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jsonrestjakarta-eejerseyjackson
JosephG
JosephG

Reputation: 3253

Process JSON with Jersey and Jackson

I am using jersey in Java. I want to get JSON data sent via a post request. However, I am not sure how to do this, despite my searching. I am able to receive JSON data at a path, yet I can't figure out how to parse it into java variables. I assume that I need to use jackson to do this. However, I don't understand how to pass the received JSON to jackson.

@Path("/register")
public class ResourceRegister 
{
    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    public String RegisterUser(//not sure what to take in here to get the json )
    {
        //code to deal with the json
    }

Upvotes: 1

Views: 1075

Answers (2)

fmucar
fmucar

Reputation: 14558

You just need to place @JsonProperty annotation to your class properties and add that class to your Resource method as paramater.

You might need @JsonIgnoreProperties annotation as well if you are not deserializing everything inside the incoming json

See below:

@POST
@Consumes(MediaType.APPLICATION_JSON)
public String registerUser(MyUser myUser)
{
    //code to deal with the json
}


public class MyUser{
   @JsonProperty
   private String name;
   @JsonProperty
   private String surname;

 //getters & setters & constructors if you need
}

Upvotes: 1

dev2d
dev2d

Reputation: 4262

There are several ways of accepting the JSON and using it in back-end. 1. set POJO elements using JAXB APIs and use object of that POJO class to access passed parameters. this will be helpful while JSON size is large. Example: your service declaration would be as following

@Path("/register")
public class ResourceRegister 
{
    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    public String RegisterUser(RegParams regParams)
    {
        //code to deal with the json
    }
.....
}

and you will write a POJO like following

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
@JsonIgnoreProperties(ignoreUnknown=true)
@JsonWriteNullProperties(false)
public class RegParams implements Serializable {

    @JsonProperty("userId")
    private long userId;

    @JsonProperty("userName")
    private String userName;
..
..
}

  1. retrive JSON as a string and use jersey APIs to work with the same. in this case you can declare your service as following

    @Path("/register")
public class ResourceRegister 
{
    @POST
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    public String RegisterUser(@FormParam("jsonObj")String jsonString)
    {
        //code to deal with the json
    }
.....
}

and you can process that string by using jersey APIs like following

ObjectMapper om = new ObjectMapper();
JsonNode mainNode = om.readTree(jsonString);
//access fields
mainNode.get..(as per data passed, string, int etc)

for more referance you can refer this or this

Upvotes: 2

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