Springboot中日期类型参数：转换处理

拼搏现实的明天。 2024-03-31 15:16 59阅读 0赞

**目录**

前言

常用的日期类型

完成目标

具体实现方法

日期格式转换器配置

接收参数对象配置

controller层方法接收参数

springboot版本

--------------------

## 前言 ##

在实际使用Spring MVC开发java web项目的过程中，前端调用后端的接口时，通常是以json报文的格式传递到后台，spring会对抆参数进行解析最后映射到controller层方法中。而日期类型参数前端传递过来通常是yyyy-MM-dd或yyyy-MMdd HH:mm:ss格式的字符串，而接收参数的对象中往往是LocalDate、LocalDateTime、Date，映射的时候经常会出现异常报错，这篇文章用一个小例子来分享遇到这种情况是应该是如何解决？

## 常用的日期类型 ##

java.time.LocalDate;

java.time.LocalDateTime;

java.util.Date;

## 完成目标 ##

1.  前台传递到后台一个字符类型的日期（yyyy-MM-dd），后台使用LocalDate来接收，并且返回值中格式与传入相同。
2.  前台传递到后台一个字符类型的日期时间（yyyy-MM-dd HH:mm:ss），后台怎么使用LocalDateTime来接收，并且返回值中格式与传入相同。
3.  前台传递到后台一个字符类型的日期时间（yyyy-MM-dd HH:mm:ss），后台怎么使用java.util.Date来接收，并且返回值中格式与传入相同。

## 具体实现方法 ##

1、java.util.Date类型的日期的类型转移与格式化使用@JsonFormat即可解决；对于LocalDate与LocalDateTime类型的需要全局配置自定义类型转换器;

2、对于LoclDateTime类型的参数，在序列化与反序列化的时候会有异常，通过Jackson2ObjectMapperBuilderCustomizer自定义一下LocalDate和LocalDateTime两种类型的序列化处理器即可解决这个异常；

JSON parse error: Cannot deserialize value of type `java.time.LocalDateTime` 
    Failed to deserialize java.time.LocalDateTime 
    nested exception is com.fasterxml.jackson.databind.exc.InvalidFormatException:
     Cannot deserialize value of type `java.time.LocalDateTime`

### 日期格式转换器配置 ###

@Configuration
    public class DateConverterConfig {
    
        @Bean
        public Converter<String, LocalDate> LocalDateConverter() {
            return new Converter<String, LocalDate>() {
                @Override
                public LocalDate convert(String source) {
                    return LocalDate.parse(source, DateTimeFormatter.ofPattern("yyyy-MM-dd"));
    
                }
            };
        }
    
        @Bean
        public Converter<String, LocalDateTime> LocalDateTimeConverter() {
            return new Converter<String, LocalDateTime>() {
                @Override
                public LocalDateTime convert(String source) {
                    return LocalDateTime.parse(source, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
    
                }
            };
        }
    
        @Bean
        public Jackson2ObjectMapperBuilderCustomizer jsonCustomizer() {
            JavaTimeModule module = new JavaTimeModule();
            LocalDateTimeDeserializer localDateTimeDeserializer = new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
            module.addDeserializer(LocalDateTime.class, localDateTimeDeserializer);
            return new Jackson2ObjectMapperBuilderCustomizer() {
                @Override
                public void customize(Jackson2ObjectMapperBuilder builder) {
                    builder.simpleDateFormat("yyyy-MM-dd HH:mm:ss");
                    builder.serializers(new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
                    builder.serializers(new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
                    builder.modules(module);
                }
            };
    
        }
    }

### 接收参数对象配置 ###

@Data
    public class Person implements Serializable {
    
        private String perName;
    
        private LocalDate born;
    
        private LocalDateTime loginTime;
    
        @JsonFormat(pattern = "yyyy-MM-dd")
        private Date date1;
        @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
        private Date date2;
        private List<LocalDate> localDates;
        private List<LocalDateTime> localDateTimes;
        @JsonFormat(pattern = "yyyy-MM-dd")
        private List<Date> dates;
        @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
        private List<Date> dateTimes;
    }

### controller层方法接收参数 ###

@PostMapping("/conTest")
        public Person conTest(@RequestBody Person person){
            System.out.println("姓名:"+person.getPerName());
    
            return person;
        }

### springboot版本 ###

springboot:2.3.9.RELEASE

> Springboot扩展点系列实现方式、工作原理集合：
> 
> [Springboot扩展点之ApplicationContextInitializer][Springboot_ApplicationContextInitializer]
> 
> [Springboot扩展点之BeanDefinitionRegistryPostProcessor][Springboot_BeanDefinitionRegistryPostProcessor]
> 
> [Springboot扩展点之BeanFactoryPostProcessor][Springboot_BeanFactoryPostProcessor]
> 
> [Springboot扩展点之BeanPostProcessor][Springboot_BeanPostProcessor]
> 
> [Springboot扩展点之InstantiationAwareBeanPostProcessor][Springboot_InstantiationAwareBeanPostProcessor]
> 
> [Springboot扩展点之SmartInstantiationAwareBeanPostProcessor][Springboot_SmartInstantiationAwareBeanPostProcessor]
> 
> [Springboot扩展点之ApplicationContextAwareProcessor][Springboot_ApplicationContextAwareProcessor]
> 
> [Springboot扩展点之@PostConstruct][Springboot_PostConstruct]
> 
> [Springboot扩展点之InitializingBean][Springboot_InitializingBean]
> 
> [Springboot扩展点之DisposableBean][Springboot_DisposableBean]
> 
> [Springboot扩展点之SmartInitializingSingleton][Springboot_SmartInitializingSingleton]
> 
> Springboot核心功能工作原理：
> 
> [Springboot实现调度任务的工作原理][Springboot]
> 
> [Springboot事件监听机制的工作原理][Springboot 1]

[Springboot_ApplicationContextInitializer]: https://blog.csdn.net/fox9916/article/details/128522598
[Springboot_BeanDefinitionRegistryPostProcessor]: https://blog.csdn.net/fox9916/article/details/128538625
[Springboot_BeanFactoryPostProcessor]: https://blog.csdn.net/fox9916/article/details/128823328
[Springboot_BeanPostProcessor]: https://blog.csdn.net/fox9916/article/details/128917992
[Springboot_InstantiationAwareBeanPostProcessor]: https://blog.csdn.net/fox9916/article/details/128941464
[Springboot_SmartInstantiationAwareBeanPostProcessor]: https://blog.csdn.net/fox9916/article/details/128976944
[Springboot_ApplicationContextAwareProcessor]: https://blog.csdn.net/fox9916/article/details/128990305
[Springboot_PostConstruct]: https://blog.csdn.net/fox9916/article/details/128998846
[Springboot_InitializingBean]: https://blog.csdn.net/fox9916/article/details/129016083
[Springboot_DisposableBean]: https://blog.csdn.net/fox9916/article/details/129026156?spm=1001.2014.3001.5501
[Springboot_SmartInitializingSingleton]: https://blog.csdn.net/fox9916/article/details/129042652
[Springboot]: https://blog.csdn.net/fox9916/article/details/128483069
[Springboot 1]: https://blog.csdn.net/fox9916/article/details/128225155