Spring接口接收参数转换器

Edited on In ,

前端向后端转换的类BootConverters

在 webMvc

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@Component
public class BootWebMvcConfigurer implements WebMvcConfigurer {

    @Override
    public void addFormatters(FormatterRegistry registry) {
        /*常用类型转换（前端传过来的转换之后使用）*/
        BootConverters.getConverterToRegister().forEach(registry::addConverter);
    }
}
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/**
 * 数据传输的格式转换
 *
 * @author maxzhao
 * @date 2020-03-05 14:14
 */
public class BootConverters {
    /**
     * 当前 JDK8+ 才有 java。time 包
     * <p>兼容JDK8以下</p>
     */
    private static final boolean JAVA_8_IS_PRESENT = ClassUtils.isPresent("java.time.LocalDateTime",
            Jsr310Converters.class.getClassLoader());

    public static Collection<Converter<?, ?>> getConverterToRegister() {
        if (!JAVA_8_IS_PRESENT) {
            return Collections.emptySet();
        }
        List<Converter<?, ?>> converters = new ArrayList<>();
        /*LocalDate 格式转换*/
        converters.add(LocalDateConverter.INSTANCE);
        /*LocalDateTime 格式转换*/
        converters.add(LocalDateTimeConverter.INSTANCE);
        /*String 格式转换*/
        converters.add(StringConverter.INSTANCE);
        return converters;
    }

    /**
     * LocalDate 格式转换
     * 这里枚举通过 INSTANCE 可以直接创建对象
     */
    enum LocalDateConverter implements Converter<String, LocalDate> {
        INSTANCE;

        @Override
        public LocalDate convert(String oldValue) {
            if (oldValue.isEmpty()) {
                return null;
            } else if (Pattern.matches(DateBootUtil.DEFAULT_DATE_REGEX, oldValue)) {
                return LocalDate.parse(oldValue, DateTimeFormatter.ofPattern(DateBootUtil.DEFAULT_DATE_FORMAT));
            } else if (Pattern.matches(DateBootUtil.DEFAULT_DATETIME_FORMAT, oldValue)) {
                return LocalDateTime.parse(oldValue, DateTimeFormatter.ofPattern(DateBootUtil.DEFAULT_DATETIME_FORMAT))
                        .toLocalDate();
            } else {
                return null;
            }
        }
    }

    enum LocalDateTimeConverter implements Converter<String, LocalDateTime> {
        INSTANCE;

        @Override
        public LocalDateTime convert(String oldValue) {
            if (oldValue.isEmpty()) {
                return null;
            } else if (Pattern.matches(DateBootUtil.DEFAULT_DATETIME_REGEX, oldValue)) {
                return LocalDateTime.parse(oldValue, DateTimeFormatter.ofPattern(DateBootUtil.DEFAULT_DATETIME_FORMAT));
            } else if (Pattern.matches(DateBootUtil.DEFAULT_DATE_REGEX, oldValue)) {
                return LocalDate.parse(oldValue, DateTimeFormatter.ofPattern(DateBootUtil.DEFAULT_DATE_FORMAT)).atStartOfDay();
            } else {
                return null;
            }
        }
    }

    enum StringConverter implements Converter<String, String> {
        INSTANCE;

        @Override
        public String convert(String oldValue) {
            if (oldValue.isEmpty()) {
                return null;
            } else if ("undefined".equals(oldValue)) {
                return null;
            } else {
                return oldValue;
            }
        }
    }
}

本文地址： https://github.com/maxzhao-it/blog/post/6a411b93/