关于Springboot日期时间格式化处理方式总结

2020-03-04 12:03:52于丽

使用Spring注解

使用spring自带注解@DateTimeFormat(pattern = "yyyy-MM-dd"),如下:

@DateTimeFormat(pattern = "yyyy-MM-dd")
private Date startDate;

如果使用了自定义参数转化器,Spring会优先使用该方式进行处理,即Spring注解不生效。

使用ControllerAdvice配合initBinder

@ControllerAdvice
public class GlobalExceptionHandler {

  @InitBinder
  protected void initBinder(WebDataBinder binder) {
    binder.registerCustomEditor(LocalDate.class, new PropertyEditorSupport() {
      @Override
      public void setAsText(String text) throws IllegalArgumentException {
        setValue(LocalDate.parse(text, DateTimeFormatter.ofPattern("yyyy-MM-dd")));
      }
    });
    binder.registerCustomEditor(LocalDateTime.class, new PropertyEditorSupport() {
      @Override
      public void setAsText(String text) throws IllegalArgumentException {
        setValue(LocalDateTime.parse(text, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
      }
    });
    binder.registerCustomEditor(LocalTime.class, new PropertyEditorSupport() {
      @Override
      public void setAsText(String text) throws IllegalArgumentException {
        setValue(LocalTime.parse(text, DateTimeFormatter.ofPattern("HH:mm:ss")));
      }
    });
  }
}

从名字就可以看出来,这是在controller做环切(这里面还可以全局异常捕获),在参数进入handler之前进行转换;转换为我们相应的对象。

JSON入参及返回值全局处理

请求类型为:post,content-type=application/json, 后台用@RequestBody接收,默认接收及返回值格式为: yyyy-MM-dd HH:mm:ss

修改 application.yml 文件

在application.propertities文件中增加如下内容:

spring:
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss
    time-zone: GMT+8
    支持(content-type=application/json)请求中格式为 yyyy-MM-dd HH:mm:ss的字符串,后台用@RequestBody接收,及返回值date转为yyyy-MM-dd HH:mm:ss格式string; 不支持(content-type=application/json)请求中yyyy-MM-dd等类型的字符串转为date; 不支持java8日期api;

利用Jackson的JSON序列化和反序列化

@Configuration
public class JacksonConfig {

  /** 默认日期时间格式 */
  public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
  /** 默认日期格式 */
  public static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";
  /** 默认时间格式 */
  public static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";

  @Bean
  public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
    MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
    ObjectMapper objectMapper = new ObjectMapper();

    // 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"));
    // 日期类型字符串处理
    objectMapper.setDateFormat(new SimpleDateFormat(DEFAULT_DATE_TIME_FORMAT));

    // java8日期日期处理
    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(javaTimeModule);

    converter.setObjectMapper(objectMapper);
    return converter;
  }
}