后端回写前端日期格式化

问题

• 不进行格式化处理，就会导致传递的字符串很奇怪

解决方案

注解（字段）

<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.2</version>
</dependency>

    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")@ExcelProperty(value = "创建时间", index = 8)private LocalDateTime createTime;

转换器（全局）

定义序列化和反序列的转换器（目前只针对日期进行转换）

package com.sky.json;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);// 设置序列化和反序列化的日期格式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);}
}

在全局MVC配置中 加入刚才的配置 ，使用extendMessageConverters方法进行添加

package com.sky.config;
/*** 配置类，注册web层相关组件*/
@Configuration
@Slf4j
public class WebMvcConfiguration extends WebMvcConfigurationSupport {@Autowiredprivate JwtTokenAdminInterceptor jwtTokenAdminInterceptor;/*** 注册自定义拦截器** @param registry*/protected void addInterceptors(InterceptorRegistry registry) {log.info("开始注册自定义拦截器...");registry.addInterceptor(jwtTokenAdminInterceptor).addPathPatterns("/admin/**").excludePathPatterns("/admin/employee/login").excludePathPatterns("/admin/employee/download");}/*** 通过knife4j生成接口文档* @return*/@Beanpublic Docket docket() {ApiInfo apiInfo = new ApiInfoBuilder().title("苍穹外卖项目接口文档").version("2.0").description("苍穹外卖项目接口文档").build();Docket docket = new Docket(DocumentationType.SWAGGER_2).apiInfo(apiInfo).select().apis(RequestHandlerSelectors.basePackage("com.sky.controller")).paths(PathSelectors.any()).build();return docket;}/*** 设置静态资源映射* @param registry*/protected void addResourceHandlers(ResourceHandlerRegistry registry) {registry.addResourceHandler("/doc.html").addResourceLocations("classpath:/META-INF/resources/");registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");}/*** 扩展Spring mvc框架 的消息转换器* @param converters 转换器列表*/@Overrideprotected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {log.info("开始扩展Spring mvc框架的消息转换器...");// 创建自定义的消息转换器MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();converter.setObjectMapper(new JacksonObjectMapper());// 将自定义的消息转换器添加到转换器列表中 0表示添加到最前面 优先级最高converters.add(0,converter);}
}