Spring Boot full REST CRUD example

An alternative update returns ResponseEntity object.

@RestController
@RequestMapping("/fruits")
public class FruitController {

    private final Logger LOG = LoggerFactory.getLogger(FruitController.class);

    @Autowired
    private FruitService fruitService;

    @RequestMapping(method = RequestMethod.GET)
    public ResponseEntity<List<Fruit>> getAll(@RequestParam(value = "offset", defaultValue = "0") int index,
            @RequestParam(value = "numberOfRecord", defaultValue = "10") int numberOfRecord) {
        LOG.info("Getting all fruits with index: {}, and count: {}", index, numberOfRecord);
        List<Fruit> fruits = fruitService.getAll(index, numberOfRecord);

        if (fruits == null || fruits.isEmpty()) {
            return new ResponseEntity<List<Fruit>>(HttpStatus.NO_CONTENT);
        }

        return new ResponseEntity<List<Fruit>>(fruits, HttpStatus.OK);
    }

    @RequestMapping(value = "{id}", method = RequestMethod.GET)
    public ResponseEntity<Fruit> get(@PathVariable("id") int id) {
        LOG.info("Getting fruit with id: {}", id);
        Fruit fruit = fruitService.findById(id);

        if (fruit == null) {
            return new ResponseEntity<Fruit>(HttpStatus.NOT_FOUND);
        }

        return new ResponseEntity<Fruit>(fruit, HttpStatus.OK);
    }

    @RequestMapping(method = RequestMethod.POST)
    public ResponseEntity<Void> create(@RequestBody Fruit fruit, UriComponentsBuilder ucBuilder) {
        LOG.info("Creating fruit: {}", fruit);

        if (fruitService.exists(fruit)) {
            return new ResponseEntity<Void>(HttpStatus.CONFLICT);
        }

        fruitService.create(fruit);

        HttpHeaders headers = new HttpHeaders();
        headers.setLocation(ucBuilder.path("/fruit/{id}").buildAndExpand(fruit.getId()).toUri());
        return new ResponseEntity<Void>(headers, HttpStatus.CREATED);
    }

    @RequestMapping(value = "{id}", method = RequestMethod.PUT)
    public ResponseEntity<Fruit> update(@PathVariable int id, @RequestBody Fruit fruit) {
        LOG.info("Updating fruit: {}", fruit);
        Fruit currentFruit = fruitService.findById(id);

        if (currentFruit == null) {
            return new ResponseEntity<Fruit>(HttpStatus.NOT_FOUND);
        }

        currentFruit.setId(fruit.getId());
        currentFruit.setName(fruit.getName());

        fruitService.update(fruit);
        return new ResponseEntity<Fruit>(currentFruit, HttpStatus.OK);
    }

    @RequestMapping(value = "{id}", method = RequestMethod.DELETE)
    public ResponseEntity<Void> delete(@PathVariable("id") int id) {
        LOG.info("Deleting fruit with id: {}", id);
        Fruit fruit = fruitService.findById(id);

        if (fruit == null) {
            return new ResponseEntity<Void>(HttpStatus.NOT_FOUND);
        }

        fruitService.delete(id);
        return new ResponseEntity<Void>(HttpStatus.OK);
    }
}

From Spring MVC RESTFul Web Service CRUD Example

As you can see I have implemented two way to update. The first one will receive a json, and the second one will receive the cusotmerId in the URL and json also.

@RestController
@RequestMapping("/customer")
public class CustomerController {


    @RequestMapping(value = "/{id}", method = RequestMethod.GET)
    public Customer greetings(@PathVariable("id") Long id) {
        Customer customer = new Customer();
        customer.setName("Eddu");
        customer.setLastname("Melendez");
        return customer;
    }

    @RequestMapping(value = "/", method = RequestMethod.GET)
    public List<Customer> list() {
        return Collections.emptyList();
    }

    @RequestMapping(method = RequestMethod.POST)
    public void add(@RequestBody Customer customer) {

    }

    @RequestMapping(method = RequestMethod.PUT)
    public void update(@RequestBody Customer customer) {

    }

    @RequestMapping(value = "/{id}", method = RequestMethod.PUT)
    public void updateById(@PathVariable("id") Long id, @RequestBody Customer customer) {

    }

    @RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
    public void delete() {

    }

    class Customer implements Serializable {

        private String name;

        private String lastname;

        public String getName() {
            return name;
        }

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

        public void setLastname(String lastname) {
            this.lastname = lastname;
        }

        public String getLastname() {
            return lastname;
        }
    }
}

I have prepared a set of tutorials on Spring Boot CRUD Operations. Following are the content of tutorials:

1. How to create Spring Boot Project using Spring Tool Suite
2. How to implement GET & POST method in spring boot restful web service
3. How to implement PUT & DELETE method in spring boot restful web service
4. Integrate PostgreSQL database using spring boot JPA with spring boot restful web service
5. Use of CURL commands

Youtube Tutorials:

1. Spring Boot Restful Web Service Tutorial | Tutorial 1 - Introduction
2. Spring Boot Restful Web Services CRUD Example GET & POST | Tutorial - 2
3. Spring boot CRUD Operations example PUT & DELETE | Tutorial - 3
4. Spring Boot JPA | In 5 Simple Steps Integrate PostgreSQL Database | Tuorial - 4

Visit Blog for more details.