如何将JSON对象发布到spring控制器? [英] How to POST JSON object to spring controller?

问题描述

我有弹簧控制器:

@RequestMapping(value = "/add", method = RequestMethod.POST, 
     consumes = "application/json")
public @ResponseBody ResponseDto<Job> add(User user) {
    ...
}

我可以使用APACHE HTTP CLIENT张贴这样的对象:

I can POST the object like this with APACHE HTTP CLIENT:

HttpPost post = new HttpPost(url);
List nameValuePairs = new ArrayList();
nameValuePairs.add(new BasicNameValuePair("name", "xxx"));
post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = client.execute(post);

在控制器中，我获得了名称为"xxx"的用户

In controller I get user with name "xxx"

现在，我想创建User对象并将其发布到服务器， 我试图与这样的GSON对象一起使用:

Now I want to create User object and post it to the server, I tried to use with GSON object like this :

User user = new User();
user.setName("yyy");

Gson gson = new Gson();
String json = gson.toJson(user);

HttpClient client = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
StringEntity entity = new StringEntity(json.toString(), HTTP.UTF_8);
entity.setContentType("application/json");
httpPost.setEntity(entity);
HttpResponse response = client.execute(httpPost);

但是通过这种方式，我进入了具有空字段的服务器User对象...

But in this way I get in server User object with null fields...

我该如何解决?

推荐答案

好，您缺少一些东西:

1. 确保您要在客户端和服务器上以相同的方式将User序列化和反序列化为json.
2. 如果您想使用spring内置的jackson支持(最好也可以在客户端上使用)或确保对Gson包含适当的HttpMessageConverter，请确保在类路径上具有jackson库.您可以使用

1. Make sure you are serializing and deserializing User to json the same way on the client and server.
2. Make sure to have jackson libraries on the classpath if you want to use spring built-in jackson support (and preferably use that on the client as well) or include apropriate HttpMessageConverter for Gson. You can use GsonHttpMessageConverter from spring-android for that.
3. Annotate your request handler method parameter with @RequestBody.
4. In case of using jackson, as @ararog mentioned, make sure that you specifically exclude fields that can be ingored or annotate the whole User class with @JsonIgnoreProperties(ignoreUnknown = true)

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