使用GSON庫的JSON：錯誤期望的BEGIN_OBJECT但是STRING

我想用json解析一個json字符串回到Java對象。不過，我不斷收到上述錯誤：使用GSON庫的JSON：錯誤期望的BEGIN_OBJECT但是STRING

Expected BEGIN_OBJECT but was STRING.

我看到有一些故有此錯誤的問題，但他們都不似乎適用於我的情況。

我的Java代碼如下：

其中paymentJson是付款對象，我得到了一個HTTP POST的JSON字符串。

使用，以測試它以JSON字符串IM是以下幾點：

{ 
"creationDate": "2013-04-10T09:59:45.890+02:00", 
"beneficiary": "Heat Hot Sauces", 
"amount": 31.54, 
"ibanSender": "CH190020600000DEMO303", 
"paymentType": "ACCOUNT_TO_ACCOUNT", 
"executionDate": "2013-04-10", 
"fees": 0, 
"ibanReceiver": "CH730020600000DEMO301", 
"status": { 
    "code": "PENDING" 
}, 
"currency": "CHF", 
"description": "Sudden Death Sauce", 
"id": "25202", 
"total": 31.54

}

我查與JsonLint，其有效的JSON的JSON的有效性。

我知道通過http向我發送json數據的另一端也使用GSON和相同的類「Payment」，但我不能/允許在那裏更改代碼。

支付類看起來是這樣的：

public class Payment { 

    private String id; 
    private PaymentType paymentType; 
    private PaymentCategory paymentCategory; 
    private String ibanSender; 
    private LocalDate executionDate; 
    private DateTime creationDate; 
    private String currency; 
    private Double amount; 
    private Double fees; 
    private PaymentStatus status; 
    private String description; 
    private Double total; 

    // attributes which identifiers the beneficiary of the payment 
    private String ibanReceiver; 
    private String accountNumber; 
    private String swift; 
    private String referenceNumber; 
    private PaymentFeesChargingCode feesCharging; 
    private String beneficiary; 

    // the following 5 beneficiary fields can be used for address (beneficiary_5 
    // should be used for country) 
    private String beneficiary_1; 
    private String beneficiary_2; 
    private String beneficiary_3; 
    private String beneficiary_4; 
    private String beneficiary_5; // country 
    // the reference to the StandingOrder which created this payment, or null 
    private String standingOrderId; 

    public Payment() { 
    super(); 
    } 
    public String getId() { 
    return id; 
    } 
    public void setId(String id) { 
    this.id = id; 
    } 
    public PaymentType getPaymentType() { 
    return paymentType; 
    } 
    public void setPaymentType(PaymentType paymentType) { 
    this.paymentType = paymentType; 
    } 
    public String getIbanSender() { 
    return ibanSender; 
    } 
    public void setIbanSender(String ibanSender) { 
    this.ibanSender = ibanSender; 
    } 
    public LocalDate getExecutionDate() { 
    return executionDate; 
    } 
    public void setExecutionDate(LocalDate executionDate) { 
    this.executionDate = executionDate; 
    } 
    public DateTime getCreationDate() { 
    return creationDate; 
    } 
    public void setCreationDate(DateTime creationDate) { 
    this.creationDate = creationDate; 
    } 
    public String getCurrency() { 
    return currency; 
    } 
    public void setCurrency(String currency) { 
    this.currency = currency; 
    } 
    public Double getAmount() { 
    return amount; 
    } 
    public void setAmount(Double amount) { 
    this.amount = amount; 
    } 
    public Double getFees() { 
    return fees; 
    } 
    public void setFees(Double fees) { 
    this.fees = fees; 
    } 
    public PaymentStatus getStatus() { 
    return status; 
    } 
    public void setStatus(PaymentStatus status) { 
    this.status = status; 
    } 
    public String getDescription() { 
    return description; 
    } 
    public void setDescription(String description) { 
    this.description = description; 
    } 
    public Double getTotal() { 
    return total; 
    } 
    public void setTotal(Double total) { 
    this.total = total; 
    } 
    public String getIbanReceiver() { 
    return ibanReceiver; 
    } 
    public void setIbanReceiver(String ibanReceiver) { 
    this.ibanReceiver = ibanReceiver; 
    } 
    public String getAccountNumber() { 
    return accountNumber; 
    } 
    public void setAccountNumber(String accountNumber) { 
    this.accountNumber = accountNumber; 
    } 
    public String getSwift() { 
    return swift; 
    } 
    public void setSwift(String swift) { 
    this.swift = swift; 
    } 
    public String getReferenceNumber() { 
    return referenceNumber; 
    } 
    public void setReferenceNumber(String referenceNumber) { 
    this.referenceNumber = referenceNumber; 
    } 
    public PaymentFeesChargingCode getFeesCharging() { 
    return feesCharging; 
    } 
    public void setFeesCharging(PaymentFeesChargingCode feesCharging) { 
    this.feesCharging = feesCharging; 
    } 
    public String getBeneficiary() { 
    return beneficiary; 
    } 
    public void setBeneficiary(String beneficiary) { 
    this.beneficiary = beneficiary; 
    } 
    public String getBeneficiary_1() { 
    return beneficiary_1; 
    } 
    public void setBeneficiary_1(String beneficiary_1) { 
    this.beneficiary_1 = beneficiary_1; 
    } 
    public String getBeneficiary_2() { 
    return beneficiary_2; 
    } 
    public void setBeneficiary_2(String beneficiary_2) { 
    this.beneficiary_2 = beneficiary_2; 
    } 
    public String getBeneficiary_3() { 
    return beneficiary_3; 
    } 
    public void setBeneficiary_3(String beneficiary_3) { 
    this.beneficiary_3 = beneficiary_3; 
    } 
    public String getBeneficiary_4() { 
    return beneficiary_4; 
    } 
    public void setBeneficiary_4(String beneficiary_4) { 
    this.beneficiary_4 = beneficiary_4; 
    } 
    public String getBeneficiary_5() { 
    return beneficiary_5; 
    } 
    public void setBeneficiary_5(String beneficiary_5) { 
    this.beneficiary_5 = beneficiary_5; 
    } 

    @Override 
    public String toString() { 
    return "Payment [id=" + id + ", ibanSender=" + ibanSender + ", ibanReceiver=" + ibanReceiver + ", beneficiary=" + beneficiary + ", executionDate=" + executionDate + ", creationDate=" + creationDate + ", currency=" + currency + ", amount=" + amount + ", fees=" + fees + ", status=" + status + ", description=" + description + ", total=" + total + "]"; 
    } 

    public PaymentCategory getPaymentCategory() { 
    return paymentCategory; 
    } 
    public void setPaymentCategory(PaymentCategory paymentCategory) { 
    this.paymentCategory = paymentCategory; 
    } 
    public String getStandingOrderId() { 
    return standingOrderId; 
    } 
    public void setStandingOrderId(String standingOrderId) { 
    this.standingOrderId = standingOrderId; 
    } 
}

編輯：這裏是堆棧跟蹤：

java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 48 
com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:176) 
com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:93) 
com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:172) 
com.google.gson.Gson.fromJson(Gson.java:795) 
com.google.gson.Gson.fromJson(Gson.java:761) 
com.google.gson.Gson.fromJson(Gson.java:710) 
com.google.gson.Gson.fromJson(Gson.java:682) 
ch.ti8m.bank.payment.scanbuy.controller.ScanAndBuyController.preparePayment(ScanAndBuyController.java:58) 
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
java.lang.reflect.Method.invoke(Method.java:601) 
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219) 
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) 
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:746) 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:687) 
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925) 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915) 
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:822) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:647) 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:180) 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947) 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009) 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) 
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312) 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
java.lang.Thread.run(Thread.java:722)

有沒有人有一個想法，爲什麼我收到錯誤消息？

在此先感謝

來源

2013-04-12 gmazlami

'私人PaymentType paymentType;'' 「paymentType」：「ACCOUNT_TO_ACCOUNT」， '付款類型是一個對象，但JSON其表示爲一個字符串。發佈整個堆棧跟蹤，我們可以驗證這一點。 –

@Deepak Bala：我發佈了堆棧跟蹤。感謝您使用付款類型指出。 PaymentType是一個枚舉，包含像ACCOUNT_TO_ACCOUNT這樣的條目。我怎樣才能解決這個問題？ – gmazlami

你的意思是你必須使用那個'Payment'類，但是你不能修改它？ – MikO

GSON無法解析creationDate字段的值，因爲它不知道如何處理喬達時間datetime對象。

嘗試使用GsonBuilder的registerTypeAdapter方法註冊此類的類型適配器。

Gson gson = new GsonBuilder().registerTypeAdapter(DateTime.class, new JsonDeserializer<DateTime>() { 
    @Override 
    public DateTime deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) 
      throws JsonParseException { 
     return new DateTime(json.getAsString()); 
    } 
}).create();

來源

2013-04-15 09:44:07 IngmarStein

我試圖將此類型的適配器添加到我的類中，但它沒有編譯，因爲它要求我返回DateTime而不是Date –

使用GSON庫的JSON：錯誤期望的BEGIN_OBJECT但是STRING

回答

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