我之前已经讨论过这个话题，但我没有看到任何有我特色的人。标题描述了我的情况。两件事，我已经通过（我想想）这里所有可能的答案，这就是我写自己的问题的原因。第二件事，反序列化在另一个项目中完美无缺，并且我按原样复制（也许这就是问题所在）。我还检查了https://sites.google.com/site/gson/gson-user-guide#TOC-Writing-a-Deserializer但我无法找到我的代码有什么问题。所以这是我到目前为止： JSON：
{"offset":0,
"total":137,
"per-page":20,
"events":[
{"id":286560,
"name":"Arsenal vs Everton",
"start":"2015-03-01T14:10:00.000Z",
"status":"open",
"sport-id":15,
"category-id":[158208],
"in-running-flag":true,
"allow-live-betting":true,
"market-ids":[1119280,1121697,1121698,1119271,1119299,1119587,1119288,1118302,1120869,1120870,1121696,1121900,1120868],
"meta-tags":[
{"id":402,
"name":"Live Betting",
"type":"COMPETITION"
},
{"id":19,
"name":"England",
"type":"COUNTRY"
},
{"id":32,
"name":"Premier League",
"type":"COMPETITION"
},
{"id":2285,
"name":"March 1st 2015",
"type":"DATE"
},
{"id":1,
"name":"Sport",
"type":"Root"
},
{"id":4,
"name":"Soccer",
"type":"SPORT"
}]
},
{"id":286960,
"name":"Norwich vs Ipswich Town",
"start":"2015-03-01T14:10:00.000Z",
"status":"open",
"sport-id":15,
"category-id":[158307],
"in-running-flag":true,
"allow-live-betting":true,
"market-ids":[1121701,1121702,1122048,1120062,1120099,1121700,1120050,1120111,1120087,1121620],
"meta-tags":[
{"id":402,
"name":"Live Betting",
"type":"COMPETITION"
},
{"id":33,
"name":"Championship",
"type":"COMPETITION"
},
{"id":19,
"name":"England",
"type":"COUNTRY"
},
{"id":2285,
"name":"March 1st 2015",
"type":"DATE"
},
{"id":1,
"name":"Sport",
"type":"Root"
},
{"id":4,
"name":"Soccer",
"type":"SPORT"}]}
]}
班级：
public class Event {
private String id;
private String name;
private Date start;
private String status;
private String sportId;
private ArrayList<String> categoryId;
private boolean inRunningFlag;
private boolean allowLiveBetting;
private ArrayList<String> marketIds;
private List<MetaTags> metaTags;
public String getId(){
return id;
}
public String getName(){
return name;
}
public Date getStartDate(){
return start;
}
public String getStatus(){
return status;
}
public String getSportId(){
return sportId;
}
public ArrayList<String> getCategoryId(){
return categoryId;
}
public boolean getInRunningFlag(){
return inRunningFlag;
}
public boolean getAllowLiveBetting(){
return allowLiveBetting;
}
public ArrayList<String> getMarketIds(){
return marketIds;
}
public List<MetaTags> getMetaTags(){
return metaTags;
}
public void setId(String id){
this.id = id;
}
public void setName(String name){
this.name = name;
}
public void setStartDate(Date start){
this.start = start;
}
public void setStatus(String status){
this.status = status;
}
public void setSportId(String sportId){
this.sportId = sportId;
}
public void setCategoryId(ArrayList<String> categoryId){
this.categoryId = categoryId;
}
public void setInRunningFlag(boolean inRunningFlag){
this.inRunningFlag = inRunningFlag;
}
public void setAllowLiveBetting(boolean allowLiveBetting){
this.allowLiveBetting = allowLiveBetting;
}
public void setMarketIds(ArrayList<String> marketIds){
this.marketIds = marketIds;
}
public void setMetaTags(List<MetaTags> metaTags){
this.metaTags = metaTags;
}}
和
public class EventContainer extends Container{
private List<Event> result;
public List<Event> getResult(){
return result;
}
public void setResult(List<Event> result){
this.result = result;
}}
最后是从json转换为对象的过程
public List<Event> listEvents (String sessionToken) throws APIException{
String result = getInstance().makeRequest(MatchBookApiCalls.LISTEVENTS.getApiCallName(), MatchBookApiCalls.LISTEVENTS.getURLSuffix(), sessionToken);
EventContainer container = JsonConverter.convertFromJson(result, EventContainer.class);
if(container.getError() != null)
throw container.getError().getData().getAPIException();
return container.getResult();
}
和最后一个：
public class JsonConverter {
/**
* We needed to override the adapter for the Date class so to make all dates to be serialized in ISO8601 UTC
* Just formatting the string to the ISO format does not adjust by the timezone on the Date instance during serialization.
*/
private static final Gson gson = new GsonBuilder().registerTypeAdapter(Date.class, new ISO8601DateTypeAdapter()).create();
/** This method deserializes the specified Json into an object of the specified class.
*
*/
public static <T> T convertFromJson(String toConvert, Class<T> clazz){
return gson.fromJson(toConvert, clazz); // this is failing horribly
}
/** This method deserializes the specified Json into an object of the specified Type.
*
*/
public static <T> T convertFromJson(String toConvert, Type typeOfT){
return gson.fromJson(toConvert, typeOfT);
}
/**
* This method serializes the specified object into its equivalent Json representation.
*/
public static String convertToJson(Object toConvert){
return gson.toJson(toConvert);
}}
我已经和它斗争了两天，所以也许我的大脑有点烧焦，答案是如此愚蠢我会把头撞在墙上，但我无法看到它。哦！错误是：
Exception in thread "main" java.lang.NullPointerException
at MatchBookApiJsonOperations.listEvents(MatchBookApiJsonOperations.java:46)
at MatchBookPlaceBet.getEvents(MatchBookPlaceBet.java:27)
at MatchBookConnection.testingEntities(MatchBookConnection.java:160)
at MatchBookMain.main(MatchBookMain.java:36)
提前感谢任何帮助
容器：
public class Container {
private Error error;
private String json;
public Error getError(){
return error;
}
public String getJson(){
return json;
}
public void setError(Error error){
this.error = error;
}
public void setJson(String json){
this.json = json;
}
}
答案 0 :(得分：0)