使用Jackson进行内部静态对象反序列化

Question

I'm trying to deserialize json like this:

{ "User.getToken": { "code": "200", "token": "0155649ce3ea4be98da9fc29376d8688", "user_name": "Andruw137", "user_avatar": "https://text.com/images/avatar/_/81546.png" } }

with these lines of code:

ObjectMapper mapper = new ObjectMapper(); 

TokenRequest tokenRequest = mapper.readValue(String.valueOf(response), TokenRequest.class);

and this:

public class TokenRequest {

@JsonProperty("User.getToken")
public User user = new User();

public User getUser() {
    return user;
}

public void setUser(User user) {
    this.User = user;
}

static class User {
    int code;
    String token;
    String user_name;
    String user_avatar;

    public int getCode() {
        return code;
    }

    public String getToken() {
        return token;
    }

    public String getUser_name() {
        return user_name;
    }

    public String getUser_avatar() {
        return user_avatar;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public void setToken(String token) {
        this.token = token;
    }

    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }

    public void setUser_avatar(String user_avatar) {
        this.user_avatar = user_avatar;
    }
}

}

I've read through documentation but still getting error:

com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type [simple type, class ru.amdm.amdm.authorization.TokenRequest] from Integral number (404); no single-int-arg constructor/factory method
                                                              at [Source: 404 .1; line: 1, column: 1]

I'd like to understand what that error message means and how to actually get such a json deserialized. Thanks in advance for any help.

Answer 1

You are trying to deserialize a string "code": "200" into an integer. This will work if you remove the quotes: "code": 200 .

Also, please add @JsonProperty("json_name") annotation to the object fields and name them using standard camel case:

@JsonProperty("user_avatar") String userAvatar;