gson parse items from comma-separated-value string within a json value

问题

I am parsing a json string using gson. It is similar to this:

{
    "ACode": "aa",
    "RCode": "rr",
    "Errors": "e1,e2,e3"
}

I think that the errors should have been a proper json array, but I don't have control of that.

I want to get the errors into an array or collection in java. This is easy enough using String.split with comma as separator. However I am new to gson and I don't know if I would be ignoring functionality that it provides to parse a comma separated string.

Does anyone know whether gson can handle this automatically?

回答1:

I want to get the errors into an array or collection in java.

Try this one

String json = "{\"ACode\": \"aa\",\"RCode\": \"rr\", \"Errors\": \"e1,e2,e3\" }";

class ErrorsDeserializer implements JsonDeserializer<String[]> {

    public String[] deserialize(JsonElement json, Type typeOfT,
            JsonDeserializationContext context) throws JsonParseException {
        return ((JsonObject) json).getAsJsonPrimitive("Errors").getAsString().split(",");
    }
}

Gson gson1 = new GsonBuilder().registerTypeAdapter(String[].class, new ErrorsDeserializer())
        .create();

String[] errors = gson1.fromJson(json, String[].class);
for (String error : errors) {
    System.out.println(error);
}

回答2:

you can create a class with variables "ACode","RCode","Errors" then use gson to convert it to that class, CustomObject obj2 = gson.fromJson(json, CustomObject .class);

来源：https://stackoverflow.com/questions/23071765/gson-parse-items-from-comma-separated-value-string-within-a-json-value

标签

java

json

csv

gson