SpringBoot Rest Template

REST Template:

RestTemplate is a class in Spring framework that provides a convenient way to call RESTful APIs.
It is a high-level API that helps you interact with RESTful web services by converting HTTP requests and responses into Java objects.
It uses the Apache HttpClient under the hood to send HTTP requests.
You can use RestTemplate to make GET, POST, PUT, DELETE, and other HTTP requests.
It automatically converts JSON and XML responses into Java objects.
You can also set headers, add parameters, handle exceptions, and configure timeouts.
RestTemplate supports both synchronous and asynchronous execution.
RestTemplate is thread-safe, so you can reuse a single instance across multiple requests.
You can use RestTemplate with Spring MVC to provide RESTful services for your application.
RestTemplate can be easily integrated with other Spring modules such as Spring Security and Spring Retry.

Below is the code for a simple Spring Boot REST template example to retrieve a car data:

Car Entity Class (Car.java):

package com.example.demo.entity;

import lombok.Data;

@Data
public class Car {

    private int id;
    private String brand;
    private String model;
    private int year;
    private String color;

}

package com.example.demo.entity;

import lombok.Data;

@Data

public class Car {

private int id;

private String brand;

private String model;

private int year;

private String color;

}

Car Controller (CarController.java):

package com.example.demo.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import com.example.demo.entity.Car;

@RestController
public class CarController {

    @GetMapping("/cars/{id}")
    public Car getCar(@PathVariable int id) {
        RestTemplate restTemplate = new RestTemplate();
        Car car = restTemplate.getForObject("http://localhost:8080/cars/" + id, Car.class);
        return car;
    }

}

package com.example.demo.controller;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.client.RestTemplate;

import com.example.demo.entity.Car;

@RestController

public class CarController {

@GetMapping("/cars/{id}")

public Car getCar(@PathVariable int id) {

RestTemplate restTemplate = new RestTemplate();

Car car = restTemplate.getForObject("http://localhost:8080/cars/" + id, Car.class);

return car;

}

Main Application Class (SpringBootRestTemplateExampleApplication.java):

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootRestTemplateExampleApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootRestTemplateExampleApplication.class, args);
    }

}

package com.example.demo;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class SpringBootRestTemplateExampleApplication {

public static void main(String[] args) {

SpringApplication.run(SpringBootRestTemplateExampleApplication.class, args);

}

Application properties file (application.properties):

server.port=8080

1 2	server.port=8080

This is a simple example that uses the Spring Boot REST template to retrieve a car data based on the car id. You can run the application and test the endpoint by calling http://localhost:8080/cars/{id} in your web browser or a REST client like Postman.

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