Question

我需要解析下面的JSON内容。目前我已经存储了inflat文件并阅读它。我已经给出了创建的示例POJO类以及我在下面尝试过的代码。

尝试了两种不同的方法，两者都给出了以下错误

Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 3 path $

Json文件

{
    "DeviceCommon": {
        "ASIdentifier": "123",
        "DatadeliveyMechanism": "notify",
        "MobileOriginatorCallbackReference": {
            "url": "http://application.example.com/inbound/notifications/modatanotification/"
        },
        "AccessiblityCallbackReference": {
            "url": "http://application.example.com/inbound/notifications/accessibilitystatusnotification"
        }
    },
    "DeviceList": [{
        "ExternalIdentifer": "123456@mydomain.com",
        "msisdn": "123456",
        "senderName": "Device1",
        "MobileOriginatorCallbackReference": {
            "notifyURL": "http://application.example.com/inbound/notifications/modatanotification/"
        },
        "ConfigurationResultCallbackReference": {
            "notifyURL": "http://application.example.com/inbound/notifications/configurationResult"
        },
        "ASreferenceID": "AS000001",
        "NIDDduration": "1d"
    }]
}

POJO课程：
注意：我在这里只提到了两个类。

package com.As.jsonmodel.configrequest;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

@JsonIgnoreProperties(ignoreUnknown = true)

public class ConfigurationRequest
{
    private DeviceList[] DeviceList;

    private DeviceCommon DeviceCommon;

    public DeviceList[] getDeviceList ()
    {
        return DeviceList;
    }

    public void setDeviceList (DeviceList[] DeviceList)
    {
        this.DeviceList = DeviceList;
    }

    public DeviceCommon getDeviceCommon ()
    {
        return DeviceCommon;
    }

    public void setDeviceCommon (DeviceCommon DeviceCommon)
    {
        this.DeviceCommon = DeviceCommon;
    }

    @Override
    public String toString()
    {
        return "ClassPojo [DeviceList = "+DeviceList+", DeviceCommon = "+DeviceCommon+"]";
    }
}

package com.As.jsonmodel.configrequest;


public class DeviceList
{
    private MobileOriginatorCallbackReference MobileOriginatorCallbackReference;

    private String NIDDduration;

    private String ASreferenceID;

    private String senderName;

    private String ExternalIdentifer;

    private String msisdn;

    private ConfigurationResultCallbackReference ConfigurationResultCallbackReference;

    public MobileOriginatorCallbackReference getMobileOriginatorCallbackReference ()
    {
        return MobileOriginatorCallbackReference;
    }

    public void setMobileOriginatorCallbackReference (MobileOriginatorCallbackReference MobileOriginatorCallbackReference)
    {
        this.MobileOriginatorCallbackReference = MobileOriginatorCallbackReference;
    }

    public String getNIDDduration ()
    {
        return NIDDduration;
    }

    public void setNIDDduration (String NIDDduration)
    {
        this.NIDDduration = NIDDduration;
    }

    public String getASreferenceID ()
    {
        return ASreferenceID;
    }

    public void setASreferenceID (String ASreferenceID)
    {
        this.ASreferenceID = ASreferenceID;
    }

    public String getSenderName ()
    {
        return senderName;
    }

    public void setSenderName (String senderName)
    {
        this.senderName = senderName;
    }

    public String getExternalIdentifer ()
    {
        return ExternalIdentifer;
    }

    public void setExternalIdentifer (String ExternalIdentifer)
    {
        this.ExternalIdentifer = ExternalIdentifer;
    }

    public String getMsisdn ()
    {
        return msisdn;
    }

    public void setMsisdn (String msisdn)
    {
        this.msisdn = msisdn;
    }

    public ConfigurationResultCallbackReference getConfigurationResultCallbackReference ()
    {
        return ConfigurationResultCallbackReference;
    }

    public void setConfigurationResultCallbackReference (ConfigurationResultCallbackReference ConfigurationResultCallbackReference)
    {
        this.ConfigurationResultCallbackReference = ConfigurationResultCallbackReference;
    }

    @Override
    public String toString()
    {
        return "ClassPojo [MobileOriginatorCallbackReference = "+MobileOriginatorCallbackReference+", NIDD duration = "+NIDDduration+", AS referenceID = "+ASreferenceID+", senderName = "+senderName+", ExternalIdentifer = "+ExternalIdentifer+", msisdn = "+msisdn+", ConfigurationResultCallbackReference = "+ConfigurationResultCallbackReference+"]";
    }
}

Json Reader
Approach1：

        BufferedReader br = null;
        try {
            br = new BufferedReader(  
                     new FileReader("/home/raj/apache-tomcat-8.0.3/webapps/file.json"));
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }  
        JsonReader jsonReader = new JsonReader(new FileReader("/home/raj/apache-tomcat-8.0.3/webapps/file.json"));

        jsonReader.beginObject();

        while (jsonReader.hasNext()) {

        String name = jsonReader.nextName();
            if (name.equals("DeviceCommon")) {
                 readApp(jsonReader);

            }
        }

        jsonReader.endObject();
        jsonReader.close();
    }

    public static void readApp(JsonReader jsonReader) throws IOException{
        jsonReader.beginObject();
         while (jsonReader.hasNext()) {
             String name = jsonReader.nextName();
             System.out.println(name);
             if (name.contains("ASIdentifier")){
                 jsonReader.beginObject();
                 while (jsonReader.hasNext()) {
                     String n = jsonReader.nextName();
                     if (n.equals("MobileOriginatorCallbackReference")){
                         System.out.println(jsonReader.nextString());
                     }
                     if (n.equals("AccessiblityCallbackReference")){
                         System.out.println(jsonReader.nextInt());
                     }
                     if (n.equals("DeviceList")){
                         jsonReader.beginArray();
                         while  (jsonReader.hasNext()) {
                              System.out.println(jsonReader.nextString());
                         }
                         jsonReader.endArray();
                     }
                 }
                 jsonReader.endObject();
             }

         }
         jsonReader.endObject();
    }


    // TODO Auto-generated method stub

Aproach2：

Gson gson = new Gson();
DeviceList [] myTypes = gson.fromJson(new FileReader("/home/raj/apache-tomcat-8.0.3/webapps/file.json"), DeviceList[].class);
System.out.println(gson.toJson(myTypes));

任何有关如何解析此文件的指示都会有所帮助。

Answer 1

以下是如何使用Gson：

import java.io.FileReader;
import java.util.Arrays;
import com.google.gson.Gson;
import com.google.gson.annotations.SerializedName;

public class Main {
    public static void main(String[] args) throws Exception {
        Data data = new Gson().fromJson(new FileReader("data.json"), Data.class);
        System.out.println(data);
    }
}

class Data {

    @SerializedName("DeviceCommon")
    DeviceCommon deviceCommon;

    @SerializedName("DeviceList")
    DeviceListEntry[] deviceList;

    @Override
    public String toString() {
        return "Data{" +
                "\n  deviceCommon=" + deviceCommon +
                "\n  deviceList=" + Arrays.toString(deviceList) +
                "\n}";
    }
}

class DeviceCommon {

    @SerializedName("ASIdentifier")
    String asIdentifier;

    @SerializedName("DatadeliveyMechanism")
    String datadeliveyMechanism;

    @SerializedName("MobileOriginatorCallbackReference")
    Url mobileOriginatorCallbackReference;

    @SerializedName("AccessiblityCallbackReference")
    Url accessiblityCallbackReference;

    @Override
    public String toString() {
        return "DeviceCommon{" +
                "\n    asIdentifier='" + asIdentifier + '\'' +
                "\n    datadeliveyMechanism='" + datadeliveyMechanism + '\'' +
                "\n    mobileOriginatorCallbackReference=" + mobileOriginatorCallbackReference +
                "\n    accessiblityCallbackReference=" + accessiblityCallbackReference +
                "\n  }";
    }
}

class DeviceListEntry {

    @SerializedName("ExternalIdentifer")
    String externalIdentifer;

    String msisdn;

    String senderName;

    @SerializedName("MobileOriginatorCallbackReference")
    NotifyUrl mobileOriginatorCallbackReference;

    @SerializedName("ConfigurationResultCallbackReference")
    NotifyUrl configurationResultCallbackReference;

    @SerializedName("ASreferenceID")
    String asReferenceID;

    @SerializedName("NIDDduration")
    String nidDduration;

    @Override
    public String toString() {
        return "DeviceListEntry{" +
                "\n    externalIdentifer='" + externalIdentifer + '\'' +
                "\n    msisdn='" + msisdn + '\'' +
                "\n    senderName='" + senderName + '\'' +
                "\n    mobileOriginatorCallbackReference=" + mobileOriginatorCallbackReference +
                "\n    configurationResultCallbackReference=" + configurationResultCallbackReference +
                "\n    asReferenceID='" + asReferenceID + '\'' +
                "\n    nidDduration='" + nidDduration + '\'' +
                "\n  }";
    }
}

class Url {

    String url;

    @Override
    public String toString() {
        return url;
    }
}

class NotifyUrl {

    String notifyURL;

    @Override
    public String toString() {
        return notifyURL;
    }
}

运行Main将产生以下输出：

Data{
  deviceCommon=DeviceCommon{
    asIdentifier='123'
    datadeliveyMechanism='notify'
    mobileOriginatorCallbackReference=http://application.example.com/inbound/notifications/modatanotification/
    accessiblityCallbackReference=http://application.example.com/inbound/notifications/accessibilitystatusnotification
  }
  deviceList=[DeviceListEntry{
    externalIdentifer='123456@mydomain.com'
    msisdn='123456'
    senderName='Device1'
    mobileOriginatorCallbackReference=http://application.example.com/inbound/notifications/modatanotification/
    configurationResultCallbackReference=http://application.example.com/inbound/notifications/configurationResult
    asReferenceID='AS000001'
    nidDduration='1d'
  }]
}

Gson解析数组字符串

1 个答案: