If there are duplicate keys in the JSON, the current JSON parser will take the value corresponding to the first occurrence of the key:
inputString:
public class SimdJsonTest {
static final SimdJsonParser SIMD_PARSER = new SimdJsonParser();
static final ObjectMapper JACKSON = new ObjectMapper();
static final Gson GSON = new GsonBuilder().create();
public static void main(String[] args) throws IOException {
String json = "{\"num\": 2, \"num\": 123}";
byte[] bytes = json.getBytes();
JsonValue value = SIMD_PARSER.parse(bytes, bytes.length);
System.err.println("[simd].size = " + value.getSize()); // 2
System.err.println("[simd].num = " + value.get("num")); // 2
Map jcsObj = JACKSON.readValue(bytes, Map.class);
System.err.println("[jackson].size = " + jcsObj.size()); // 1
System.err.println("[jackson].num = " + jcsObj.get("num")); // 123
// will throw exception: com.google.gson.JsonSyntaxException: duplicate key: num
Map gsonObj = GSON.fromJson(new String(bytes), Map.class);
System.err.println("[gson].size = " + gsonObj.size());
System.err.println("[gson].num = " + gsonObj.get("num"));
}
}
The content of the console output：
[simd].size = 2
[simd].num = 2
[jackson].size = 1
[jackson].num = 123
Exception in thread "main" com.google.gson.JsonSyntaxException: duplicate key: num
...
If there are duplicate keys in the JSON, the current JSON parser will take the value corresponding to the first occurrence of the key:
inputString:
The content of the console output：