BAEL 2730 (#6524)

* BAEL 2730

* jackson-dataformat-xml uncommented

spring-boot-rest/src/main/java/com/baeldung/web/controller/students/Student.java

@@ -0,0 +1,53 @@
+package com.baeldung.web.controller.students;
+
+public class Student {
+    
+    private long id;
+    private String firstName;
+    private String lastName;
+    
+    public Student() {}
+    
+    public Student(String firstName, String lastName) {
+        super();
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+    
+    public Student(long id, String firstName, String lastName) {
+        super();
+        this.id = id;
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    @Override
+    public String toString() {
+        return "Student [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + "]";
+    }
+
+}

spring-boot-rest/src/main/java/com/baeldung/web/controller/students/StudentController.java

@@ -0,0 +1,73 @@
+package com.baeldung.web.controller.students;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
+import com.baeldung.web.controller.students.StudentService;
+
+@RestController
+@RequestMapping("/students")
+public class StudentController {
+
+    @Autowired
+    private StudentService service;
+
+    @GetMapping("/")
+    public List<Student> read() {
+        return service.readAll();
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<Student> read(@PathVariable("id") Long id) {
+        Student foundStudent = service.read(id);
+        if (foundStudent == null) {
+            return ResponseEntity.notFound().build();
+        } else {
+            return ResponseEntity.ok(foundStudent);
+        }
+    }
+
+    @PostMapping("/")
+    public ResponseEntity<Student> create(@RequestBody Student student) throws URISyntaxException {
+        Student createdStudent = service.create(student);
+
+        URI uri = ServletUriComponentsBuilder.fromCurrentRequest()
+            .path("/{id}")
+            .buildAndExpand(createdStudent.getId())
+            .toUri();
+
+        return ResponseEntity.created(uri)
+            .body(createdStudent);
+
+    }
+
+    @PutMapping("/{id}")
+    public ResponseEntity<Student> update(@RequestBody Student student, @PathVariable Long id) {
+        Student updatedStudent = service.update(id, student);
+        if (updatedStudent == null) {
+            return ResponseEntity.notFound().build();
+        } else {
+            return ResponseEntity.ok(updatedStudent);
+        }
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Object> deleteStudent(@PathVariable Long id) {
+        service.delete(id);
+
+        return ResponseEntity.noContent().build();
+    }
+
+}

spring-boot-rest/src/main/java/com/baeldung/web/controller/students/StudentService.java

@@ -0,0 +1,51 @@
+package com.baeldung.web.controller.students;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class StudentService {
+    
+    // DB repository mock
+    private Map<Long, Student> repository = Arrays.asList(
+        new Student[]{
+                new Student(1, "Alan","Turing"),
+                new Student(2, "Sebastian","Bach"),
+                new Student(3, "Pablo","Picasso"),
+        }).stream()
+        .collect(Collectors.toConcurrentMap(s -> s.getId(), Function.identity()));
+    
+    // DB id sequence mock
+    private AtomicLong sequence = new AtomicLong(3);
+    
+    public List<Student> readAll() {
+        return repository.values().stream().collect(Collectors.toList());
+    }
+    
+    public Student read(Long id) {
+        return repository.get(id);
+    }
+
+    public Student create(Student student) {
+        long key = sequence.incrementAndGet();
+        student.setId(key);
+        repository.put(key, student);
+        return student;
+    }
+    
+    public Student update(Long id, Student student) {
+        student.setId(id);
+        Student oldStudent = repository.replace(id, student);
+        return oldStudent == null ? null : student;
+    }
+    
+    public void delete(Long id) {
+        repository.remove(id);
+    }
+}

spring-boot-rest/src/test/java/com/baeldung/web/StudentControllerIntegrationTest.java

@@ -0,0 +1,76 @@
+package com.baeldung.web;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.web.server.MediaTypeNotSupportedStatusException;
+
+import com.baeldung.web.controller.students.Student;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@AutoConfigureMockMvc
+public class StudentControllerIntegrationTest {
+
+    private static final String STUDENTS_PATH = "/students/";
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    public void whenReadAll_thenStatusIsOk() throws Exception {
+        this.mockMvc.perform(get(STUDENTS_PATH))
+            .andExpect(status().isOk());
+    }
+
+    @Test
+    public void whenReadOne_thenStatusIsOk() throws Exception {
+        this.mockMvc.perform(get(STUDENTS_PATH + 1))
+            .andExpect(status().isOk());
+    }
+
+    @Test
+    public void whenCreate_thenStatusIsCreated() throws Exception {
+        Student student = new Student(10, "Albert", "Einstein");
+        this.mockMvc.perform(post(STUDENTS_PATH).content(asJsonString(student))
+            .contentType(MediaType.APPLICATION_JSON_VALUE))
+            .andExpect(status().isCreated());
+    }
+
+    @Test
+    public void whenUpdate_thenStatusIsOk() throws Exception {
+        Student student = new Student(1, "Nikola", "Tesla");
+        this.mockMvc.perform(put(STUDENTS_PATH + 1)
+            .content(asJsonString(student))
+            .contentType(MediaType.APPLICATION_JSON_VALUE))
+            .andExpect(status().isOk());
+    }
+    
+    @Test
+    public void whenDelete_thenStatusIsNoContent() throws Exception {
+        this.mockMvc.perform(delete(STUDENTS_PATH + 3))
+            .andExpect(status().isNoContent());
+    }
+
+    private String asJsonString(final Object obj) {
+        try {
+            return new ObjectMapper().writeValueAsString(obj);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}