我正在做Sping Boot MySQL示例如下链接：https://www.callicoder.com/spring-boot-rest-api-tutorial-with-mysql-jpa-hibernate/。我得到下面的网址时，试图访问
2018-04-14 22：29：54.987 WARN 9572 --- [nio-8080-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver：已解决处理程序执行导致的异常：org.springframework.web.HttpMediaTypeNotSupportedException：内容类型'application/x-www-form-urlencoded; charset=UTF-8'不支持

NoteController

@RestController
@RequestMapping("/api")
public class NoteController {

    @Autowired
    private NoteRepository noteRepository;

    @GetMapping("/notes")
    public List<Note> getAllNotes(){
        return noteRepository.findAll();
    }

    @PostMapping("/notes")
    public Note createNote(@Valid @RequestBody Note note){
        return noteRepository.save(note);
    }

    @GetMapping("/notes/{id}")
    public Note getNoteById(@PathVariable(value = "id") Long noteId){
        return noteRepository.findById(noteId)
                .orElseThrow(() -> new ResourceNotFoundException("Note", "id", noteId));
    }

    @PutMapping("/notes/{id}")
    public Note updateNote(@PathVariable(value = "id") Long noteId,
                            @Valid @RequestBody Note noteDetails){

        Note note = noteRepository.findById(noteId)
                .orElseThrow(() -> new ResourceNotFoundException("Note", "id", noteId));

        note.setTitle(noteDetails.getTitle());
        note.setContent(noteDetails.getContent());

        Note updatedNote = noteRepository.save(note);
        return updatedNote;
    }

    @DeleteMapping("/notes/{id}")
    public ResponseEntity<?> deleteNote(@PathVariable(value="id") Long noteId){
        Note note = noteRepository.findById(noteId)
                .orElseThrow(() -> new ResourceNotFoundException("Note", "id", noteId));

        noteRepository.delete(note);

        return ResponseEntity.ok().build();
    }
}

pom.xml

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>