https://www.cnblogs.com/nongzihong/p/11138909.html

spring-boot 项目中 全局配置 Date类型返回指定时间格式 如下:

# jackson时间格式化
spring.jackson.time-zone=GMT+8
spring.jackson.date-format=yyyy-MM-dd HH:mm:ss

　　

测试没有作用, 原因:

WebConfig implements WebMvcConfigurer 方式autoconfig失效

package com.richfun.boot.common.config;

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;

import com.richfun.boot.common.util.DateUtil;
import com.richfun.boot.common.util.UploadUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.text.SimpleDateFormat;
import java.util.List;

/**
 * WebMvc配置
 * @author geYang  2018-05-14
 */
@Configuration
public class WebConfig implements WebMvcConfigurer {

    /**
     * 使用此方法, 以下 spring-boot: jackson时间格式化 配置 将会失效
     * spring.jackson.time-zone=GMT+8
     * spring.jackson.date-format=yyyy-MM-dd HH:mm:ss
     * 原因: 会覆盖 @EnableAutoConfiguration 关于 WebMvcAutoConfiguration 的配置
     * */
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = converter.getObjectMapper();
        // 生成JSON时,将所有Long转换成String
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
        objectMapper.registerModule(simpleModule);
        // 时间格式化
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        objectMapper.setDateFormat(new SimpleDateFormat(DateUtil.PATTERN_TIME));
        // 设置格式化内容
        converter.setObjectMapper(objectMapper);
        converters.add(0, converter);
    }

}