Question

我正在尝试解析the Json result returned from this url。我想获得标题，内容和缩略图值。我试图创建一个java类来映射这些值。

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;
    }
  }

}

我试过这个以获得结果，但它没有工作。

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

此处输入是从上面的URL返回的json输出的String。

我的Dbpediaresults类是否正确映射标题，内容和缩略图值？如果没有，我该如何正确解析它？

Answer 1

Gson不会将List<Binding>组分成三个单独的列表。解决此问题的最简单方法是创建包含单个Binding，其中List是一个代表所有三个标题，内容和缩略图的类。最好将这些保持在一起，因为多个并行class Content是strong hint that there's a class waiting to be born.

这是一些示例代码。除了解决问题之外，我还进行了一些其他次要样式和变量名称更改（例如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; } } }在代码中为小写，并删除了setter。）

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如何解析这个json？

1 个答案: