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This tutorial shows how to
● Deserialize HTTP Request Parameters into Map<String, Object> (how to automatically load them into Map)
● use ObjectMapper to load that Map into PersonDTO
● use setters() to customize values that go into PersonDTO Properties (converting "1,67" into "1.67")
Application Schema [Results]
Spring Boot Starters
GROUP
DEPENDENCY
DESCRIPTION
Web
Spring Web
Enables: Controller Annotations, Tomcat Server
PersonDTO
http://localhost:8080/AddPerson
Tomcat
addPerson()
Browser
MyController
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Create Project: springboot_deserialize_requestparameters_objectmapper (add Spring Boot Starters from the table)
Create Package: DTO (inside main package)
– Create Class: PersonDTO.java (inside package DTO)
Create Package: controllers (inside main package)
– Create Class: MyController.java (inside package controllers)
PersonDTO.java
package com.ivoronline.springboot_deserialize_requestparameters_objectmapper.DTO;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
@JsonIgnoreProperties(ignoreUnknown = true) //To avoid Error if Request contains additional Parameters
public class PersonDTO {
//PROPERTIES
public String name;
public Float height;
//CONVERSION SETTER
@JsonProperty("height") //Map Request Parameter to Setter
public void setHeight(String heightString) {
heightString = heightString.replace(',', '.');
this.height = Float.parseFloat(heightString);
}
}
MyController.java
package com.ivoronline.springboot_deserialize_requestparameters_objectmapper.controllers;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.ivoronline.springboot_deserialize_requestparameters_objectmapper.DTO.PersonDTO;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.Map;
@Controller
public class MyController {
@ResponseBody
@RequestMapping("/AddPerson")
public String addPerson(@RequestParam Map<String, Object> requestParameters) {
PersonDTO personDTO = new ObjectMapper().convertValue(requestParameters, PersonDTO.class);
return personDTO.name + " is " + personDTO.height + " meters high";
}
}
