参考资料

1. SpringBoot–LocalDateTime格式转换(前端入参)
2. SpringBoot @InitBinder注解绑定请求参数

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分析
⏹当前台的提交数据的Content-Type为以下情况

• application/x-www-form-urlencoded: 表单提交。
• multipart/form-data: 二进制流提交，多用于上传文件。

的时候，使用此转换方式。

⏹ 会用到全局日期转换工具类DateUtil.formatDateStrToDateAllFormat()，详情可以参考 SpringBoot JSON全局日期格式转换器

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一. 实现Converter<S, T>接口的方式

• 实现Spring的Converter接口，指定将String转换为Date

import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;import java.util.Date;@Component
public class GlobalFormStrToDateConvert implements Converter<String, Date> {@Overridepublic Date convert(String dateStr) {try {return DateUtil.formatDateStrToDateAllFormat(dateStr);} catch (Exception e) {return null;}}
}

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二. 全局@ControllerAdvice + @InitBinder注解的方式

• @ControllerAdvice注解会拦截所有controller请求，配合@InitBinder注解，在参数封装到实体类之前将String日期转换为Date日期。

import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.InitBinder;import java.beans.PropertyEditorSupport;
import java.util.Date;@ControllerAdvice
public class GlobalFormStrToDateConvert {@InitBinderprotected void dateStrToDate(WebDataBinder binder) {binder.registerCustomEditor(Date.class, new PropertyEditorSupport() {@Overridepublic void setAsText(String dateStr) throws IllegalArgumentException {Date date = DateUtil.formatDateStrToDateAllFormat(dateStr);setValue(date);}});}
}

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三. RequestMappingHandlerAdapter的方式

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.support.WebBindingInitializer;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;import java.beans.PropertyEditorSupport;
import java.util.Date;@Configuration
public class GlobalFormStrToDateConvert {@Beanpublic RequestMappingHandlerAdapter webBindingInitializer(RequestMappingHandlerAdapter requestMappingHandlerAdapter) {// 通过lombda表达式创建WebBindingInitializer对象WebBindingInitializer webBindingInitializer = binder -> binder.registerCustomEditor(Date.class, new PropertyEditorSupport() {@Overridepublic void setAsText(String dateStr) {Date date = DateUtil.formatDateStrToDateAllFormat(dateStr);setValue(date);}});requestMappingHandlerAdapter.setWebBindingInitializer(webBindingInitializer);return requestMappingHandlerAdapter;}
}

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四. 效果

⏹前台JS

const jsonData = {// 👉待处理的日期字符串数据birthday: '20210105',nameAA: 'jiafeitian',hobby: '吃饭'
};$.ajax({url: '后台url',type: 'POST',// 对象转换为json字符串data: jsonData,// 指定为表单提交contentType: "application/x-www-form-urlencoded",success: function (data, status, xhr) {console.log(data);}
});

⏹后台Form

import lombok.Data;
import java.util.Date;@Data
public class Test15Form {private String name;private String hobby;private String address;// 用来接收的Date类型的数据private Date birthday;
}

👇可以看到前台提交的日期字符串被转换为Date格式了