JSON数据反序列化
[英]JSON data deserialization
问题描述
I get this JSON data from front-end: 
我从前端获得此JSON数据：
user {"idUser":5,"fullname":"Bob Marley", "birthday":"1990-12-14", "login":"b.marley", "password":"none","dateCreate":"2014-10-09 15:01","grp":{"idGrp":"2","nameGrp":"client"}}
I want to do deserialization these data in java: 我想在Java中反序列化这些数据：
User.java User.java
public class User implements Serializable {
private static final long serialVersionUID = 1L;
private int idUser;
private String fullname;
private Date birthday;
private String login;
private String password;
private Date dateCreate;
private Grp grp;
//getters and setters
UserDeserializer.java UserDeserializer.java
public class UserDeserializer implements JsonDeserializer<User> {
@Override
public User deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
JsonObject jObject = json.getAsJsonObject();
User user = new User();
user.setIdUser(jObject.get("idUser").getAsInt());
user.setFullname(jObject.get("fullname").getAsString());
try {
Date birthday = new SimpleDateFormat("yyyy-MM-dd").parse(jObject.get("birthday").getAsString());
user.setBirthday(birthday);
} catch (ParseException e) {
}
user.setLogin(jObject.get("login").getAsString());
user.setPassword(jObject.get("password").getAsString());
try {
Date dateCreate = new SimpleDateFormat("yyyy-MM-dd HH:mm").parse(jObject.get("dateCreate").getAsString());
user.setDateCreate(dateCreate);
} catch (ParseException e) {
}
Grp grp = context.deserialize(jObject.get("grp"), Grp.class);
user.setGrp(grp);
return user;
}
}
UserEdit.java UserEdit.java
public class UserEdit extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.registerTypeAdapter(User.class, new UserDeserializer());
Gson gson = new GsonBuilder().create();
User user = gson.fromJson(request.getParameter("user"), User.class);
And I get this error at the last row of the UserEdit.java: 我在UserEdit.java的最后一行收到此错误：
04-Nov-2014 21:30:44.003 SEVERE [http-apr-8080-exec-1] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [Servlet UserEdit] in context with path [] threw exception com.google.gson.JsonSyntaxException: 1990-12-14 at com.google.gson.internal.bind.DateTypeAdapter.deserializeToDate(DateTypeAdapter.java:81) at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:66) at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:41) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:95) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:183) at com.google.gson.Gson.fromJson(Gson.java:805) at com.google.gson.Gson.fromJson(Gson.java:770) at com.google.gson.Gson.fromJson(Gson.java:719) at com.google.gson.Gson.fromJson(Gson.java:691) at com.gmail.zigfridus.UserEdit.doGet(UserEdit.java:24) at javax.servlet.http.HttpServlet.se
It says that error is because of birthday date, but that date looks like normal. 它说该错误是由于生日，但该日期看起来很正常。
Please, help me. 请帮我。
4 个解决方案
解决方案1
2 已采纳 2014-11-04 20:20:22
Here : 这里 ：
GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.registerTypeAdapter(User.class, new UserDeserializer());
Gson gson = new GsonBuilder().create();
You are creating a new GsonBuilder , effectively dismissing the one you just configured. 您正在创建一个新的GsonBuilder ，实际上是关闭了刚刚配置的GsonBuilder 。 Use 采用
GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.registerTypeAdapter(User.class, new UserDeserializer());
Gson gson = gsonBuilder.create();
to use the gsonBuilder configured with the user deserializer. 使用配置了用户解串器的gsonBuilder。
解决方案2
1 2014-11-04 19:59:58
Use yyyy-MM-dd HH:mm:ss as your simple date format. 使用yyyy-MM-dd HH:mm:ss作为简单的日期格式。 I know you don't have hours, minutes and seconds, but I don't believe that it accepts it without them. 我知道您没有小时，分钟和秒，但是我不相信没有它们，它不会接受。
解决方案3
1 2014-11-04 20:15:24
You will need to add values for hh:mm:ss in order to instantiate an acceptable date format. 您将需要为hh：mm：ss添加值，以实例化可接受的日期格式。 You obviously aren't concerned with the time and in this case I would suggest simply using 00:00:00. 您显然与时间无关，在这种情况下，我建议您仅使用00:00:00。
解决方案4
1 2014-11-04 20:16:15
错误似乎是在API内部绑定中使用DateTypeAdapter ...我对该库不熟悉，但是也许您的UserDeserializer没有在API /框架中正确配置，并且使用了默认值（并且生日是bean中的Date到反序列化）
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