Java 如何读取json文件，并使用GSON将其转换为POJO

我需要将值从json文件传递到java类，json文件如下示例：

    {
        "id":1,
        "name":"Gold",
        "description":"Shiny!",
        "spriteId":1,
        "consumable":true,
        "effectsId":[1]
    },

我需要绘制地图，我做到了：

Items i = new Items();


Map<String, Items> mapaNomes = new HashMap<String, Items>();
mapaNomes.put("Gold",i);
mapaNomes.put("Apple",i );
mapaNomes.put("Clain Mail",i );

1.为Json创建POJO表示。 我发现这个工具可以方便地将json转换为POJO

2.读取您的file.json。把它变成物体 奖金 我认为您的file.json中可能有许多json对象，例如：

{
    "id":1,
    "name":"Gold",
    "description":"Shiny!",
    "spriteId":1,
    "consumable":true,
    "effectsId":[1]
},
...
{
    "id":999,
    "name":"Silver",
    "description":"Whatever!",
    "spriteId":808,
    "consumable":true,
    "effectsId":[2]
},

如果是这种情况，则可以执行以下操作：

JsonReader reader = new JsonReader(new FileReader("file.json"));
List<MapaNomes> mapaNomeses = new Gson().fromJson(
                                reader, 
                                new TypeToken<List<Review>>() {}.getType());

Then you can do whatever you want with each and every one of them

for (MapaNomes mapaNomes : mapaNomeses) {
    // whatever
}

JsonReader=newjsonreader（newfilereader（“file.json”）；
List mapanomes=new Gson（）.fromJson(
读者，
新的TypeToken（）{}.getType（））；
然后你可以对他们中的每一个人做任何你想做的事
用于（MapaNomes MapaNomes:MapaNomes）{
//随便
}

为什么要将

映射

转换为与json无关的

BufferedReader

首先将json响应转换为DataObject，然后映射它。这里的

br

是

BufferedReader

对象

JsonReader reader = new JsonReader(new FileReader("file.json"));
MapaNomes mapaNomes = new Gson().fromJson(reader, MapaNomes.class);

{
    "id":1,
    "name":"Gold",
    "description":"Shiny!",
    "spriteId":1,
    "consumable":true,
    "effectsId":[1]
},
...
{
    "id":999,
    "name":"Silver",
    "description":"Whatever!",
    "spriteId":808,
    "consumable":true,
    "effectsId":[2]
},

JsonReader reader = new JsonReader(new FileReader("file.json"));
List<MapaNomes> mapaNomeses = new Gson().fromJson(
                                reader, 
                                new TypeToken<List<Review>>() {}.getType());

Then you can do whatever you want with each and every one of them

for (MapaNomes mapaNomes : mapaNomeses) {
    // whatever
}