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私は、サーバーからデータを取得するのにvolley + OkHttpを使用しています。GSON/POJOでJSONを解析する
レスポンスは、GSON/POJOを使用して解析するJSONを含む文字列です。
Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $
解析しよう：
私はエラーを取得します。
Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $
at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:388)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:209)
at com.google.gson.Gson.fromJson(Gson.java:879)
at com.google.gson.Gson.fromJson(Gson.java:844)
at com.google.gson.Gson.fromJson(Gson.java:793)
at com.google.gson.Gson.fromJson(Gson.java:765)
at test.com.example.buddy.myapplication.MainActivity$8.onResponse(MainActivity.java:192) //
ライン192は、私が期待どおりに動作しますJSON_STRINGの下に使用一方Post component = gson.fromJson(response, Post.class);
であり、私はPOJOクラスを使用して値を取得します。
String JSON_STRING = "{\"currentBalance\":{\"amount\":0.0,\"currencyCode\":\"EUR\"},\"currentBalanceDisplay\":true,\"overdueAmount\":null,\"overdueAmountDisplay\":false," +
"\"creditAmount\":null,\"creditAmountDisplay\":false,\"noOfBillsToShow\":3,\"recentBills\":[{\"period\":\"03 2016\",\"amount\":{\"amount\":22.76," +
"\"currencyCode\":\"EUR\"},\"status\":\"PAID\",\"dueDate\":\"14-03-2016\",\"sortOrder\":\"20160308\",\"periodType\":\"MONTHLY\"," +
"\"invoiceId\":\"277726719\",\"invoiceDate\":\"08-03-2016\"}]}";
誰かが助けてくれたら嬉しいです。前もって感謝します。
EDIT：予想通り私は完全な馬鹿のように感じる:)それは私が間違ったURLを照会して判明、すべてが動作します。私を助けてくれてありがとう、もう一度ありがとう。サーバーから
文字列の応答：
{
"currentBalance": {
"amount": 0.0,
"currencyCode": "EUR"
},
"currentBalanceDisplay": true,
"overdueAmount": null,
"overdueAmountDisplay": false,
"creditAmount": null,
"creditAmountDisplay": false,
"noOfBillsToShow": 3,
"recentBills": [
{
"period": "03 2016",
"amount": {
"amount": 12.53,
"currencyCode": "EUR"
},
"status": "PAID",
"dueDate": "14-03-2016",
"sortOrder": "2548264",
"periodType": "MONTHLY",
"invoiceId": "",
"invoiceDate": "08-03-2016"
}
]
}
ボレー要求：
private void FetchData() {
StringRequest finalrequest = new StringRequest(Request.Method.POST, FETCHURL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Gson gson = new Gson();
Post component = gson.fromJson(response, Post.class);
System.out.println("JSON " + component.getRecentBills().get(0).getInvoiceDate());
// Output: JSON 08-03-2016 (success!)
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.d("ERROR", "error finalrequest => " + error.toString());
}
}
) {
@Override
public String getBodyContentType() {
return "application/x-www-form-urlencoded; charset=utf-8";
}
// this is the relevant method
@Override
public byte[] getBody() {
String httpPostBody = "action=GET_CUST_BILLS&" + "user=" + CustID;
try {
httpPostBody = httpPostBody + URLEncoder.encode("", "UTF-8");
} catch (UnsupportedEncodingException exception) {
Log.e("ERROR", "exception", exception);
// return null and don't pass any POST string if you encounter encoding error
return null;
}
Log.d("POSTBODY ", httpPostBody.toString());
return httpPostBody.getBytes();
}
};
finalrequest.setRetryPolicy(new DefaultRetryPolicy(DefaultRetryPolicy.DEFAULT_TIMEOUT_MS * 5,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
TestController.getInstance().addToRequestQueue(finalrequest, "Final");
}
POJO Postクラス：
public class Post {
private CurrentBalanceBean currentBalance;
private boolean currentBalanceDisplay;
private Object overdueAmount;
private boolean overdueAmountDisplay;
private Object creditAmount;
private boolean creditAmountDisplay;
private int noOfBillsToShow;
private List<RecentBillsBean> recentBills;
public static Post objectFromData(String str) {
return new Gson().fromJson(str, Post.class);
}
public static Post objectFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
return new Gson().fromJson(jsonObject.getString(str), Post.class);
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
public static List<Post> arrayPostFromData(String str) {
Type listType = new TypeToken<ArrayList<Post>>() {
}.getType();
return new Gson().fromJson(str, listType);
}
public static List<Post> arrayPostFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
Type listType = new TypeToken<ArrayList<Post>>() {
}.getType();
return new Gson().fromJson(jsonObject.getString(str), listType);
} catch (JSONException e) {
e.printStackTrace();
}
return new ArrayList();
}
public CurrentBalanceBean getCurrentBalance() {
return currentBalance;
}
public void setCurrentBalance(CurrentBalanceBean currentBalance) {
this.currentBalance = currentBalance;
}
public boolean isCurrentBalanceDisplay() {
return currentBalanceDisplay;
}
public void setCurrentBalanceDisplay(boolean currentBalanceDisplay) {
this.currentBalanceDisplay = currentBalanceDisplay;
}
public Object getOverdueAmount() {
return overdueAmount;
}
public void setOverdueAmount(Object overdueAmount) {
this.overdueAmount = overdueAmount;
}
public boolean isOverdueAmountDisplay() {
return overdueAmountDisplay;
}
public void setOverdueAmountDisplay(boolean overdueAmountDisplay) {
this.overdueAmountDisplay = overdueAmountDisplay;
}
public Object getCreditAmount() {
return creditAmount;
}
public void setCreditAmount(Object creditAmount) {
this.creditAmount = creditAmount;
}
public boolean isCreditAmountDisplay() {
return creditAmountDisplay;
}
public void setCreditAmountDisplay(boolean creditAmountDisplay) {
this.creditAmountDisplay = creditAmountDisplay;
}
public int getNoOfBillsToShow() {
return noOfBillsToShow;
}
public void setNoOfBillsToShow(int noOfBillsToShow) {
this.noOfBillsToShow = noOfBillsToShow;
}
public List<RecentBillsBean> getRecentBills() {
return recentBills;
}
public void setRecentBills(List<RecentBillsBean> recentBills) {
this.recentBills = recentBills;
}
public static class CurrentBalanceBean {
private int amount;
private String currencyCode;
public static CurrentBalanceBean objectFromData(String str) {
return new Gson().fromJson(str, CurrentBalanceBean.class);
}
public static CurrentBalanceBean objectFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
return new Gson().fromJson(jsonObject.getString(str), CurrentBalanceBean.class);
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
public static List<CurrentBalanceBean> arrayCurrentBalanceBeanFromData(String str) {
Type listType = new TypeToken<ArrayList<CurrentBalanceBean>>() {
}.getType();
return new Gson().fromJson(str, listType);
}
public static List<CurrentBalanceBean> arrayCurrentBalanceBeanFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
Type listType = new TypeToken<ArrayList<CurrentBalanceBean>>() {
}.getType();
return new Gson().fromJson(jsonObject.getString(str), listType);
} catch (JSONException e) {
e.printStackTrace();
}
return new ArrayList();
}
public int getAmount() {
return amount;
}
public void setAmount(int amount) {
this.amount = amount;
}
public String getCurrencyCode() {
return currencyCode;
}
public void setCurrencyCode(String currencyCode) {
this.currencyCode = currencyCode;
}
}
public static class RecentBillsBean {
private String period;
/**
* amount : 22.76
* currencyCode : EUR
*/
private AmountBean amount;
private String status;
private String dueDate;
private String sortOrder;
private String periodType;
private String invoiceId;
private String invoiceDate;
public static RecentBillsBean objectFromData(String str) {
return new Gson().fromJson(str, RecentBillsBean.class);
}
public static RecentBillsBean objectFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
return new Gson().fromJson(jsonObject.getString(str), RecentBillsBean.class);
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
public static List<RecentBillsBean> arrayRecentBillsBeanFromData(String str) {
Type listType = new TypeToken<ArrayList<RecentBillsBean>>() {
}.getType();
return new Gson().fromJson(str, listType);
}
public static List<RecentBillsBean> arrayRecentBillsBeanFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
Type listType = new TypeToken<ArrayList<RecentBillsBean>>() {
}.getType();
return new Gson().fromJson(jsonObject.getString(str), listType);
} catch (JSONException e) {
e.printStackTrace();
}
return new ArrayList();
}
public String getPeriod() {
return period;
}
public void setPeriod(String period) {
this.period = period;
}
public AmountBean getAmount() {
return amount;
}
public void setAmount(AmountBean amount) {
this.amount = amount;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getDueDate() {
return dueDate;
}
public void setDueDate(String dueDate) {
this.dueDate = dueDate;
}
public String getSortOrder() {
return sortOrder;
}
public void setSortOrder(String sortOrder) {
this.sortOrder = sortOrder;
}
public String getPeriodType() {
return periodType;
}
public void setPeriodType(String periodType) {
this.periodType = periodType;
}
public String getInvoiceId() {
return invoiceId;
}
public void setInvoiceId(String invoiceId) {
this.invoiceId = invoiceId;
}
public String getInvoiceDate() {
return invoiceDate;
}
public void setInvoiceDate(String invoiceDate) {
this.invoiceDate = invoiceDate;
}
public static class AmountBean {
private double amount;
private String currencyCode;
public static AmountBean objectFromData(String str) {
return new Gson().fromJson(str, AmountBean.class);
}
public static AmountBean objectFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
return new Gson().fromJson(jsonObject.getString(str), AmountBean.class);
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
public static List<AmountBean> arrayAmountBeanFromData(String str) {
Type listType = new TypeToken<ArrayList<AmountBean>>() {
}.getType();
return new Gson().fromJson(str, listType);
}
public static List<AmountBean> arrayAmountBeanFromData(String str, String key) {
try {
JSONObject jsonObject = new JSONObject(str);
Type listType = new TypeToken<ArrayList<AmountBean>>() {
}.getType();
return new Gson().fromJson(jsonObject.getString(str), listType);
} catch (JSONException e) {
e.printStackTrace();
}
return new ArrayList();
}
public double getAmount() {
return amount;
}
public void setAmount(double amount) {
this.amount = amount;
}
public String getCurrencyCode() {
return currencyCode;
}
public void setCurrencyCode(String currencyCode) {
this.currencyCode = currencyCode;
}
}
}
}
ボレーにはJsonRequestというクラスがありますが、それはあなたがJsonに直接アクセスできるようにすべてのことを行うためです。 – Jois
@Jois、レスポンスのためのthxですが、すでに同じエラーが発生しました。 – Simon
Log.v（ "json response"、レスポンス）でレスポンスを記録しようとしました。 Gsonの前にgson =新しいGson（）;投稿コンポーネント= gson.fromJson（response、Post.class）;実際のサーバーの応答が期待した応答と同じかどうかを確認してください。 – HendraWD