How to can I parse this json?

Question

I am trying to parse the Json result returned from this url . I want to get title, content and thumbnail value. I tried to make a java class to Map those values .

import java.util.List;

public class Dbpediaresults {

  private Results results;

  public Results getResults() {
    return results;
  }

  public void setResults(Results results) {
    this.results = results;
  }

  public static class Results {
    private List<Bindings> bindings;

    public List<Bindings> getBindings() {
      return bindings;
    }

    public void setBindings(List<Bindings> bindings) {
      this.bindings = bindings;
    }

  }

  public static class Bindings {
    private List<Title> title;
    private List<content> content;
    private List<Thumbnail> thumbnail;

    /**
     * @return the title
     */
    public List<Title> getTitle() {
      return title;
    }

    public void setTitle(List<Title> title) {
      this.title = title;
    }

    public List<content> getContent() {
      return content;
    }

    public void setContent(List<content> content) {
      this.content = content;
    }

    public List<Thumbnail> getThumbnail() {
      return thumbnail;
    }

    public void setThumbnail(List<Thumbnail> thumbnail) {
      this.thumbnail = thumbnail;
    }

  }

  private static class Title {
    private String value;

    public String getValue() {
      return value;
    }

    public void setValue(String value) {
      this.value = value;
    }

  }

  private static class content {
    private String value;

    public String getValue() {
      return value;
    }

    public void setValue(String value) {
      this.value = value;
    }
  }

  private static class Thumbnail {
    private String value;

    public String getValue() {
      return value;
    }

    public void setValue(String value) {
      this.value = value;
    }
  }

}

I tried this to get the result but it isn't working.

Dbpediaresults results = new Gson().fromJson(input, Dbpediaresults.class);

Here input is a String of the json output returned from URL above.

Is my Dbpediaresults class is correct to map the title, content and thumbnail value? If not, how can I parse it correctly?

Answer 1

Gson will not break the Binding group into three separate lists like that. The easiest way to fix this would be to create containing a single List<Binding> , where Binding is a class that represents all three of title, content, and thumbnail. It's better to keep these together anyway as multiple parallel List s are a strong hint that there's a class waiting to be born.

Here's some sample code. In addition to fixing the problem, I made some other minor style and variable name changes (such as class Content being lowercase in your code, and removing the setters).

public class Dbpediaresults {
  private Results results;

  public Results getResults() {
    return results;
  }

  public void setResults(Results results) {
    this.results = results;
  }

  public static class Results {
    private List<Binding> bindings;

    public List<Binding> getBindings() {
      return bindings;
    }
  }

  public static class Binding {
    private Title title;
    private Content content;
    private Thumbnail thumbnail;

    public Title getTitle() {
      return title;
    }
    public Content getContent() {
      return content;
    }
    public Thumbnail getThumbnail() {
      return thumbnail;
    }
  }

  public static class Title {
    private String value;
    public String getValue() {
      return value;
    }
  }

  public static class Content {
    private String value;
    public String getValue() {
      return value;
    }
  }

  public static class Thumbnail {
    private String value;
    public String getValue() {
      return value;
    }
  }
}