Konfiguration der globalen Java-Datumstypkonvertierung

1. Warum benötigen Sie einen benutzerdefinierten Datumstypkonverter?

Der Controller empfängt die Client-Anforderungsparameter und die vom Client angeforderten Daten sind vom Typ String

Der Grund, warum wir den Empfang von Int- und Double-Typen verwenden können, liegt im internen Typkonverter des Frameworks

SpringMVC ist in Bezug auf die Zeittypkonvertierung nicht sehr gut, wir müssen die Typkonvertierung selbst manuell durchführen

2. Abhängigkeiten importieren

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-core</artifactId>
    <version>5.3.8</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

3. Kernkonfigurationsklasse

/**
 * @author zzw
 * @description TODO 自定义时间参数出入参转换类
 * @date 2022-11-15 17:29
 */
@Configuration
public class DateHandlerConfig {
    
    
    
	/**
     * 默认日期时间格式
     */
	private static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
	
    /**
     * 默认日期格式
     */
    private static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";
    
    /**
     * 默认时间格式
     */
    private static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";
    
    /**
     * Date转换器
     * 采用hutool的日期解析工具类Dateutil可以匹配任意格式日期字符串
     */
    @Bean
    public Converter<String, Date> dateConverter()
    	return new Converter<String, Date>() {
    
    
    		@Override
            public Date convert(String source) {
    
    
            	return DateUtil.parse(source.trim());
           	}
         };
    }
    
    /**
     * LocalDate转换器
     */
	@Bean
	public Converter<String, LocalDate> localDateConverter() {
    
    
  		return new Converter<String, LocalDate>() {
    
    
      		@Override
      		public LocalDate convert(String source) {
    
    
          		return LocalDate.parse(source, DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT));
      		}
  		};
  
	}
	
	/**
	 * LocalTime转换器
     */
  	@Bean
	public Converter<String, LocalTime> localTimeConverter() {
    
    
 		return new Converter<String, LocalTime>() {
    
    
      		@Override
      		public LocalTime convert(String source) {
    
    
          		return LocalTime.parse(source, DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT));
      		}
  		};
  	}
  	
  	/**
  	 *	LocalDateTime转换器
     */
	@Bean
  	public Converter<String, LocalDateTime> localDateTimeConverter() {
    
    
  		return new Converter<String, LocalDateTime>() {
    
    
      		@Override
   			public LocalDateTime convert(String source) {
    
    
          		return LocalDateTime.parse(source, DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT));
      		}
  		};
  
	}
	
	/**
  	 * Json序列化和反序列化转换器
     */
	@Bean
    public ObjectMapper objectMapper() {
    
    
		ObjectMapper objectMapper = new ObjectMapper();
        //java8日期 Local系列序列化和反序列化模块
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)));
        javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)));
        javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)));
        javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)));
        javaTimeModule.addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));
        
        objectMapper.registerModule(new ParameterNamesModule()).registerModule(new Jdk8Module()).registerModule(javaTimeModule);
        
        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        objectMapper.disable(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE);
        // 忽略json字符串中不识别的属性
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        // 忽略无法转换的对象
        objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        // PrettyPrinter 格式化输出
        objectMapper.configure(SerializationFeature.INDENT_OUTPUT, true);
        // NULL不参与序列化
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        // 指定时区
		objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
        /**
         * Date日期类型字符串全局处理, 默认格式为：yyyy-MM-dd HH:mm:ss
         * 局部处理某个Date属性字段接收或返回日期格式yyyy-MM-dd, 可采用@JsonFormat(pattern = "yyyy-MM-dd", timezone="GMT+8")注解标注该属性
  		 */
        objectMapper.setDateFormat(new SimpleDateFormat(DEFAULT_DATE_TIME_FORMAT));
		return objectMapper;
	}
}