CODEWITHSUNDEEP
javajsonajaxrestjax-rs
tpsaitwal
tpsaitwal

Reputation: 422

How to post json object from ajax to java class without without servlet but with JAX-RS?

I am new to JAX-RS, I am trying to learn new things about it. I am stuck with one issue regarding, creating a JSON object in Java Script, posting it through ajax to a Java class using JAX-RS and annotations and creating a JSON file out of it. I am creating a Maven project for it. Can anyone please suggest me any tutorial for this. I am trying to implement it from past 1 week but unable to do anything.

Any suggestions appreciated. My POST annotation in Java is:

@POST
@Path("/post")
@Consumes(MediaType.APPLICATION_JSON) 
@Produces(MediaType.APPLICATION_JSON)
public void post(Message obj){
System.out.println("in post");
String v_id = obj.getID();
String v_email = obj.getEmail();
String v_checkedornot =  obj.getCheckedOrNot();
System.out.println("id " + v_id +" email " + v_email + " checkedornot " + v_checkedornot);
}

And my AJAX POST is:

var passingObject = {
        ID : '123456',
        userEmail : 'a.a@a',
        ApproverFlag : 'true'
    }

var passobj = JSON.stringify(passingObject);
    $.ajax({
    url: './webapi/messages/post',
    type: 'POST',
    contentType:"application/json",
    data: passobj,
    dataType:'json',
    success:function(data){
        alert(JSON.stringify(data));
    }
},'json');

Upvotes: 1

Views: 2648

Answers (2)

Ram
Ram

Reputation: 55

You have to set the contentType as JSON and in the service side you need to annotate method like below

@Produces(MediaType.APPLICATION_JSON) // produces JSON object as response
@Consumes(MediaType.APPLICATION_JSON)

Upvotes: -1

Paul Samsotha
Paul Samsotha

Reputation: 208964

Just map the Javascript objects to Java objects. Here is basic mapping. It's pretty simple.

Javascript Object maps to Java object (or POJO)

var obj = {};

public class MyObject {}

Javascript properties map to Java fields/properties

var obj = {
    firstName: "Tejas",
    lastName: "Saitwal"
}

public class MyObject {
    private String firstName;
    private String lastName;
    // getters-setters
}

Javascript arrays map to Java List or Java array.

var obj = {
    firstName: "Tejas",
    lastName: "Saitwal",
    hobbies: ["dancing", "singing"]
}

public class MyObject {
    private String firstName;
    private String lastName;
    private List<String> hobbies;
    // getters-setters
}

Javascript nested objects map to Java nested objects

var obj = {
    firstName: "Tejas",
    lastName: "Saitwal",
    hobbies: ["dancing", "singing"],
    address: {
        street: "1234 main st",
        city: "NYC"
    }
}

public class MyObject {
    private String firstName;
    private String lastName;
    private List<String> hobbies;
    private Address address;
    // getters-setters
}
public class Address {
    private String street;
    private String city;
}

Javascript lists of objects map to Java List<Type> or Type[]

var obj = {
    firstName: "Tejas",
    lastName: "Saitwal",
    hobbies: ["dancing", "singing"],
    address: {
        street: "1234 main st",
        city: "NYC"
    },
    friends: [
        { name: "friend1", phone: "123456578" },
        { name: "friend2", phone: "123454567" }
    ]
}

public class MyObject {
    private String firstName;
    private String lastName;
    private List<String> hobbies;
    private Address address;
    private List<Friend> friends;
    // getters-setters
}
public class Address {
    private String street;
    private String city;
}
public class Friend {
    private String name;        
    private String phone;
}

Now you have a Java class (MyObject) that maps cleanly with the Javascript object. So you can have MyObject as a method parameter.

@POST
@Consumes("application/json")
public Response post(MyObject obj) {}

$.ajax({
    url: url,
    contentType: "application/json",
    data: JSON.stringify(obj)
});

That's not all. You need a provider (or MessageBodyReader) that knows how to deserialize the JSON into your POJO. For that Jackson is my preferred way to go. Just add this Maven dependency

<dependency>
    <groupId>com.fasterxml.jackson.jaxrs</groupId>
    <artifactId>jackson-jaxrs-json-provider</artifactId>
    <version>2.6.0</version>
</dependency>

Then you need to register the JacksonJsonProvider with your application. There are a bunch of ways this can be done, but without know the JAX-RS implementation and version you are using, I would have to list all the different ways. So if you are unsure about how to register it, please let me know the JAX-RS implementation you are using, the version of the implementation, and show how you are currently configuring your application (i.e. web.xml or Java config).

See Also:

Upvotes: 2

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