Gson反序列化无法处理时间戳的问题

Gson gson = new Gson();
String jsonStr = "json字符串，省略。。";
Person person = gson.fromJson(jsonStr, Person.class);

com.google.gson.JsonSyntaxException: /Date(1552348800000)/

	at com.google.gson.internal.bind.DateTypeAdapter.deserializeToDate(DateTypeAdapter.java:87)
	at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:75)
	at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:46)
	....
    ....
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.text.ParseException: Failed to parse date ["/Date(1552348800000)/"]: Invalid number: /Dat
	at com.google.gson.internal.bind.util.ISO8601Utils.parse(ISO8601Utils.java:274)
	at com.google.gson.internal.bind.DateTypeAdapter.deserializeToDate(DateTypeAdapter.java:85)
	... 31 more
Caused by: java.lang.NumberFormatException: Invalid number: /Dat

//创建GsonBuilder 管理收到的信息
GsonBuilder builder = new GsonBuilder();
//注册适配器以将日期类型作为长值进行管理
builder.registerTypeAdapter(Date.class, new JsonDeserializer<Date>() {
    @Override
    public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        String dateStr = json.getAsJsonPrimitive().getAsString();
        long timestamp = Long.parseLong(dateStr.substring(6, dateStr.length() - 2));
        Date d = new Date(timestamp);
        return d;
    }
});
Gson gson = builder.create();
String jsonStr = "json字符串，省略。。";
Person person = gson.fromJson(jsonStr, Person.class);