jacksonを使用してjsonリストをPOJOにシリアル化する方法は？

Question

次は2 POJOのための2つのエントリを持っている私のJSONリストです：

[{"userEmail":null,"userId":5,"userName":"rahul","userPassword":"asd",}, {"addressId":1,"userApartment":"YSR skyline","userCity":"Bangalore","userId":5,"userLocality":"Venkateshwara Layout","userStreet":"Mahadevapura"}] 

次のように各POJOが定義されています

public class UserLoginDataObj { 

private int userId; 
private String userName; 
private String userEmail; 
private String userPassword; 

public String getUserPassword() { 

    return userPassword; 
} 

public void setUserPassword(String userPassword) { 
    this.userPassword = userPassword; 
} 

public int getUserId() { 
    return userId; 
} 

public void setUserId(int userId) { 
    this.userId = userId; 
} 

public String getUserName() { 
    return userName; 
} 

public void setUserName(String userName) { 
    this.userName = userName; 
} 

public String getUserEmail() { 
    return userEmail; 
} 

public void setUserEmail(String userEmail) { 
    this.userEmail = userEmail; 
} } 

と

public class AddAddressObj { 
private String userApartment; 
private String userStreet; 
private String userLocality; 
private String userCity; 
private int addressId; 
private int userId; 


public int getAddressId() { 
    return addressId; 
} 

public void setAddressId(int addressId) { 
    this.addressId = addressId; 
} 

public int getUserId() { 
    return userId; 
} 

public void setUserId(int userId) { 
    this.userId = userId; 
} 

public String getUserApartment() { 
    return userApartment; 
} 

public void setUserApartment(String userApartment) { 
    this.userApartment = userApartment; 
} 

public String getUserStreet() { 
    return userStreet; 
} 

public void setUserStreet(String userStreet) { 
    this.userStreet = userStreet; 
} 

public String getUserLocality() { 
    return userLocality; 
} 

public void setUserLocality(String userLocality) { 
    this.userLocality = userLocality; 
} 

public String getUserCity() { 
    return userCity; 
} 

public void setUserCity(String userCity) { 
    this.userCity = userCity; 
}} 

私はシリアライズする必要がありますjsonsonからJACKSONを使用してこれら2つのPOJOクラスにデータを転送します

何か助けていただければ幸いです。 ありがとうございます。あなたはあなたにこれらのクラスを与えるために非直列化されるこれら二つのPOJOを持っているユーザーと呼ばれる1つの以上のクラスを追加する必要があります:)

Answer 1

Arpit、

：このクラスの追加により

package com.yourpackage.model; 

import com.fasterxml.jackson.databind.annotation.JsonDeserialize; 
import com.yourpackage.deserializer.UserDeserializer; 

@JsonDeserialize(using = UserDeserializer.class) 
public class User { 
    private UserLoginDataObj obj; 
    private AddAddressObj address; 

    public UserLoginDataObj getUserLoginDataObj() { 
     return obj; 
    } 

    public void setUserLoginDataObj(UserLoginDataObj obj) { 
     this.obj = obj; 
    } 

    public AddAddressObj getAddAddressObj() { 
     return address; 
    } 

    public void setAddAddressObj(AddAddressObj address) { 
     this.address = address; 
    } 
} 

を、次のコードを使用して逆シリアル化できます。

package com.yourpackage.deserializer; 

import java.io.IOException; 
import java.util.Iterator; 

import com.fasterxml.jackson.core.JsonParser; 
import com.fasterxml.jackson.core.JsonProcessingException; 
import com.fasterxml.jackson.core.ObjectCodec; 
import com.fasterxml.jackson.databind.DeserializationContext; 
import com.fasterxml.jackson.databind.JsonDeserializer; 
import com.fasterxml.jackson.databind.JsonNode; 
import com.yourpackage.model.AddAddressObj; 
import com.yourpackage.model.User; 
import com.yourpackage.model.UserLoginDataObj; 

public class UserDeserializer extends JsonDeserializer<User> { 

    @Override 
    public User deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException { 

     ObjectCodec oc = jsonParser.getCodec(); 
     JsonNode nodes = oc.readTree(jsonParser); 

     UserLoginDataObj obj = new UserLoginDataObj(); 
     AddAddressObj address = new AddAddressObj(); 

     for(int i = 0; i < nodes.size(); i++) { 
      JsonNode node = nodes.get(i); 

      Iterator<String> fields = node.fieldNames(); 
      boolean isUser = false; 

      while(fields.hasNext()) { 
       String field = fields.next(); 

       if(!field.equals("userId")) { 
        if(field.equals("userEmail") || field.equals("userName") || field.equals("userPassword")) { 
         isUser = true; 
         break; 
        } 
       } 
      } 

      if(isUser) { 
       String userEmail = "", userName = "", userPassword = ""; 
       int userId = 0; 

       try { 
        userEmail = node.get("userEmail").textValue(); 
       } catch(Exception e) { 
        userEmail = null; 
       } 

       try { 
        userName = node.get("userName").textValue(); 
       } catch(Exception e) { 
        userName = null; 
       } 

       try { 
        userPassword = node.get("userPassword").textValue(); 
       } catch(Exception e) { 
        userPassword = null; 
       } 

       try { 
        userId = node.get("userId").intValue(); 
       } catch(Exception e) { 
        userId = 0; 
       } 

       obj.setUserEmail(userEmail); 
       obj.setUserId(userId); 
       obj.setUserName(userName); 
       obj.setUserPassword(userPassword); 

      } else { 
       String userApartment = "", userStreet = "", userLocality = "", userCity = ""; 
       int addressId = 0; 
       int userId = 0; 

       try { 
        userApartment = node.get("userApartment").textValue(); 
       } catch(Exception e) { 
        userApartment = null; 
       } 

       try { 
        userStreet = node.get("userStreet").textValue(); 
       } catch(Exception e) { 
        userStreet = null; 
       } 

       try { 
        userLocality = node.get("userLocality").textValue(); 
       } catch(Exception e) { 
        userLocality = null; 
       } 

       try { 
        userCity = node.get("userCity").textValue(); 
       } catch(Exception e) { 
        userCity = null; 
       } 

       try { 
        addressId = node.get("addressId").intValue(); 
       } catch(Exception e) { 
        addressId = 0; 
       } 

       try { 
        userId = node.get("userId").intValue(); 
       } catch(Exception e) { 
        userId = 0; 
       } 

       address.setAddressId(addressId); 
       address.setUserApartment(userApartment); 
       address.setUserCity(userCity); 
       address.setUserId(userId); 
       address.setUserLocality(userLocality); 
       address.setUserStreet(userStreet); 
      } 
     } 

     User u = new User(); 

     u.setAddAddressObj(address); 
     u.setUserLoginDataObj(obj); 

     return u; 
    } 
} 

このコードは、提供したjsonファイルに対してテストされています。

Answer 2

あなたは説明hereとして配列項目からオブジェクトのプロパティを読み取るためにジャクソンを伝えるためにJsonFormat.Shape.ARRAYにshape属性を設定するJsonFormatアノテーションを使用することができます。

下記の完全な例を参照してください。他の2つのオブジェクトを集約するクラスUserに注意してください。

import com.fasterxml.jackson.annotation.JsonFormat; 
import com.fasterxml.jackson.annotation.JsonPropertyOrder; 
import com.fasterxml.jackson.databind.ObjectMapper; 
import java.io.IOException; 

public class JacksonFormArray { 
    static final String JSON = "[{\"userEmail\":null,\"userId\":5,\"userName\":\"rahul\"," 
      + "\"userPassword\":\"asd\"}, {\"addressId\":1,\"userApartment\":" 
      + "\"YSR skyline\",\"userCity\":\"Bangalore\",\"userId\":5,\"userLocality\"" 
      + ":\"Venkateshwara Layout\",\"userStreet\":\"Mahadevapura\"}]"; 

    static class UserLoginDataObj { 
     public int userId; 
     public String userName; 
     public String userEmail; 
     public String userPassword; 

     @Override 
     public String toString() { 
      return "UserLoginDataObj{" + 
        "userId=" + userId + 
        ", userName='" + userName + '\'' + 
        ", userEmail='" + userEmail + '\'' + 
        ", userPassword='" + userPassword + '\'' + 
        '}'; 
     } 
    } 

    static class AddAddressObj { 
     public String userApartment; 
     public String userStreet; 
     public String userLocality; 
     public String userCity; 
     public int addressId; 
     public int userId; 

     @Override 
     public String toString() { 
      return "AddAddressObj{" + 
        "userApartment='" + userApartment + '\'' + 
        ", userStreet='" + userStreet + '\'' + 
        ", userLocality='" + userLocality + '\'' + 
        ", userCity='" + userCity + '\'' + 
        ", addressId=" + addressId + 
        ", userId=" + userId + 
        '}'; 
     } 
    } 

    @JsonFormat(shape = JsonFormat.Shape.ARRAY) 
    @JsonPropertyOrder({ "login", "address"}) 
    static class User { 
     public UserLoginDataObj loging; 
     public AddAddressObj address; 

     @Override 
     public String toString() { 
      return "User{" + 
        "loging=" + loging + 
        ", address=" + address + 
        '}'; 
     } 
    } 

    public static void main(String[] args) throws IOException { 
     final ObjectMapper mapper = new ObjectMapper(); 
     System.out.println(mapper.readValue(JSON, User.class)); 
    } 
} 

出力：私はこれらのクラスの名前の変数としてではなく、シリアル化ではないの名前を持つPOJOを作成しようとしている

User{loging=UserLoginDataObj{userId=5, userName='rahul', userEmail='null', userPassword='asd'}, address=AddAddressObj{userApartment='YSR skyline', userStreet='Mahadevapura', userLocality='Venkateshwara Layout', userCity='Bangalore', addressId=1, userId=5}}