SpringBoot Sample Rest Service and Rest Client Code

1. SpringWebApplication.java

package com.raj.springweb;

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

@SpringBootApplication
public class SpringwebApplication {

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

}

2. Simple HelloWorld Rest service Example.

package com.raj.springweb.controllers;

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

@RestController
public class RestHelloWorldController {
   
   
    @RequestMapping (value="/helloapi/helloworld", method=RequestMethod.GET)
    public String helloworld () {
        return new String("Hello World");
    }

}


3. Product Service example, which needs below set of files to be created as well.

package com.raj.springweb.controllers;

import java.util.List;
import javax.websocket.server.PathParam;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.raj.springweb.model.Product;
import com.raj.springweb.repos.ProductJpaRepository;

@RestController
public class RestProductController {
   
    @Autowired
    ProductJpaRepository productRepo;
   
    @RequestMapping (value="/productapi/allproducts", method=RequestMethod.GET)
    public List findAllProducts () {
        return productRepo.findAll();
    }
   
    @RequestMapping (value="/productapi/product/byId/{id}", method=RequestMethod.GET)
    public Product findProductbyId (@PathVariable("id") long id) {
        return productRepo.findById(id).get();
    }
       
    @RequestMapping (value="/productapi/createproduct", method=RequestMethod.POST)
    public Product createProduct (@RequestBody Product product) {
        return productRepo.save(product);
    }
   
    @RequestMapping (value="/productapi/updateproduct", method=RequestMethod.PUT)
    public Product updateProduct (@RequestBody Product product) {
        return productRepo.save(product);
    }
   
    @RequestMapping (value="/productapi/deleteproduct/byId/{id}", method=RequestMethod.DELETE)
    public void deleteProduct (@PathVariable long id) {
        productRepo.deleteById(id);
    }
   
}

4. Entity class Product with auto-generated primarykey (ID)
 
package com.raj.springweb.model;

import java.math.BigDecimal;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Product {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    long id;
   
    String name;
   
    String description;
   
    BigDecimal price;
   

    public long getId() {
        return id;
    }

    public String getName() {
        return name;
    }

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

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public BigDecimal getPrice() {
        return price;
    }

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

5. Repository Interface

package com.raj.springweb.repos;
import org.springframework.data.jpa.repository.JpaRepository;
import com.raj.springweb.model.Product;

public interface ProductJpaRepository extends JpaRepository {

}

6. Test class with Rest Client

package com.raj.springweb;

import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.web.client.RestTemplate;
import com.raj.springweb.model.Product;
import static org.junit.Assert.*;
import java.math.BigDecimal;
import org.junit.Test;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringwebApplicationTests {

    @Test
    public void testGetProduct() {
        RestTemplate restTemplate = new RestTemplate();
        Product product = restTemplate.getForObject("http://localhost:8080/service/productapi/product/byId/4", Product.class);
        assertNotNull(product);
        assertEquals("prod4", product.getName());
    }

   
    @Test
    public void testPostProduct() {
        RestTemplate restTemplate = new RestTemplate();
        Product product = new Product();
        product.setName("prod5");
        product.setDescription("Product Five");
        product.setPrice(BigDecimal.valueOf(12.50));
       
        Product newProd = restTemplate.postForObject("http://localhost:8080/service/productapi/createproduct", product, Product.class);
        assertNotNull(newProd);
        assertEquals("prod5", newProd.getName());
    }
   
 }
          

7. application.xml

server.servlet.context-path=/service/

spring.datasource.url=jdbc:mysql://localhost:3306/springboottestdb
spring.datasource.username=root
spring.datasource.password=password
 
8. POM.xml