graphql-spring-boot 上传二进制文件

Posted 2023-03-08

【中文标题】graphql-spring-boot 上传二进制文件

【英文标题】：graphql-spring-boot upload binary

【发布时间】：2018-06-11 13:00:04

【问题描述】：

我正在尝试将 GraphQL 突变和图像上传为应用程序/表单数据。 GraphQL 部分正在工作，但我想“保存”上传的二进制文件并将路径添加到 GraphQL 数据。在 createGraphQLContext 我可以访问 HttpServletRequest 但（多）部分是空的。 我使用带有嵌入式 tomcat 8.5 的 graphql-spring-boot-starter 和提供的 GraphQL Java Tools

这是我对 /graphql 的 Relay Modern 调用

------WebKitFormBoundaryWBzwQyVX0TvBTIBD
Content-Disposition: form-data; name="query"

mutation CreateProjectMutation(
  $input: ProjectInput!
) 
  createProject(input: $input) 
    id
    name
  


------WebKitFormBoundaryWBzwQyVX0TvBTIBD
Content-Disposition: form-data; name="variables"

"input":"name":"sdasas"
------WebKitFormBoundaryWBzwQyVX0TvBTIBD
Content-Disposition: form-data; name="file"; filename="51zvT5zy44L._SL500_AC_SS350_.jpg"
Content-Type: image/jpeg


------WebKitFormBoundaryWBzwQyVX0TvBTIBD--

在我的@Component public class MyGraphQLContextBuilder implements GraphQLContextBuilder 中，我可以访问HttpServletRequest，并希望使用req.getPart( "file" ) 访问该文件

但我在请求中的部分是空的 intellij debugger

我已将此添加到我的 application.yml

spring:
    http:
      multipart:
        enabled: true
        file-size-threshold: 10MB
        location: /tmp
        max-file-size: 10MB
        max-request-size: 15MB
        resolve-lazily: false

并尝试了不同的@configuration 来启用多部分配置，但部分仍然是空的。

@Configuration
public class MultipartConfig 

    @Bean
    public MultipartResolver multipartResolver() 
        StandardServletMultipartResolver resolver = new StandardServletMultipartResolver();
        return resolver;
    



import javax.servlet.MultipartConfigElement;
import javax.servlet.ServletRegistration.Dynamic;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class MyInitializer
        extends AbstractAnnotationConfigDispatcherServletInitializer 

    @Override
    protected Class<?>[] getRootConfigClasses() 
        return new Class[] ;
    

    @Override
    protected Class<?>[] getServletConfigClasses() 
        return new Class[]  MultipartConfig.class ;
    

    @Override
    protected String[] getServletMappings() 
        return new String[]  "/graphql" ;
    

    @Override
    protected void customizeRegistration(Dynamic registration) 

        //Parameters:-
        //   location - the directory location where files will be stored
        //   maxFileSize - the maximum size allowed for uploaded files
        //   maxRequestSize - the maximum size allowed for multipart/form-data requests
        //   fileSizeThreshold - the size threshold after which files will be written to disk
        MultipartConfigElement multipartConfig = new MultipartConfigElement("/tmp", 1048576,
                10485760, 0);
        registration.setMultipartConfig(multipartConfig);
    

我不知道该怎么做。希望有人可以帮助我。

谢谢。

【参考方案1】：

Spring boot 的嵌入式 Tomcat 默认支持 Servlet 3.x 多部分。 GraphQL java servlet 支持 commons FileUpload。要使事情正常工作，您必须禁用 Spring Boots 默认的多部分配置，例如：

在 pom.xml 中为 commons-fileupload 添加 maven 依赖

    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.3</version>
    </dependency>

Application.yml

spring:
    servlet:
      multipart:
         enabled: false

Spring Boot 应用类

@EnableAutoConfiguration(exclude=MultipartAutoConfiguration.class)

然后在你的@Configuration 中添加一个@Bean

@Bean(name = "multipartResolver")
public CommonsMultipartResolver multipartResolver() 
    CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
    multipartResolver.setMaxUploadSize(100000);
    return multipartResolver;

现在您可以在 GraphQL 上下文中找到上传的多部分文件，因为它们会自动映射到：

environment -> context -> files

可从 DataFetchingEnvironment

访问

以及突变的实现示例：

@Component
public class Mutation implements GraphQLMutationResolver 

    @Autowired
    private TokenService tokenService;

    @Autowired
    private UserRepository userRepository;

    @Autowired
    private UserService userService;

    @Autowired
    private ProjectRepository repository;

    @Autowired
    @Qualifier( value = "modeshape" )
    private StorageService storageService;

    @GraphQLField @GraphQLRelayMutation
    public ProjectItem createProject( CreateProjectInput input, DataFetchingEnvironment environment ) 
        Project project = new Project( input.getName() );
        project.setDescription( input.getDescription() );
        GraphQLContext context = environment.getContext();
        Optional<Map<String, List<FileItem>>> files = context.getFiles();
        files.ifPresent( keys -> 
            List<FileItem> file = keys.get( "file" );
            List<StorageService.FileInfo> storedFiles = file.stream().map( f -> storageService.store( f, "files", true ) ).collect( Collectors.toList() );
            project.setFile( storedFiles.get( 0 ).getUuid() );
         );
        repository.save( project );
        return new ProjectItem( project );
    
class CreateProjectInput 
    private String name;
    private String description;
    private String clientMutationId;

    @GraphQLField
    public String getName() 
        return name;
    

    public String getDescription() 
        return description;
    

    public void setDescription( String description ) 
        this.description = description;
    

    @GraphQLField
    public String getClientMutationId() 
        return clientMutationId;