如何用gson解析这个问题

Question

Here's the json data (I have no control over this)

{
"colors": {
    "668": {
        "name": "Pink Ice",
        "base_rgb": [
            128,
            26,
            26
        ],
        "cloth": {
            "brightness": 50,
            "contrast": 1.36719,
            "hue": 8,
            "saturation": 0.351563,
            "lightness": 1.36719,
            "rgb": [
                216,
                172,
                164
            ]
        },
        "leather": {
            "brightness": 47,
            "contrast": 1.71875,
            "hue": 8,
            "saturation": 0.234375,
            "lightness": 1.71875,
            "rgb": [
                207,
                170,
                163
            ]
        },
        "metal": {
            "brightness": 47,
            "contrast": 1.64063,
            "hue": 8,
            "saturation": 0.429688,
            "lightness": 1.48438,
            "rgb": [
                211,
                145,
                134
            ]
        }
    }
},
"657": {
    "name": "Pastel Pink",
    "base_rgb": [
        128,
        26,
        26
    ],
    "cloth": {
        "brightness": 52,
        "contrast": 1.40625,
        "hue": 8,
        "saturation": 0.585938,
        "lightness": 1.40625,
        "rgb": [
            247,
            170,
            157
        ]
    },
    "leather": {
        "brightness": 52,
        "contrast": 1.40625,
        "hue": 8,
        "saturation": 0.546875,
        "lightness": 1.40625,
        "rgb": [
            243,
            172,
            159
        ]
    },
    "metal": {
        "brightness": 47,
        "contrast": 1.5625,
        "hue": 8,
        "saturation": 0.546875,
        "lightness": 1.40625,
        "rgb": [
            220,
            141,
            126
        ]
    }
}

}

I can't for the life of me figure out how to construct the classes to store this. The "668" (id num) is my stumbling block.

I know asking for help without showing what i've tried isn't good form, but nothing i've tried has even come close, and it would just take up lots of space to get nowhere.

Answer 1

Your class hierarchy would have the following skeleton

public class Holder {
    private Colors colors;
}

public class Colors {
    private Map<String, Item> map;
}

public class Item {
    private String name;
    private int[] base_rgb;
    private Cloth cloth;
    ... // more
}

public class Cloth {
    private int brightness;
    private float contrast;
    private int hue;
    private float saturation;
    private float lightness;
    private int[] rgb;
}

You'll need classes for Metal and Leather and others.

The class Holder above would have been the one serialized to the JSON you've posted. If you don't want to name your fields like base_rgb (doesn't follow convention), you can use library specific annotations like @JsonProperty (not Gson) with a name attribute to give them a JSON name and name the field whatever you want.

Gson also provides a JsonSerializer and JsonDeserializer to really customize serialization/deserialization.