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This tutorial shows how to
● use @RequestBody to convert JSON from HTTP Request Body into DTO
● by calling DTO Constructor
Syntax
@RequestMapping("/AddPerson")
public String addPerson(@RequestBody PersonDTO personDTO) { ... }
Application Schema [Results]
Spring Boot Starters
GROUP
DEPENDENCY
DESCRIPTION
Web
Spring Web
Enables @Controller and @RequestMapping. Includes Tomcat Server.
MyController
PersonDTO
Postman
HTTP POST Request
http://localhost:8080/AddPerson
{ "name": "John", "age": 20 }
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Create Project: springboot_dto_json_object_constructor (add Spring Boot Starters from the table)
Create Package: controllers (inside main package)
– Create Class: MyController.java (inside package controllers)
Create Package: DTO (inside main package)
– Create Class: PersonDTO.java (inside package controllers)
PersonDTO.java
package com.ivoronline.springboot_dto_json_object_constructor.DTO;
public class PersonDTO {
//PROPERTIES
//Not used for Deserialization if there is Constructor or Setters
private String name;
private Integer age;
//SETTERS
//Not used for Deserialization if there is Constructor
public String getName() { return name; }
public Integer getAge () { return age; }
//CONSTRUCTOR
//Used for Deserialization
PersonDTO(String name, Integer age) {
this.name = name;
this.age = age;
}
}
MyController.java
package com.ivoronline.springboot_dto_json_object_constructor.controllers;
import com.ivoronline.springboot_dto_json_object_constructor.DTO.PersonDTO;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class MyController {
@ResponseBody
@RequestMapping("/AddPerson")
public String addPerson(@RequestBody PersonDTO personDTO) {
//GET DATA FROM PersonDTO
String name = personDTO.getName();
Integer age = personDTO.getAge();
//RETURN SOMETHING
return name + " is " + age + " years old";
}
}
