,
"status": 400,
"error": "Bad Request",
"exception": "org.springframework.http.converter.HttpMessageNotReadableException",
"message": "JSON parse error: Can not deserialize instance of model.User out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of model.User out of START_ARRAY tokenn at [Source: java.io.PushbackInputStream@6c88daca; line: 1, column: 1]",

有人能帮我解决问题吗？

Answer 1

通过邮递员发送对象时出错。以前我发送请求对象，比如

[
{
"firstname" : "Jyoti",
"username" : "JyotiNH",
"password":"Passw0rd",
"email" : "[e-mail]"
}
]

它是对象。但是我的方法接收参数作为字符串数组，所以，当我用如下结构的对象发送请求时，它成功地创建了用户。

{
"firstname" : "Jyoti",
"username" : "JyotiNH",
"password":"Passw0rd",
"email" : "[e-mail]"
}