ObjectMapper - JSON字符串到Java对象不工作

我有一个需求，我需要从API转换JSON响应并将其作为XML发送到最终客户端。ObjectMapper - JSON字符串到Java对象不工作

我能够从API成功接收JSON（输出粘贴在下面），但无法使用ObjectMapper将其转换为Java对象。我没有得到任何错误;但是当我返回“GetCardInfo”对象时，它是空的。

我试图通过谷歌搜索，但无法找到它为什么不工作。如果有人能帮我理解我的代码有什么问题，这将是一个很大的帮助。

import java.io.IOException; 
import java.io.StringReader; 
import java.util.ArrayList; 
import java.util.List; 
import java.lang.Object; 

import javax.annotation.Resource; 
import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.ws.Response; 

import org.apache.commons.lang3.StringUtils; 
import org.apache.http.HttpStatus; 
import org.json.JSONObject; 
import org.json.XML; 
import org.slf4j.ext.XLogger; 
import org.slf4j.ext.XLoggerFactory; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.beans.factory.annotation.Qualifier; 
import org.springframework.stereotype.Component; 
import org.w3c.dom.Document; 
import org.xml.sax.InputSource; 

import com.bhn.webservice.ivr.CardActivationResponse; 
import com.bhn.webservice.ivr.CardInfo; 
import com.bhn.webservice.ivr.ErrorDetails; 
import com.bhn.webservice.ivr.GetCardInfo; 
import com.bhn.webservice.ivr.GetCardInfoReceiveJSONResponse; 
import com.bhn.webservice.ivr.GetCardInfoRequest; 
import com.bhn.webservice.ivr.GetCardInfoResponse; 
import com.bhn.webservice.ivr.GetCardInfoSendJSONRequest; 
import com.bhn.webservice.ivr.GetCardTransactionsReceiveJSONResponse; 
import com.bhn.webservice.ivr.GetCardTransactionsRequest; 
import com.bhn.webservice.ivr.GetCardTransactionsResponse; 
import com.bhn.webservice.ivr.GetCardTransactionsSendJSONRequest; 
import com.bhn.webservice.ivr.IVRKPNResponse; 
import com.bhn.webservice.ivr.IVRResponse; 
import com.bhn.webservice.ivr.IVRWrapperConstants; 
import com.bhn.webservice.ivr.IVRWrapperResponse; 
import com.bhn.webservice.ivr.RequestContext; 
import com.bhn.webservice.ivr.VerifyCardConvertResponse; 
import com.bhn.webservice.ivr.VerifyCardHolderReceiveJSONResponse; 
import com.bhn.webservice.ivr.VerifyCardHolderRequest; 
import com.bhn.webservice.ivr.VerifyCardHolderResponse; 
import com.bhn.webservice.ivr.VerifyCardHolderSendJSONRequest; 
import com.bhn.webservice.ivr.VerifyCardReceiveJSONResponse; 
import com.bhn.webservice.ivr.VerifyCardRequest; 
import com.bhn.webservice.ivr.VerifyCardResponse; 
import com.bhn.webservice.ivr.VerifyCardSendJSONRequest; 
import com.fasterxml.jackson.core.JsonParseException; 
import com.fasterxml.jackson.databind.DeserializationFeature; 
import com.fasterxml.jackson.databind.JsonMappingException; 
import com.fasterxml.jackson.databind.ObjectMapper; 
import com.fasterxml.jackson.databind.SerializationFeature; 
import com.fasterxml.jackson.dataformat.xml.XmlMapper; 
    //XML mapper. 
    ObjectMapper mapper = new XmlMapper(); 
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, 
         false); 
       mapper.enable(SerializationFeature.INDENT_OUTPUT); 
GetCardInfo gci = mapper.readValue(JSONResponse.toString(),GetCardInfo.class);

下面是从JSONResponse.toString（）

{ 
    "transactionId" : "RNQFBKGPZ4M18PLZJA4BDGC32W", 
    "isCompleted" : true, 
    "percentComplete" : "100", 
    "card" : { 
    "id" : "1000000000000098718", 
    "bin" : "451129", 
    "proxyCardNumber" : "603953510161946xxxx", 
    "isActive" : false, 
    "isRegistered" : false, 
    "expirationDate" : "2017-06-30T23:59:59.000+0000", 
    "serviceCode" : "121", 
    "balances" : { 
     "openingBalance" : "5000", 
     "closingBalance" : "5000", 
     "pendingBalance" : "5000", 
     "currencyCode" : "USD" 
    }, 
    "status" : "OPEN", 
    "statusReason" : "NONE", 
    "provisionType" : "PHYSICAL", 
    "accountStatus" : "OPEN", 
    "accountStatusReason" : "NONE", 
    "product" : { 
     "id" : "1000000000000000415", 
     "name" : "EXM Visa Corp LAP", 
     "isActive" : "true", 
     "productIdentifier" : "07675023660", 
     "bin" : "451129", 
     "issuer" : "MetaBank" 
    } 
    } 
}

下面是类GetCardInfo输出

public class GetCardInfo { 

    @XmlElement(name = "transactionId", required = true) 
    public String transactionId; 
    @XmlElement(name = "isCompleted", required = true) 
    public Boolean isCompleted; 
    @XmlElement(name = "percentComplete", required = true) 
    public String percentComplete; 

    @XmlElement(name = "card", required = true) 
    public Card card; //Parent for remaining data 

    public static class Card { 
     @XmlElement(name = "id", required = true) 
     public String id; 
     @XmlElement(name = "bin", required = true) 
     public String bin; 
     @XmlElement(name = "proxyCardNumber", required = true) 
     public String proxyCardNumber; 
     @XmlElement(name = "isActive", required = true) 
     public Boolean isActive; 
     @XmlElement(name = "isRegistered", required = true) 
     public Boolean isRegistered; 
     @XmlElement(name = "expirationDate", required = true, type = String.class) 
     @XmlJavaTypeAdapter(Adapter1 .class) 
     @XmlSchemaType(name = "dateTime") 
     public Date expirationDate; 
     @XmlElement(name = "serviceCode", required = true) 
     public String serviceCode; 
     @XmlElement(name = "balances", required = true) 
     public Balances balances; //Parent for balances data 
     @XmlElement(name = "status", required = true) 
     public String status; 
     @XmlElement(name = "statusReason", required = true) 
     public String statusReason; 
     @XmlElement(name = "provisionType", required = true) 
     public String provisionType; 
     @XmlElement(name = "accountStatus", required = true) 
     public String accountStatus; 
     @XmlElement(name = "accountStatusReason", required = true) 
     public String accountStatusReason; 
     @XmlElement(name = "product", required = true) 
     public Product product; 

     @Override 
     public String toString() { 
      return "Card [id=" + id + ", bin=" + bin + ", " 
        + "proxyCardNumber=" + proxyCardNumber + ", isActive=" + isActive 
        + ", isRegistered=" + isRegistered + ", expirationDate=" + expirationDate 
        + ", serviceCode=" + serviceCode + ", balances=" + balances 
        + ", status=" + status + ", statusReason=" + statusReason 
        + ", provisionType=" + provisionType + ", accountStatus=" + accountStatus 
        + ", accountStatusReason=" + accountStatusReason + ", product=" + product + "]"; 
     } 
    } 

    public static class Balances { 
     @XmlElement(name = "openingBalance", required = true) 
     public String openingBalance; 
     @XmlElement(name = "closingBalance", required = true) 
     public String closingBalance; 
     @XmlElement(name = "pendingBalance", required = true) 
     public String pendingBalance; 
     @XmlElement(name = "currencyCode", required = true) 
     public String currencyCode; 

     @Override 
     public String toString() { 
      return "Balance [openingBalance=" + openingBalance + ", closingBalance=" + closingBalance + ", " 
        + "pendingBalance=" + pendingBalance + ", currencyCode=" + currencyCode + "]"; 
     } 
    } 

    public static class Product { 
     @XmlElement(name = "id", required = true) 
     public String id; 
     @XmlElement(name = "name", required = true) 
     public String name; 
     @XmlElement(name = "isActive", required = true) 
     public String isActive; 
     @XmlElement(name = "productIdentifier", required = true) 
     public String productIdentifier; 
     @XmlElement(name = "bin", required = true) 
     public String bin; 
     @XmlElement(name = "issuer", required = true) 
     public String issuer; 

     @Override 
     public String toString() { 
      return "Card [id=" + id + ", bin=" + bin + ", " 
        + "name=" + name + ", isActive=" + isActive 
        + ", productIdentifier=" + productIdentifier + ", issuer=" + issuer + "]"; 
     } 
    } 

    @Override 
    public String toString() { 
     return "GetCardInfo [transactionId=" + transactionId 
       + ", isCompleted=" + isCompleted 
       + ", percentComplete=" + percentComplete 
       + ", card=" + card + "]"; 
    } 

}

编辑：我把catch块为IOException的，发现我我正在低于IOException。这意味着我的JSON字符串有问题。

在下面添加了我的POM.xml。还为具有ObjectMapper的Java文件添加了以上导入。

赶上（IOException的发送）{ logger.error（ “IOException异常 - ”， e.getMessage（））; e.printStackTrace（）; }

IOException - com.ctc.wstx.exc.WstxUnexpectedCharException: Unexpected character '{' (code 123) in prolog; expected '<' 
at [row,col {unknown-source}]: [1,1]

的pom.xml

<?xml version="1.0" encoding="UTF-8"?> 
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 

    <modelVersion>4.0.0</modelVersion> 

    <organization> 
     <name>xxx</name> 
     <url></url> 
    </organization> 

    <parent> 
     <groupId>com.bhn.poms</groupId> 
     <artifactId>component-parent-pom</artifactId> 
     <version>2.17</version> 
     <relativePath /> 
    </parent> 

    <artifactId>ivr-wrapper-service</artifactId> 
    <groupId>com.bhn.webservice</groupId> 
    <version>1.2.26-SNAPSHOT</version> 
    <name>IVR Wrapper Service Implementation</name> 
    <description>This project defines the java implementation for this service.</description> 

    <properties> 
     <bhn-entity-management-version>2.32</bhn-entity-management-version> 
    </properties> 

    <dependencies> 
     <dependency> 
      <groupId>com.bhn.webservice</groupId> 
      <artifactId>entity-management-service</artifactId> 
      <version>${bhn-entity-management-version}</version> 
     </dependency> 
     <dependency> 
      <groupId>com.bhn.webservice</groupId> 
      <artifactId>ivr-wrapper-domain-model</artifactId> 
      <version>${project.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>com.bhn.webservice</groupId> 
      <artifactId>web-service-client</artifactId> 
      <version>2.41</version> 
     </dependency> 
     <dependency> 
      <groupId>org.apache.httpcomponents</groupId> 
      <artifactId>httpclient</artifactId> 
      <version>4.5</version> 
     </dependency> 
     <dependency> 
      <groupId>org.apache.httpcomponents</groupId> 
      <artifactId>fluent-hc</artifactId> 
      <version>4.5</version> 
     </dependency> 
     <dependency> 
      <groupId>com.fasterxml.jackson.dataformat</groupId> 
      <artifactId>jackson-dataformat-xml</artifactId> 
      <version>2.6.3</version> 
     </dependency> 
     <dependency> 
      <groupId>org.codehaus.woodstox</groupId> 
      <artifactId>woodstox-core-asl</artifactId> 
      <version>4.4.1</version> 
     </dependency> 
     <dependency> 
      <groupId>org.json</groupId> 
      <artifactId>json</artifactId> 
      <version>20160212</version> 
     </dependency> 
    </dependencies> 

    <scm> 
     <connection>scm:git:ssh://[email protected]:7999/custom/ivrwrapper.git</connection> 
     <developerConnection>scm:git:ssh://[email protected]:7999/custom/ivrwrapper.git</developerConnection> 
     <tag>HEAD</tag> 
    </scm> 

</project>

编辑：基于@minus评论我已经将我的JSON字符串到一个XML字符串如下

JSONObject json = new JSONObject(JSONResponse.toString()); 
       xml = XML.toString(json); 
       logger.info("GetCardInfo XML Response for KPN API: {} ", xml);

日志表明，已成功转换为XML。

<percentComplete>100</percentComplete><transactionId>FL2YTNR86KARMVYWWVK3410F4W</transactionId><card><product><productIdentifier>07675023660</productIdentifier><bin>451129</bin><name>EXM Visa Corp LAP</name><id>1000000000000000415</id><isActive>true</isActive><issuer>MetaBank</issuer></product><serviceCode>121</serviceCode><bin>451129</bin><isActive>false</isActive><proxyCardNumber>6039535101619469382</proxyCardNumber><accountStatusReason>NONE</accountStatusReason><accountStatus>OPEN</accountStatus><balances><pendingBalance>5000</pendingBalance><closingBalance>5000</closingBalance><openingBalance>5000</openingBalance><currencyCode>USD</currencyCode></balances><statusReason>NONE</statusReason><provisionType>PHYSICAL</provisionType><isRegistered>false</isRegistered><id>1000000000000098718</id><expirationDate>2017-06-30T23:59:59.000+0000</expirationDate><status>OPEN</status></card><isCompleted>true</isCompleted>

接下来我使用下面的代码将XML字符串反序列化回Java对象。但反序列化不起作用。

GetCardInfo gci = mapper.readValue(xml, GetCardInfo.class); 
        logger.info("Test12 ", gci.toString());

现在我没有得到任何错误，但反序列化不起作用。 GCI对象中的字段为空。

来源

2017-03-13 Vikas Prasad

编译和运行的代码以及pom.xml和导入将会有所帮助。 –

谢谢。我已经添加了pom.xml并导入。我仍然在努力编写一个编译和运行的代码。此应用程序有多个文件，因此需要构建新的新应用程序来演示此错误。 –

我不是杰克逊的大人物，但是你正试图用XML映射器反序列化一个json文档。

杰克逊告诉你，你不能用'{'开始xml。

您应该使用JsonMapper反序列化Json，然后使用XMLMapper对其进行序列化。

我不知道是否有可能为两者注释相同的类。

来源

2017-03-13 22:54:28 minus

非常感谢。根据您的评论，我将我的JSON字符串转换为XML字符串，如下所示： –

感谢@minus的输入。我能找出答案

所有我需要的是类名添加到我的XML字符串如下

字符串输入=“” + XML +“”; 之后，我能够成功反序列化。

来源

2017-03-13 23:40:46

ObjectMapper - JSON字符串到Java对象不工作

回答

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