Question

第一实体：

@Entity
@Table(name = "PIL_P_DOMAINE")
public class PIL_P_DOMAINE {

    @NotBlank
    @Column(nullable = false, unique = true, name = "DOMAINE_ID")
    private String DOMAINE_ID;

    @NotBlank
    @Column(nullable = false, name = "DOMAINE_DS")
    private String DOMAINE_DS;

    public PIL_P_DOMAINE() {
    }

}

第二实体：

@Entity
        public class PIL_P_DOMAINE_TABLE {

            @NotBlank
            @JoinColumn(nullable = false, name = "DOMAINE_ID")
            @ManyToOne
            private PIL_P_DOMAINE DOMAINE_ID;

            @NotBlank
            @Column(nullable = false, name = "DATABASE_NM")
            private String DATABASE_NM;

            @NotBlank
            @Column(nullable = false, name = "TABLE_NM")
            private String TABLE_NM;

            @Column(name = "APPLCTN_COLNM_NM")
            private String APPLCTN_COLNM_NM;

            @Column(name = "CRITERE_FILTRE_NM")
            private String CRITERE_FILTRE_NM;

            public PIL_P_DOMAINE_TABLE() {
            }
    }

转换器：

@Component("domaineToDomTabConverter")
public class DomaineToDomTabConverter implements Converter<Object, PIL_P_DOMAINE> {

    static final Logger logger = LoggerFactory.getLogger(DomaineToDomTabConverter.class);

    @Autowired
    @Qualifier("pIL_P_DOMAINE_SERVICE")
    IService<PIL_P_DOMAINE> domService;

    /**
     * 
     * 
     * @see org.springframework.core.convert.converter.Converter#convert(java.lang.Object)
     */
    public PIL_P_DOMAINE convert(Object element) {
        Integer id = Integer.parseInt((String) element);
        PIL_P_DOMAINE dom = domService.findById(id);
        logger.info("Domaine : {}", dom);
        return dom;
    }
}

的AppConfig：

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.fussa.fyby")
public class AppConfig extends WebMvcConfigurerAdapter {


    @Autowired
    DomaineToDomTabConverter domaineToDomTabConverter;

    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setViewClass(JstlView.class);
        viewResolver.setPrefix("/WEB-INF/views/");
        viewResolver.setSuffix(".jsp");
        return viewResolver;
    }


    @Override
    public void addFormatters(FormatterRegistry registry) {
        registry.addConverter(domaineToDomTabConverter);
    }

    @Bean
    public MessageSource messageSource() {
        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
        messageSource.setBasename("messages");
        return messageSource;
    }


    @Override
    public void configurePathMatch(PathMatchConfigurer matcher) {
        matcher.setUseRegisteredSuffixPatternMatch(true);
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
    }

}

当我尝试保留 PIL_P_DOMAINE 对象时，添加

@Override
        public void addFormatters(FormatterRegistry registry) {
            registry.addConverter(domaineToDomTabConverter);
        }

到我的 AppConfig 类，对象是持久化的（y）。我遇到的问题是，当我想要持久保存包含对象 PIL_P_DOMAINE 的PIL_P_DOMAINE_TABLE对象时，我添加了 DomaineToDomTabConverter 以转换为字符串我将获得表单中的对象，所以我在我的 AppCongig 类中添加了转换器，由于这些修改我不能保留 PIL_P_DOMAINE 对象，我收到此错误：

警告： org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - 无法绑定请求元素：org.springframework.beans.TypeMismatchException：转换失败 [com.fussa.fyby.model.PIL_P_DOMAINE]类型的值为必需类型 [com.fussa.fyby.model.PIL_P_DOMAINE];嵌套异常是 org.springframework。 core.convert.ConversionFailedException：失败从类型[com.fussa.fyby.model.PIL_P_DOMAINE]转换为类型 [@javax.validation.Valid @ org.springframework.web.bi nd.annotation.ModelAttribute com.fussa.fyby.model.PIL_P_DOMAINE] for value'com.fussa.fyby.model.PIL_P_DOMAINE@716898c0';嵌套异常是java.lang.ClassCastExce ption：com.fussa.fyby.model.PIL_P_DOMAINE 无法强制转换为java.lang.String

如果我想要保留第二个实体而不是第一个实体，我怎样才能调用转换器？

感谢您的任何建议..

Answer 1

通过参数化类型i转换为字符串而不是对象

来解决此问题

@Component("domaineToDomTabConverter")
public class DomaineToDomTabConverter implements Converter<String, PIL_P_DOMAINE> {    

    public PIL_P_DOMAINE convert(Stringelement) {
        //
    }
}

错误请求：org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - 无法绑定请求元素

1 个答案: