BAEL-4842 - Use React and Spring Boot to Build a Simple CRUD App

Initial source module for the article

spring-boot-modules/spring-boot-react/src/main/java/com/baeldung/springbootreact/controller/ClientsController.java

@@ -0,0 +1,54 @@
+package com.baeldung.springbootreact.controller;
+
+import com.baeldung.springbootreact.domain.Client;
+import com.baeldung.springbootreact.repository.ClientRepository;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.List;
+
+@RestController
+@RequestMapping("/clients")
+public class ClientsController {
+
+    private final ClientRepository clientRepository;
+
+    public ClientsController(ClientRepository clientRepository) {
+        this.clientRepository = clientRepository;
+    }
+
+    @GetMapping
+    public List getClients() {
+        return clientRepository.findAll();
+    }
+
+    @GetMapping("/{id}")
+    public Client getClient(@PathVariable Long id) {
+        return clientRepository.findById(id).orElseThrow(RuntimeException::new);
+    }
+
+    @PostMapping
+    public ResponseEntity createClient(@RequestBody Client client) throws URISyntaxException {
+        Client savedClient = clientRepository.save(client);
+        return ResponseEntity.created(new URI("/clients/" + savedClient.getId())).body(savedClient);
+    }
+
+    @PutMapping("{id}")
+    public ResponseEntity updateClient(@PathVariable Long id, @RequestBody Client client) {
+        Client currentClient = clientRepository.findById(id).orElseThrow(RuntimeException::new);
+        currentClient.setName(client.getName());
+        currentClient.setEmail(client.getEmail());
+        currentClient = clientRepository.save(client);
+
+        return ResponseEntity.ok(currentClient);
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity deleteClient(@PathVariable Long id) {
+        clientRepository.deleteById(id);
+        return ResponseEntity.ok().build();
+    }
+
+}