1、Date与时间戳转换

1、实体类：
实体类中，时间类型字段使用Date 类型修饰。

public class User implements Serializable {    private static final long serialVersionUID = 621747518161198596L;    /     * 用户id     */    private String id;    /     * 用户名称     */    private String name;/     * 创建时间     */    private Date createTime;      /     * 更新时间     */    private Date updateTime;}

2、配置转换器：
目的是将,接收到前端时间戳,转换为Date类型.

public class TimeStampToDateConverter implements Converter<String, Date> {    @Override    public Date convert(String text) { Date date = null; if (StringUtils.isNotEmpty(text)) {     date = new Date(Long.parseLong(text)); } return date;    }}

3、注册转换器：
通过继承WebMvcConfigurationSupport类，重写addFormatters方法

@Configurationpublic class WebMvcRegistrationsConfig extends WebMvcConfigurationSupport {.../     * 添加自定义消息转换器     */    @Override    protected void addFormatters(FormatterRegistry registry) { // 添加时间戳转日期类型消息转换器 registry.addConverter(new TimeStampToDateConverter());    }...}

4、配置yaml：

spring:  #统一时间返回格式  jackson:    #date-format: yyyy-MM-dd HH:mm:ss #返回时间戳时不进行格式化    time-zone: GMT+8    serialization:      write-dates-as-timestamps: true #是否返回时间戳

2、LocalDateTime与时间戳转换

1、实体类：
实体类中，时间类型字段使用LocalDateTime类型修饰。

public class User implements Serializable {    private static final long serialVersionUID = 621747518161198596L;    /     * 用户id     */    private String id;    /     * 用户名称     */    private String name;/     * 创建时间     */    private LocalDateTimecreateTime;      /     * 更新时间     */    private LocalDateTimeupdateTime;}

2、配置转换器：

import com.fasterxml.jackson.core.JsonGenerator;import com.fasterxml.jackson.core.JsonParser;import com.fasterxml.jackson.databind.*;import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import java.io.IOException;import java.time.Instant;import java.time.LocalDateTime;import java.time.ZoneId;@Configurationpublic class LocalDateTimeSerializerConfig {    /     * 序列化LocalDateTime     *     * @return     */    @Bean    @Primary    public ObjectMapper serializingObjectMapper() { ObjectMapper objectMapper = new ObjectMapper(); JavaTimeModule javaTimeModule = new JavaTimeModule(); javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer()); javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer()); objectMapper.registerModule(javaTimeModule); return objectMapper;    }    /     * 序列化实现     */    public static class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> { @Override public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers)  throws IOException {     if (value != null) {  long timestamp = value.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();  gen.writeNumber(timestamp);     } }    }    /     * 反序列化实现     */    public static class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> { @Override public LocalDateTime deserialize(JsonParser p, DeserializationContext deserializationContext)  throws IOException {     long timestamp = p.getValueAsLong();     if (timestamp > 0) {  return LocalDateTime.ofInstant(Instant.ofEpochMilli(timestamp), ZoneId.systemDefault());     } else {  return null;     } }    }}

3、注册转换器：
通过继承WebMvcConfigurationSupport类，重写extendMessageConverters方法

@Configurationpublic class WebMvcRegistrationsConfig extends WebMvcConfigurationSupport {    // 注入ObjectMapper @Resource    private ObjectMapper serializingObjectMapper;.../     * 添加自定义消息转换器     */    @Override    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) { MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter(); converter.setObjectMapper(serializingObjectMapper); converters.add(0, converter);    }...}

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