I have the exact same JSON representation as here: https://newsapi.org/docs/endpoints/top-headlines
To deserialize this into java objects I have created a News
and a Article
class. News
contains multiple Articles
. So here are my classes:
News:
public class News {
private String status;
private int totalResults;
private Article[] articles;
public News() {
}
public News(String status, int totalResults, Article[] articles) {
this.status = status;
this.totalResults = totalResults;
this.articles = articles;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public int getTotalResults() {
return totalResults;
}
public void setTotalResults(int totalResults) {
this.totalResults = totalResults;
}
public Article[] getArticles() {
return articles;
}
public void setArticles(Article[] articles) {
this.articles = articles;
}
}
Article:
public class Article {
private String source;
private String author;
private String title;
private String description;
private String url;
private String imageUrl;
private String publishedAt;
private String content;
public Article() {
}
public Article(String source, String author, String title, String description, String url, String imageUrl,
String publishedAt, String content) {
this.source = source;
this.author = author;
this.title = title;
this.description = description;
this.url = url;
this.imageUrl = imageUrl;
this.publishedAt = publishedAt;
this.content = content;
}
public String getSource() {
return source;
}
public void setSource(String source) {
this.source = source;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getImageUrl() {
return imageUrl;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
public String getPublishedAt() {
return publishedAt;
}
public void setPublishedAt(String publishedAt) {
this.publishedAt = publishedAt;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
Now I am using the com.fasterxml.jackson.databind.ObjectMapper
as following to deserialize the JSON representation into a News
object:
ObjectMapper objectMapper = new ObjectMapper();
News news = objectMapper.readValue(response.toString(), News.class);
Here I am getting a com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.lang.String` out of START_OBJECT token
The problem apparently is the array of articles representated in JSON. I have read about arrays deserialization in jackson but I found nothing about deserialization of objects that contain properties AND array of objects. https://www.baeldung.com/jackson-deserialization
How do I do this properly using the ObjectMapper
? Am I missing out on something? Any help is appreciated, thanks!
Your source mapping is wrong, the source
field is of format
source": {
"id": "google-news",
"name": "Google News"
}
this can be replaced with
public class Source {
private String id;
private String name;
public Source() {}
public Source(String id, String name) {
this.id = id;
this.name = name;
}
}
and replace
private String source;
with
private Source source;
in the Article
class
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments