将 json 字符串转换为对象数组

Question

我有 json 数组作为字符串

[
        {
        "id":"1",   
            "lat": "23.053",
            "long": "72.629",
            "location": "ABC",
            "address": "DEF",
            "city": "Ahmedabad",
            "state": "Gujrat",
            "phonenumber": "1234567"
        },
        {
        "id":"2",   
            "lat": "23.053",
            "long": "72.629",
            "location": "ABC",
            "address": "DEF",
            "city": "Ahmedabad",
            "state": "Gujrat",
            "phonenumber": "1234567"
        },
        {
            "id":"3",   
        "lat": "23.053",
            "long": "72.629",
            "location": "ABC",
            "address": "DEF",
            "city": "Ahmedabad",
            "state": "Gujrat",
            "phonenumber": "1234567"
        },
        {
            "id":"4",   
        "lat": "23.053",
            "long": "72.629",
            "location": "ABC",
            "address": "DEF",
            "city": "Ahmedabad",
            "state": "Gujrat",
            "phonenumber": "1234567"
        },
        {
            "id":"5",   
        "lat": "23.053",
            "long": "72.629",
            "location": "ABC",
            "address": "DEF",
            "city": "Ahmedabad",
            "state": "Gujrat",
            "phonenumber": "1234567"
        }
]

我想将此字符串转换为每个 json object。 我有一个 class 地址。 我如何将此 json 字符串转换为 object

我试过了

Address address = gson.fromJson(addressJson, Address.class);

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2
    com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:176)
    com.google.gson.Gson.fromJson(Gson.java:803)
    com.google.gson.Gson.fromJson(Gson.java:768)
    com.google.gson.Gson.fromJson(Gson.java:717)
    com.google.gson.Gson.fromJson(Gson.java:689)

Answer 1

尝试这个

Address[] address = gson.fromJson(addressJson, Address[].class);

Answer 2

使用Jackson's ObjectMapper class，您可以将值和 map 读取到 object 或对象数组。

final ObjectMapper objectMapper = new ObjectMapper();
Address [] mdls = objectMapper.readValue(addressJson, Address [].class);

对于List<Address>使用：

List<Address> mdls = objectMapper.readValue(addressJson, new TypeReference<List<Address>>() {});