A unique experience of stepping on a pit

When there is a date of string type in the current page request, the Java backend needs to convert the string type to the date type. In springboot, the convertor interface is implemented through the custom dateconverterconfig class, which is put into the spring container for conversion.

！ Here’s the key point:
when I knock step by step, there is still an exception * * here was an unexpected error (type = bad request, status = 400). * * *. Finally, I found that the converter’s package was wrong
remember: import org.springframework.core.convert.converter.converter;

package com.jiansheng.util;

import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * @Author: Jiansheng
 * @DateTime: 2021/6/27 10:35
 * @Description:Date
 */
@Component
public class DateConverterConfig implements Converter<String, Date> {

    private static final List<String> formarts = new ArrayList<>(4);
    static{
        formarts.add("yyyy-MM");
        formarts.add("yyyy-MM-dd");
        formarts.add("yyyy-MM-dd HH:mm");
        formarts.add("yyyy-MM-dd HH:mm:ss");
    }

    @Override
    public Date convert(String source) {
        String value = source.trim();
        if ("".equals(value)) {
            return null;
        }
        if(source.matches("^\\d{4}-\\d{1,2}$")){
            return parseDate(source, formarts.get(0));
        }else if(source.matches("^\\d{4}-\\d{1,2}-\\d{1,2}$")){
            return parseDate(source, formarts.get(1));
        }else if(source.matches("^\\d{4}-\\d{1,2}-\\d{1,2} {1}\\d{1,2}:\\d{1,2}$")){
            return parseDate(source, formarts.get(2));
        }else if(source.matches("^\\d{4}-\\d{1,2}-\\d{1,2} {1}\\d{1,2}:\\d{1,2}:\\d{1,2}$")){
            return parseDate(source, formarts.get(3));
        }else {
            throw new IllegalArgumentException("Invalid boolean value '" + source + "'");
        }
    }

    /**
     * Formatting the date
     * @param dateStr String Character type date
     * @param format String Format
     * @return Date Date
     */
    public  Date parseDate(String dateStr, String format) {
        Date date=null;
        try {
            DateFormat dateFormat = new SimpleDateFormat(format);
            date = dateFormat.parse(dateStr);
        } catch (Exception e) {

        }
        return date;
    }

}

Jiansheng