How to read JSON array values in Spring controller

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I would like to iterate Products and get the list of name,code and price and set in my Model class. Any help would be really appreciated - how can I iterate this. When I use obj.get("Products") - it just printing as string - got stuck to iterate.

{
    "id": "skd3303ll333",
    "Products": [{
            "name": "apple",
            "code": "iphone-393",
            "price": "1939"

        },
        {
            "name": "ipad",
            "code": "ipad-3939",
            "price": "900"

        }
    ]
}


@PostMapping(path="/create", consumes=MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Object> create(@RequestBody  Map<String, Object> obj ) { 
System.out.println("Products :" + obj.get("Products"));
  }

There are two ways to do this,

1) By type casting (personally i will not prefer this)

List<Map<Object,Object>> productslist = (List<Map<Object, Object>>) obj.get("products");
    for(Map entry: productslist) {
        for(Object s: entry.keySet()) {
            System.out.println(s.toString());
            System.out.println(entry.get(s).toString());

        }
    }

2) Mapping directly to Model class, for this approach you need Jackson library in buildpath

@JsonIgnoreProperties(unknown =true)
public class Customer {

@JsonProperty("id")
private String id;
@JsonProperty("products")
private List<Products> products;

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

public List<Products> getProducts() {
    return products;
}

public void setProducts(List<Products> products) {
    this.products = products;
   }

}
 @JsonIgnoreProperties(unknown =true)
 class Products{
@JsonProperty("name")
private String name;
@JsonProperty("code")
private String code;
@JsonProperty("price")
private String price;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getCode() {
    return code;
}

public void setCode(String code) {
    this.code = code;
}

public String getPrice() {
    return price;
}

public void setPrice(String price) {
    this.price = price;
   }

}

Controller

public ResponseEntity<Object> create(@RequestBody  Customer obj ) {

Get a Value by Key in a JSONArray, Learn how to parse a JSONArray to get all the mapped values for a given key. I just announced the new Learn Spring course, focused on the  How to read Json array data using JsonArray? This page shows how to read Json array data using JsonArray object. Note: Refer How to read Json data using JsonReader? page for dependent libraries. Here is the input json file:

You are trying to process the json using a Map<String, Object> obj, which could be possible in some way, but mostly what you want to do is define a single or multiple POJO classes. These represent the json.

public class IdWrapper {
    private String id;
    @JsonProperty("Products")
    private List<Product> products;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public List<Product> getProducts() {
        return products;
    }
}

public class Product {
    private String name;
    private String code;
    private String price;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public String getPrice() {
        return price;
    }

    public void setPrice(String price) {
        this.price = price;
    }
}

And in you controller like this:

@RestController
@RequestMapping("test")
public class DemoController {
    @PostMapping()
    public void test(@RequestBody IdWrapper productsWrapper) {
        System.out.println();
    }
}

How to pass JSON Object string or JSONArray string from javascript , We usually send primitive data to spring controller by using But how to pass whole JSONObject string or JSONArray string to spring controller directly. Jackson will serialize and deserialize to send data between server and client. Can you provide how we write the client side code (jsp) to set values for  To read an array from a JSON file using a Java program − Instantiate the JSONParser class of the json-simple library. JSONParser jsonParser = new JSONParser(); Parse the contents of the obtained object using the parse() method.

You need POJO structure with two classes:

public class Product {
    private String name;
    private String code;
    private int price;
}

public class ProductsGroup {
    private long id;
    private List<Product> products;
    // getters/setters
}

And change your method signature to:

@PostMapping(path="/create", consumes=MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<ProductsGroup> create(@RequestBody ProductsGroup productGroup) 
{ 
   System.out.println("Products :" + productGroup.getProducts());
}

Can I fetch a JSON object in my spring controller without using a , AppSign In. Can I fetch a JSON object in my spring controller without using a model object? How do I sort a JSON array/object pulled from API? 1,323 Views​. JSON is an alternative to XML for interchanging messages between the servers, communicating with RESTful web services, and more. It is a lightweight, language-independent, and human-readable data interchange format that is easy to read and write.

Pass JSON Array to Spring Controller - json - html, Pass JSON Array to Spring Controller - json. I need to pass an array of an object to my controller. Default value for Spring Data REST projection values? When trying to fetch a query result from Elasticsearch and map it to a Kotlin data  In Spring REST JSON example, we will learn to write RESTful webservices capable of returning JSON representations of resources. We will use MappingJackson2JsonView to resolve views to JSON body. Read More: Spring REST XML tutorial. 1. Spring REST JSON – @ResponseBody Annotation. This first technique is simple and easy.

Chapter 15. JSON Add-On, This method will convert a JSON array document, passed in as a method the @​RooJson annotation, you can create Spring MVC scaffolding for your JSON will also generate a method to retrieve a document containing a JSON array if the an HTTP GET request with a number of request parameters which define the  Arrays in JSON are almost the same as arrays in JavaScript. In JSON, array values must be of type string, number, object, array, boolean or null. In JavaScript, array values can be all of the above, plus any other valid JavaScript expression, including functions, dates, and undefined.

How to Read JSON Object From File in Java? • Crunchify, A JSON object. Key value pairs are unordered. JSONObject supports java.util.​Map interface. JSONObject jsonObject = (JSONObject) obj;. // A JSON array. In this tutorial we will learn how to parse JSON data in Spring Boot using the org.springframework.boot.json.JsonParser. The simplest way to parse JSON Strings in Spring Boot is by means of the org.springframework.boot.json API which is native in Spring Boot. Let's see a concrete example. Consider the following REST Service: https

Comments
  • why don't you map this response directly into model using jackson
  • How to do that? Sorry I'm new to Spring and Java - if its very basic question