我想使用我使用 HttpUrlConnection 构建的客户端应用程序来读取 REST 服务的 GET 方法的结果。该方法返回有关用户的信息。阅读后,我想创建一个User 类型的对象,并填充该 User 的所有信息。我想我必须先将其转换为 JSON,对吧?我正在使用 GSON。
我所拥有的是:
if(urlConnection.getResponseCode()==200)
{
String response ="";
Scanner inStream = new Scanner(urlConnection.getInputStream());
while(inStream.hasNextLine())
response+=(inStream.nextLine());
System.out.println(response);
//JSON
Gson gson = new Gson();
String json = gson.toJson(response);
System.out.println(json);
// User Object
User object = new User();
object = gson.fromJson(json, User.class);
System.out.println(object);
}
当我进行第一次打印时,我收到:
{"userID":"user2","isMale":false,"isObject":false,"telephone":"+911111111","email":"maug@abc.pt","birthdate":"2012-08-01","firstName":"Maria","lastName":"Silva","isocountrycode":"PT"}
当我进行第二次打印时,我收到:
"{\"userID\":\"user2\",\"isMale\":false,\"isObject\":false,\"telephone\":\"+911111111\",\"email\":\"maug@abc.pt\",\"birthdate\":\"2012-08-01\",\"firstName\":\"Maria\",\"lastName\":\"Silva\",\"isocountrycode\":\"PT\"}"
但是当我尝试打印用户对象时,我收到了这个错误:
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 226
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:176)
at com.google.gson.Gson.fromJson(Gson.java:795)
at com.google.gson.Gson.fromJson(Gson.java:761)
at com.google.gson.Gson.fromJson(Gson.java:710)
at com.google.gson.Gson.fromJson(Gson.java:682)
at httpURLconnection.UserGetUserInfo.main(UserGetUserInfo.java:70)
Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 226
at com.google.gson.stream.JsonReader.expect(JsonReader.java:339)
at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:322)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:165)
... 5 more
你能告诉我我做错了什么吗?所有用户对象字段都是使用该用户类填充的。
用户等级:
public class User {
String userID = null;
boolean isMale = false;
boolean isObject = false;
String Telephone = null;
String Email = null;
Date Birthdate = null;
String FirstName = null;
String LastName = null;
String ISOcountrycode = null;
(...)
}