java - 使用Gson解析对象数组

Question

My Rest 服务产生如下响应

{
    "feeds": [
        {
            "id": 672,
            "imagePath": "http://pixyfi.com/uploads/image1.jpg",
            "description": "Off White Cotton Net^The Dress Is Made From Cotton Net. It Is Stretchable And The Material Is Really Good. It Is A Bodycon Dress.",
            "uploader": {
                "id": 459,

            },
            "rejected": false,
            "moderator": {
                "id": 95,
            },
            "moderatedOn": "2016-12-19"
            "imagePaths": [
                "uploads/image1.jpg"
            ]
        },
        {
            "id": 672,
            "imagePath": "http://pixyfi.com/uploads/mage2.jpg",
            "description": "Off White Cotton Net^The Dress Is Made From Cotton Net. It Is Stretchable And The Material Is Really Good. It Is A Bodycon Dress.",
            "uploader": {
                "id": 459,

            },
            "rejected": false,
            "moderator": {
                "id": 95,
            },
            "moderatedOn": "2016-12-19"
            "imagePaths": [
                "uploads/image2.jpg"
            ]
        }
    ]
}

如何用Gson解析它。在我的 Android 客户端中，我也有生成此 JSON 的相同 Feed 类。
注意:我已将 Spring boot 用于其余 API，并且此 JSON 是使用 ResponseEntity 生成的。

Answer 1

首先，确保您拥有有效的 JSON。上述内容在您的情况下无效。

如果 json 对象包含单个元素，则无需在其后放置逗号。 (主持人和上传者对象中id后面的逗号)。您需要删除它。此外，您还需要在 moderatedOn 值后面放置一个逗号。

现在，在您获得有效的类别后，您就拥有了一个 Feed 类。为了将您的 json feeds Array 映射到您的列表上。您需要执行以下操作。

Gson gson = new Gson();

Type feedsType = new TypeToken<ArrayList<Feed>>(){}.getType();

List<Feed> feedList = gson.fromJson(yourJsonResponseArray, feedsType); 

Your Classes are must be like these. Feed Class

public class Feed
{
    private String id;
    private String imagePath;
    private Moderator moderator;
    private String description;
    private String rejected;
    private Uploader uploader;
    private String moderatedOn;
    private String[] imagePaths;
    public String getId ()
    {
        return id;
    }
    public void setId (String id)
    {
        this.id = id;
    }
    public String getImagePath ()
    {
        return imagePath;
    }
    public void setImagePath (String imagePath)
    {
        this.imagePath = imagePath;
    }
    public Moderator getModerator ()
    {
        return moderator;
    }
    public void setModerator (Moderator moderator)
    {
        this.moderator = moderator;
    }
    public String getDescription ()
    {
        return description;
    }
    public void setDescription (String description)
    {
        this.description = description;
    }
    public String getRejected ()
    {
        return rejected;
    }
    public void setRejected (String rejected)
    {
        this.rejected = rejected;
    }
    public Uploader getUploader ()
    {
        return uploader;
    }
    public void setUploader (Uploader uploader)
    {
        this.uploader = uploader;
    }
    public String getModeratedOn ()
    {
        return moderatedOn;
    }
    public void setModeratedOn (String moderatedOn)
    {
        this.moderatedOn = moderatedOn;
    }
    public String[] getImagePaths ()
    {
        return imagePaths;
    }
    public void setImagePaths (String[] imagePaths)
    {
        this.imagePaths = imagePaths;
    }
}

Moderator Class

public class Moderator
{
    private String id;

    public String getId ()
    {
        return id;
    }

    public void setId (String id)
    {
        this.id = id;
    }
}

Uploader Class

public class Uploader
{
    private String id;

    public String getId ()
    {
        return id;
    }

    public void setId (String id)
    {
        this.id = id;
    }
}