如何使用Java订阅RSS Feed？

public class NewsArticle {    private String title;    private String link;    private String imgUrl;    private List categories;

    public String getPublishedDate() {        return publishedDate;    }

    public void setPublishedDate(String publishedDate) {        this.publishedDate = publishedDate;    }

    private String publishedDate;

    public String getTitle() {        return title;    }

    public void setTitle(String title) {        this.title = title;    }

    public String getLink() {        return link;    }

    public void setLink(String link) {        this.link = link;    }

    public String getImgUrl() {        return imgUrl;    }

    public void setImgUrl(String imgUrl) {        this.imgUrl = imgUrl;    }

    public List getCategories() {        return categories;    }

    public void setCategories(List categories) {        this.categories = categories;    }

    @Override    public String toString() {        return "NewsArticle{" +                "title='" + title + '\'' +                ", link='" + link + '\'' +                ", imgUrl='" + imgUrl + '\'' +                ", categories=" + categories +                ", publishedDate='" + publishedDate + '\'' +                '}';    }}