Modelmapper从String转换为LocalDate [英] Modelmapper to convert from String to LocalDate

问题描述

我的DTO具有字符串格式的日期字段.我的实体的日期为LocalDate.目前，我正在从地图上跳过它，然后稍后手动将其显式设置(将String设置为Date，反之亦然).

My DTO is having date field in String format. My entity is having date as LocalDate. Currently I am skipping it from map and then later manually explicitly setting it (String to Date and vis-versa).

是否可以自动转换?我在spring bean中尝试了Converter，但它给了我很多编译错误(Converter类型不接受参数，不覆盖convert方法-convert()也存在很多错误).

is it possible to convert it automatically? I tried Converter inside spring bean but it gives me lot of compile errors (type Converter does not take parameters, does not override convert method - also lot of error for convert() as well).

@Bean
public ModelMapper studentModelMapper() {
....    
    Converter<String, LocalDate> toStringDate = new AbstractConverter<String, LocalDate>() {
        protected String convert(String source) {
            return source == null ? null : new LocalDate(source);
        }
    };
....
}

我对modelmapper不太熟悉.任何帮助是极大的赞赏.

I am not very familiar with modelmapper. Any help is greatly appreciated.

按照建议，我尝试使用DTO的LocalDate，但问题是当我在前端发送该实体(REST调用)时，我会遵循JSON.

As suggested I tried with LocalDate for DTO but the problem is when I send this entity at front (REST call) I get following JSON.

"dateOfBirth": {
   "year": 1972,
   "month": "JANUARY",
   "monthValue": 1,
   "dayOfMonth": 4,
   "dayOfWeek": "TUESDAY",
   "era": "CE",
   "dayOfYear": 4,
   "leapYear": true,
   "chronology": {
      "id": "ISO",
      "calendarType": "iso8601"
   }
}

我的前端开发人员需要"YYYY-MM-DD".

My front end developer need "YYYY-MM-DD".

推荐答案

如果要转换为LocalDate，则需要创建Provider，否则ModelMapper无法实例化LocalDate，因为它没有公共默认构造函数.

If you want to convert to LocalDate you need to create a Provider otherwise ModelMappercannot instantiate LocalDate because it doesn't have a public default constructor.

使用此配置，它将起作用:

Use this configuration and it will work:

 ModelMapper modelmapper = new ModelMapper();

    Provider<LocalDate> localDateProvider = new AbstractProvider<LocalDate>() {
        @Override
        public LocalDate get() {
            return LocalDate.now();
        }
    };

    Converter<String, LocalDate> toStringDate = new AbstractConverter<String, LocalDate>() {
        @Override
        protected LocalDate convert(String source) {
            DateTimeFormatter format = DateTimeFormatter.ofPattern("yyyy-MM-dd");
            LocalDate localDate = LocalDate.parse(source, format);
            return localDate;
        }
    };


    modelmapper.createTypeMap(String.class, LocalDate.class);
    modelmapper.addConverter(toStringDate);
    modelmapper.getTypeMap(String.class, LocalDate.class).setProvider(localDateProvider);

测试输出:

 String dateTest = "2000-09-27";
 LocalDate dateConverted = modelmapper.map(dateTest, LocalDate.class);

 System.out.println(dateConverted.toString()); //Output = 2000-09-27

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