Question

我通过Postman测试了该应用程序并收到以下警告：

“ org.springframework.http.converter.HttpMessageNotWritableException：未找到类型为sun.nio.ch.ChannelInputStream的返回值的转换器”

也许有人知道如何解决此问题？

代码在下面显示

我的控制器

@RestController
public class FileServiceController {

private FileService fileService;

@Autowired
public FileServiceController(FileService fileService) {
    this.fileService = fileService;
}

@CrossOrigin
@RequestMapping(value = "/api/v1/write")
public ResponseEntity writeToFile(@RequestParam final String sessionId,  @RequestParam final String path) throws FileServiceException {
    return path != null ? new ResponseEntity<>(fileService.openForWriting(sessionId, path),
            HttpStatus.OK) : new ResponseEntity<>(HttpStatus.BAD_REQUEST);
}

@CrossOrigin
@RequestMapping(value = "/api/v1/files")
public ResponseEntity getFiles( @RequestParam final String sessionId, @RequestParam final String path) throws FileServiceException {
    return path != null ? new ResponseEntity<>(fileService.getFiles(sessionId, path), HttpStatus.FOUND) :
            new ResponseEntity<>(HttpStatus.NOT_FOUND);
}

@CrossOrigin
@RequestMapping(value = "/api/v1/read")
public ResponseEntity readFromFile(@RequestParam final String sessionId, @RequestParam final String path) throws FileServiceException {
    return path != null ? new ResponseEntity<>(fileService.openForReading(sessionId, path), HttpStatus.FOUND) :
            new ResponseEntity<>(HttpStatus.NOT_FOUND);
}

@CrossOrigin
@RequestMapping(value = "/api/v1/delete")
public ResponseEntity deleteFromFile(@RequestParam final String sessionId, @RequestParam final String path) throws FileServiceException {
    return path != null ? new ResponseEntity<>(fileService.delete(sessionId, path), HttpStatus.OK) :
            new ResponseEntity<>(HttpStatus.BAD_REQUEST);
}

}

我的FileServiceImpl

@Service
public class FileServiceImpl implements FileService {

@Override
public OutputStream openForWriting(final String sessionId, final String path) throws FileServiceException {
    try {
        return Files.newOutputStream(Paths.get(path), StandardOpenOption.APPEND);
    } catch (final IOException e) {
        throw new FileServiceException("cannot open entry", e);
    }
}

@Override
public InputStream openForReading(final String sessionId, final String path) throws FileServiceException {
    try {
        return Files.newInputStream(Paths.get(path));
    } catch (final IOException e) {
        throw new FileServiceException("cannot open entry", e);
    }
}

@Override
public List<String> getFiles(final String sessionId, final String path) throws FileServiceException {
    try (Stream<Path> paths = Files.walk(Paths.get(path))) {
        return paths.filter(Files::isRegularFile)
                .map(Path::toString)
                .collect(Collectors.toList());
    } catch (IOException e) {
        throw new FileServiceException("cannot get files", e);
    }
}

@Override
public boolean delete(final String sessionId, final String path) throws FileServiceException {
    Path rootPath = Paths.get(path);
    try {
        Files.walk(rootPath)
                .sorted(Comparator.reverseOrder())
                .map(Path::toFile)
                .forEach(File::delete);
    } catch (IOException e) {
        throw new FileServiceException("cannot delete entries", e);
    }
    return true;
    }
}

接口

public interface FileService {

@NotNull OutputStream openForWriting(@NotNull final String sessionId, final String path) throws FileServiceException;

@NotNull InputStream openForReading(@NotNull final String sessionId, final String path) throws FileServiceException;

@NotNull List<String> getFiles(@NotNull final String sessionId, final String path) throws FileServiceException;

boolean delete(@NotNull final String sessionId, final String path) throws FileServiceException;

}

应用

@SpringBootApplication
public class FileServiceApplication {

public static void main(final String[] args) {
    SpringApplication.run(FileServiceApplication.class, args);
}

}

Answer 1

FileServiceImpl.openForReading()返回一个InputStream，这就是您在FileServiceController.readFromFile()中输入的内容。 InputStream不可序列化，因此是例外。

您应该放置从其中读取的内容而不是InputStream，例如byte[]，字符串或应用程序要处理的任何对象。

org.springframework.http.converter.HttpMessageNotWritableException：未找到类型为sun.nio.ch.ChannelInputStream的返回值的转换器

1 个答案: