（我对Gson和Json很新，所以请原谅我这是一个愚蠢的问题）
以下是我POST请求中的String getResponse = ({"user_id":"1","device_id":"0","user_name":"jdoe","first_name":"John","last_name":"Doe"});
：
response获取JSON后，我使用以下方法将Java值放入 FacebookUser facebookUser = new FacebookUser();
JSONObject responseObject = new JSONObject(getResponse);
Iterator<String> iter = responseObject.keys();
while (iter.hasNext()) {
String key = iter.next();
switch (key) {
case "user_id":
try {
Object value = responseObject.get(key);
facebookUser.setUserId((String) value);
} catch (JSONException e) {
Log.d("JsonException", "error" + e.toString());
}
break;
case "device_id":
try {
Object value = responseObject.get(key);
facebookUser.setDeviceId((String) value);
} catch (JSONException e) {
Log.d("JsonException", "error" + e.toString());
}
break;
case "user_name":
try {
Object value = responseObject.get(key);
facebookUser.setUsername((String) value);
} catch (JSONException e) {
Log.d("JsonException", "error" + e.toString());
}
break;
case "first_name":
try {
Object value = responseObject.get(key);
facebookUser.setFirstName((String) value);
} catch (JSONException e) {
Log.d("JsonException", "error" + e.toString());
}
break;
case "last_name":
try {
Object value = responseObject.get(key);
facebookUser.setLastName((String) value);
} catch (JSONException e) {
Log.d("JsonException", "error" + e.toString());
}
break;
}
}
对象中：
FacebookUser这很有效，所有值都放在我的response对象中。但显然这是非常繁琐的工作，特别是在我得到一个具有100个键/值对的Gson的情况下。
所以我尝试使用 String getResponse = ({"user_id":"1","device_id":"0","user_name":"jdoe","first_name":"John","last_name":"Doe"});
FacebookUser facebookUser = new FacebookUser();
Gson gson = new GsonBuilder()
.disableHtmlEscaping()
.setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE)
.setPrettyPrinting()
.serializeNulls()
.create();
FacebookUser facebookUser = gson.fromJson(getResponse,
FacebookUser.class);
一次完成这项工作：
facebookUser但是，所有public class FacebookUser implements Serializable{
String userId;
String deviceId;
String username;
String firstName;
String lastName;
public FacebookUser() { //default ctor
}
... a bunch of getters
... a bunch of setters
}
字段都为空...
有人可以帮忙吗？
这是我的FacebookUser类：
<sessionState mode="Off|InProc|StateServer|SQLServer"
cookieless="true|false"
timeout="number of minutes"
stateConnectionString="tcpip=server:port"
sqlConnectionString="sql connection string"
stateNetworkTimeout="number of seconds"/>
答案 0 :(得分：1)
您需要匹配确切的名称，您可以使用SerializedName注释
@SerializedName("user_id") String userId;
答案 1 :(得分：0)
Gson不知道找到与json字段匹配的属性因为下划线，你必须解释如何使用_
`
final GsonBuilder builder = new GsonBuilder();
builder.setDateFormat(DateFormat.LONG);
builder.setPrettyPrinting();
builder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
final Gson gson = builder.create();
FacebookUser facebookUser = gson.fromJson(getResponse,FacebookUser.class);
`
有了这个gson，这应该有效