SpringMVC消息转换器 对日期类型进行统一格式化

在配置类中扩展SpringMVC消息转换器对日期类型进行格式处理

• 对象转换器

  • package com.sky.json;
    
    import com.fasterxml.jackson.databind.DeserializationFeature;
    import com.fasterxml.jackson.databind.ObjectMapper;
    import com.fasterxml.jackson.databind.module.SimpleModule;
    import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
    import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
    import com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;
    import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
    import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
    import com.fasterxml.jackson.datatype.jsr310.ser.LocalTimeSerializer;
    
    import java.time.LocalDate;
    import java.time.LocalDateTime;
    import java.time.LocalTime;
    import java.time.format.DateTimeFormatter;
    
    import static com.fasterxml.jackson.databind.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES;
    
    /**
     * 对象映射器:基于jackson将Java对象转为json，或者将json转为Java对象
     * 将JSON解析为Java对象的过程称为 [从JSON反序列化Java对象]
     * 从Java对象生成JSON的过程称为 [序列化Java对象到JSON]
     */
    public class JacksonObjectMapper extends ObjectMapper {
    
        public static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";
        //public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
        public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm";
        public static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";
    
        public JacksonObjectMapper() {
            super();
            //收到未知属性时不报异常
            this.configure(FAIL_ON_UNKNOWN_PROPERTIES, false);
    
            //反序列化时，属性不存在的兼容处理
            this.getDeserializationConfig().withoutFeatures(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
    
            SimpleModule simpleModule = new SimpleModule()
                    .addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
                    .addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
                    .addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)))
                    .addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
                    .addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
                    .addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));
    
            //注册功能模块 例如，可以添加自定义序列化器和反序列化器
            this.registerModule(simpleModule);
        }
    }
    

• SpringMVC 框架的消息转换器

  • /**
         * 扩展Spring MVC框架的消息转化器
         * @param converters
         */
        protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
            log.info("扩展消息转换器...");
            //创建一个消息转换器对象
            MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
            //需要为消息转换器设置一个对象转换器，对象转换器可以将Java对象序列化为json数据
            converter.setObjectMapper(new JacksonObjectMapper());
            //将自己的消息转化器加入容器中
            converters.add(0,converter);
        }