spring - 已解决由 Handler 执行引起的异常 : org. springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/x-www-form

Question

我正在处理 Spring Boot MySQL 示例，链接如下: https://www.callicoder.com/spring-boot-rest-api-tutorial-with-mysql-jpa-hibernate/ 。尝试访问时我在 url 下方

2018-04-14 22:29:54.987 WARN 9572 --- [nio-8080-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved exception caused by Handler execution: org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported

笔记 Controller

@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>

Answer 1

API 接受 application/json 格式的请求主体，而不是 application/x-www-form-urlencoded 格式。

检查下面的屏幕截图-

您需要将请求主体作为 JSON 发送，并将 Content-Type 设置为 application/json，就像上面在 Postman 中一样。