将java类数据转换为JSON格式？

Question

I am doing the Java project with spring .So I am using the Jackson library to convert to get the JSON format.

My java Class will be ,

public class ChatInteraction extends Interaction{

    private int ticketId;
    private String name;

    private String interactionType ;
    private LinkedList<InteractionInfo> interactions;

    public ChatInteraction(Message response) {
        super(response);
        interactions = new LinkedList<InteractionInfo>();
    }


    public int getTicketId() {
        return ticketId;
    }

    public void setTicketId(int ticketId) {
        this.ticketId = ticketId;
        System.out.println("Ticket Id for Interaction : "+this.ticketId);
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
        System.out.println("Name for Interaction : "+this.name);
    }


    public LinkedList<InteractionInfo> getInteractions() {
        return interactions;
    }

    public String getInteractionType() {
        return interactionType;
    }

    public void setInteractionType(String interactionType) {
        this.interactionType = interactionType;
    }


    public void addInteraction(InteractionInfo interaction) {
        this.interactions.add(interaction);
    }


    public void accept(int proxyId,String intxnId,int ticketId){

        RequestAccept reqAccept = RequestAccept.create();
        reqAccept.setProxyClientId(proxyId);
        reqAccept.setInteractionId(intxnId);
        reqAccept.setTicketId(ticketId);

        System.out.println("New Chat RequestAccept Request Object ::: "+reqAccept.toString());

        try{
            if(intxnProtocol.getState() == ChannelState.Opened){

                Message response = intxnProtocol.request(reqAccept);

                System.out.println("New Chat RequestAccept Response ::: "+response.toString());

                if(response != null ){

                    if( response.messageId() == EventAck.ID){
                        System.out.println("Accept new chat  success !");
                        //EventAccepted accept = (EventAccepted)response;
                        //return "New chat Interaction accepted";
                    }else if(response.messageId() == EventError.ID){
                        System.out.println("Accept new chat Failed !");
                        //return "New chat Interaction rejected";
                    }
                }

            }else{
                System.out.println("RequestAccept failure due to Interaction protocol error  !"); 
            }


        }catch(Exception acceptExcpetion){
            acceptExcpetion.printStackTrace();
        }

    }


    public void join(String sessionId, String subject) {

        RequestJoin join = RequestJoin.create();
        join.setMessageText(MessageText.create(""));
        join.setQueueKey("Resources:"); //Add the chat-inbound-key in multimedia of the optional tab values of the softphone application in CME
        join.setSessionId(sessionId);
        join.setVisibility(Visibility.All);
        join.setSubject(subject);
        KeyValueCollection kvc = new KeyValueCollection();
        join.setUserData(kvc);

        System.out.println("Join Request Object ::: "+join.toString());

        try {

            if(basicProtocol != null && basicProtocol.getState() == ChannelState.Opened){
                Message response = basicProtocol.request(join);

                if(response != null){

                    System.out.println("RequestJoin response ::: "+response);

                    if (response.messageId() == EventSessionInfo.ID) {
                        System.out.println("Join Request success !");
                    }else{
                        System.out.println("Join Request Failed !");
                    }
                }
            }else{
                System.out.println("BasicChat protocol Error !");
                //return "BasicChat protocol Error !";
            }
        } catch (ProtocolException e) {
            e.printStackTrace();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        }

    }


}

I need to get only the interactionType and interactions property of this class in the JSON format like ,

 {"interactionType":"invite","interactions" : [{"xx":"XX","yy":"YY"},{"xx":"XX","yy":"YY"}]} 

Note :

1. I don't need the other properties of this class.

2. Also there is no SETTER for the interactions property . Instead of that I have the addInteractions() method . Does this affects any behaviour of JSON conversion ?

3. Also I have some other methods like accept(...) , Join(...) .

4. I am using the jackson-all-1.9.0.jar

Answer 1

You can annotate the unneeded fields with @JsonIgnore - see Jackson's manual on annotations . That's what it will look like, using your code:

public class ChatInteraction extends Interaction{
    @JsonIgnore
    private int ticketId;
    @JsonIgnore
    private String name;

    private String interactionType ;
    private LinkedList<InteractionInfo> interactions;

Answer 2

You can use achieve this by using the @JsonIgnoreProperties annotation that can be used on class level .

From JavaDoc :

Annotation that can be used to either suppress serialization of properties (during serialization), or ignore processing of JSON properties read (during deserialization).

Example:

 // to prevent specified fields from being serialized or deserialized
 // (i.e. not include in JSON output; or being set even if they were included)
 \@JsonIgnoreProperties({ "internalId", "secretKey" })

Example, In your case:

@JsonIgnoreProperties({ "ticketId", "name" })
public class ChatInteraction extends Interaction{
    ....
}

Answer 3

Finally I got the solution by others answers in the thread and similar answers in stackoverflow,

1. I marked the @JsonIgnore in the unwanted field in the sub class and super class suggested by fvu .

2. I have used the myObjectMapper.setVisibility(JsonMethod.FIELD, Visibility.ANY); in my objectMapper suggested in other thread like,

    ObjectMapper mapp = new ObjectMapper(); mapp.setVisibility(JsonMethod.FIELD, Visibility.ANY); try { json = mapp.writeValueAsString(info); info.clear(); System.out.println("Chat Info in JSON String is :::> "+json); } catch (Exception e) { e.printStackTrace(); }