并非所有内容类型都支持Spring REST Controller内容/类型

Question

我正在尝试创建使用HTML的Web服务，该HTML随后用于与iText创建PDF。

我使用Postman来将请求发送到服务器，但是无论选择哪种内容类型，每次遇到以下错误时，我都可以使用：

{
    "status": "CONFLICT",
    "code": 40902,
    "message": "Content type 'text/plain' not supported",
    "developerMessage": "null",
    "moreInfoUrl": "class org.springframework.web.HttpMediaTypeNotSupportedException",
    "throwable": null
}

消息根据所选内容类型而变化：

"message": "Content type 'text/xml' not supported"
"message": "Content type 'text/html' not supported"

这是我的终点：

@RequestMapping(path = "/reports/pdf", method = RequestMethod.POST, consumes = MediaType.TEXT_HTML_VALUE)
public ResponseEntity<byte[]> generatePdfReport(@RequestBody String html) throws Exception {
    byte[] pdfBytes = reportsService.generatePdf(html);
    ResponseEntity<byte[]> response = new ResponseEntity<byte[]>(pdfBytes, HttpStatus.OK);
    return response;
}

我已将consumes属性更改为：

• MediaType.TEXT_PLAIN_VALUE
• MediaType.TEXT_XML_VALUE

匹配我在Postman上发送的内容。

和@dnault注释一样，将其从RequestMapping注释中完全删除，结果相同。

我研究了类似的问题：

• 内容类型'text / plain; charset = UTF-8'在RestController类内的spring boot中不支持错误这是最接近我的问题的一种，但是我已经将请求中的内容类型设置为我期望的相同类型端点。
• 错误org.springframework.web.HttpMediaTypeNotSupportedException
• 错误：org.springframework.web.HttpMediaTypeNotSupportedException：内容类型'text / plain; charset = UTF-8'不支持

但是，以上所有内容以及与我检查过的问题确实不太接近的其他问题，都无法提供解决此问题的答案。

我尝试发送到服务器的示例HTML是：

<table style="border: 1px solid black; font-size: 12px; margin-top: 1px; width: 900px;" id="table_direction">
    <tr>
        <td width="33%" colspan="2">
            <strong>Data1</strong>
        </td>
        <td width="33%" colspan="2">
            <strongData2</strong>
        </td>
        <td width="16%" colspan="1">Foo</td>
        <td width="16%" colspan="1">Bar</td>
    </tr>
    <tr>
        <td colspan="">ID</td>
        <td colspan="">123456</td>
        <td colspan="">Property 1</td>
        <td colspan="">Foo</td>
        <td colspan="">Property 2</td>
        <td colspan="">Bar</td>
    </tr>
</table>

我们的配置由Java配置类完成，如下所示：

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.company.project")
@PropertySource("classpath:application.properties")

@EnableTransactionManagement // proxyTargetClass = true
@EnableJpaRepositories(basePackages = { "com.company.project.dao", "com.company.project.repository" })

public class HelloWorldConfiguration extends WebMvcConfigurerAdapter {

    @Inject
    Environment env;

    @Value("${jdbc.user}")
    private String userDB;

    @Value("${jdbc.password}")
    private String passDB;

    @Value("${jdbc.url}")
    private String urlDB;

    @Value("${jdbc.driverClassName}")
    private String driverClassName;

    @Bean
    public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
        return new PropertySourcesPlaceholderConfigurer();
    }

    @Bean
    public CommonsMultipartResolver multipartResolver() {
        return new CommonsMultipartResolver();
    }

    @Bean(name = "dataSource")
    public DriverManagerDataSource dataSource() {
        DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();
        driverManagerDataSource.setDriverClassName(driverClassName);
        driverManagerDataSource.setUrl(urlDB);
        driverManagerDataSource.setUsername(userDB);
        driverManagerDataSource.setPassword(passDB);
        return driverManagerDataSource;
    }

    @Bean
    public LocalSessionFactoryBean sessionFactory() {
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
        sessionFactory.setDataSource(dataSource());
        sessionFactory.setPackagesToScan(new String[] { "com.company.project.model" });
        sessionFactory.setHibernateProperties(hibernateProperties());
        return sessionFactory;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource,
            JpaVendorAdapter jpaVendorAdapter) {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(dataSource);
        entityManagerFactoryBean.setJpaVendorAdapter(jpaVendorAdapter);
        entityManagerFactoryBean.setPackagesToScan("com.company.project.model");
        entityManagerFactoryBean.setJpaProperties(hibernateProperties());
        return entityManagerFactoryBean;
    }

    private Properties hibernateProperties() {
        Properties jpaProperties = new Properties();
        jpaProperties.put("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
        jpaProperties.put("hibernate.show_sql", env.getProperty("hibernate.show_sql"));
        jpaProperties.put("hibernate.dialect", env.getProperty("hibernate.dialect"));
        return jpaProperties;
    }

    @Bean
    public PlatformTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }

    @Bean(name = "transactionManager2")
    @Autowired
    @Named("transactionManager2")
    public HibernateTransactionManager transactionManager2(SessionFactory s) {
        HibernateTransactionManager txManager = new HibernateTransactionManager();
        txManager.setSessionFactory(s);
        return txManager;
    }

    @Bean
    public JpaVendorAdapter jpaVendorAdapter() {
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setGenerateDdl(true);
        return vendorAdapter;
    }

    public MappingJackson2HttpMessageConverter jacksonMessageConverter(){
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();

        ObjectMapper mapper = new ObjectMapper();
        Hibernate5Module module = new Hibernate5Module();
        module.disable(Hibernate5Module.Feature.USE_TRANSIENT_ANNOTATION);

        mapper.registerModule(module);

        messageConverter.setObjectMapper(mapper);
        return messageConverter;

    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(jacksonMessageConverter());
        super.configureMessageConverters(converters);
    }
}

---

@ControllerAdvice
public class GenericRepositoryRestExceptionHandler extends RepositoryRestExceptionHandler {

    @Autowired
    public GenericRepositoryRestExceptionHandler(MessageSource messageSource) {
        super(messageSource);
        // TODO Auto-generated constructor stub
    }

    @ResponseBody
    @ExceptionHandler(Exception.class)
    ResponseEntity<?> handleException(Exception e) {
        //  return response(HttpStatus.CONFLICT, 40902, e.getMessage());
        return response(HttpStatus.CONFLICT, 40902, e.getMessage(), e.getCause() + "", e.getClass() + "");
    }

    private ResponseEntity<RestError> response(HttpStatus status, int code, String msg) {
        return response(status, code, msg, "", "");
    }

    private ResponseEntity<RestError> response(HttpStatus status, int code, String msg, String devMsg, String moreInfo) {
        return new ResponseEntity<>(new RestError(status, code, msg, devMsg, moreInfo, null), status);
    }

}

---

public class CORSFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        System.out.println("Filtering on...........................................................");

        SecurityContext ctx = SecurityContextHolder.getContext();
        HttpServletResponse response = (HttpServletResponse) res;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
        chain.doFilter(req, res);
    }

    public void init(FilterConfig filterConfig) {}

    public void destroy() {}

}

Answer 1

因为这

@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    converters.add(jacksonMessageConverter());
    super.configureMessageConverters(converters);
}

Spring MVC会跳过所有本应注册的默认转换器。（如果您好奇，可以在中完成WebMvcConfigurationSupport#getMessageConverters(..)。）

您的HttpMessageConverter，MappingJackson2HttpMessageConverter只能读取MediaType.APPLICATION_JSON内容，即。application/json。因此，所有其他请求内容类型将被拒绝。

您可以自己在configureMessageConverters覆盖中注册所有常规默认值（也可以只注册阅读HTML表单，XML，纯文本等所需的默认值）。

或者，您可以替代extendMessageConverters以查找默认MappingJackson2HttpMessageConverter实例并将其配置为使用您的custom ObjectMapper。例如，

public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
    ObjectMapper mapper = new ObjectMapper();
    // ...initialize...

    for (HttpMessageConverter<?> converter : converters) {
        if (converter instanceof MappingJackson2HttpMessageConverter) {
            MappingJackson2HttpMessageConverter m = (MappingJacksonHttpMessageConverter) converter;
            m.setObjectMapper(mapper);
        }
    } 
}

也许要发表关于依赖默认转换器列表的评论。