有兩種方式可以解決日期轉換Json問題：

1、（不推薦）區域性修改，自定義註解進行將日期型別轉換為Date型別。

2、（強烈推薦）全域性修改，用MappingJackson2HttpMessageConverter配置在XML（SpringMVC）或者配置在Application.Java啟動類（Spring boot、Spring cloud）。

配置在Application.Java啟動類（Spring boot、Spring cloud）：

@Bean
    public MappingJackson2HttpMessageConverter getMappingJackson2HttpMessageConverter() {
        MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter 
 
= new MappingJackson2HttpMessageConverter();
        //設定日期格式
        ObjectMapper objectMapper = new ObjectMapper();
        SimpleDateFormat smt = new SimpleDateFormat("yyyy-MM-dd");
        objectMapper.setDateFormat(smt);
        mappingJackson2HttpMessageConverter.setObjectMapper(objectMapper);
        
 
//設定中文編碼格式
        List<MediaType> list = new ArrayList<MediaType>();
        list.add(MediaType.APPLICATION_JSON_UTF8);
        mappingJackson2HttpMessageConverter.setSupportedMediaTypes(list);
        return mappingJackson2HttpMessageConverter;
    }

配置在XML（SpringMVC）：

<mvc:annotation-driven
 
>  
    <mvc:message-converters>  
        <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">  
            <property name="objectMapper" ref="customObjectMapper"/>
        </bean>  
    </mvc:message-converters>  
</mvc:annotation-driven> 

自定義objectMapper：

public class CustomObjectMapper extends ObjectMapper {    
    
    public CustomObjectMapper() {    
        CustomSerializerFactory factory = new CustomSerializerFactory();    
        factory.addGenericMapping(Date.class, new JsonSerializer<Date>() {    
            @Override    
            public void serialize(Date value, JsonGenerator jsonGenerator,    
                    SerializerProvider provider) throws IOException, JsonProcessingException {    
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    
                jsonGenerator.writeString(sdf.format(value));    
            }    
        });    
        this.setSerializerFactory(factory);    
    }    
}

注意：如果想要單個bean的某個日期欄位顯示年月日時分秒的話，只需要在對應日期的get方法上新增@JsonFormat(pattern="yyyy-MM-dd HH:mm:ss")即可。

轉 :https://my.oschina.net/u/3672057/blog/1844715