Springboot配置全局日期转换器

1.Json传参方式

package com.example.config;

import java.text.FieldPosition;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;

import com.fasterxml.jackson.databind.util.StdDateFormat;
import org.apache.commons.lang3.StringUtils;

/**
 * JSON形式的全局时间类型转换器
 */
public class CustomDateFormat extends StdDateFormat {

    private static final long serialVersionUID = -3201781773655300201L;

    public static final CustomDateFormat instance = new CustomDateFormat();

    @Override
    /**
     * 只要覆盖parse(String)这个方法即可
     */
    public Date parse(String dateStr, ParsePosition pos) {
        return getDate(dateStr, pos);
    }

    @Override
    public Date parse(String dateStr) {
        ParsePosition pos = new ParsePosition(0);
        return getDate(dateStr, pos);
    }

    private Date getDate(String dateStr, ParsePosition pos) {
        SimpleDateFormat sdf = null;
        if (StringUtils.isBlank(dateStr)) {
            return null;
        } else if (dateStr.matches("^\d{4}-\d{1,2}$")) {
            sdf = new SimpleDateFormat("yyyy-MM");
            return sdf.parse(dateStr, pos);
        } else if (dateStr.matches("^\d{4}-\d{1,2}-\d{1,2}$")) {
            sdf = new SimpleDateFormat("yyyy-MM-dd");
            return sdf.parse(dateStr, pos);
        } else if (dateStr.matches("^\d{4}-\d{1,2}-\d{1,2} {1}\d{1,2}:\d{1,2}$")) {
            sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
            return sdf.parse(dateStr, pos);
        } else if (dateStr.matches("^\d{4}-\d{1,2}-\d{1,2} {1}\d{1,2}:\d{1,2}:\d{1,2}$")) {
            sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            return sdf.parse(dateStr, pos);
        } else if (dateStr.length() == 23) {
            sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
            return sdf.parse(dateStr, pos);
        }
        return super.parse(dateStr, pos);
    }

    @Override
    public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition){
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return sdf.format(date, toAppendTo, fieldPosition);
    }

    @Override
    public CustomDateFormat clone() {
        return new CustomDateFormat();
    }
}

2.表单传参方式

package com.example.config;

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;

/**
 * 表单形式的全局时间类型转换器
 */
@Component
public class DateConverter 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 + "'");
        }
    }

    /**
     * 格式化日期
     *
     * @param dateStr String 字符型日期
     * @param format  String 格式
     * @return Date 日期
     */
    private Date parseDate(String dateStr, String format) {
        Date date = null;
        try {
            DateFormat dateFormat = new SimpleDateFormat(format);
            date = dateFormat.parse(dateStr);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return date;
    }

}

3.配置

package com.example.config;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ConversionServiceFactoryBean;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.converter.Converter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    /**
     * 重写url路径匹配(忽略大小写敏感)
     */
    @Override
    public void configurePathMatch(PathMatchConfigurer configurer) {
        AntPathMatcher antPathMatcher = new AntPathMatcher();
        antPathMatcher.setCaseSensitive(false);
    }

    /**
     * JSON全局日期转换器
     */
    @Bean
    public MappingJackson2HttpMessageConverter getMappingJackson2HttpMessageConverter() {
        MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
        //设置日期格式
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setDateFormat(CustomDateFormat.instance);
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        mappingJackson2HttpMessageConverter.setObjectMapper(objectMapper);
        //设置中文编码格式
        List<MediaType> list = new ArrayList<MediaType>();
        list.add(MediaType.APPLICATION_JSON_UTF8);
        mappingJackson2HttpMessageConverter.setSupportedMediaTypes(list);
        return mappingJackson2HttpMessageConverter;
    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters){
        converters.add(getMappingJackson2HttpMessageConverter());
    }

    /**
     * 表单全局日期转换器
     */
    @Bean
    @Autowired
    public ConversionService getConversionService(DateConverter dateConverter){
        ConversionServiceFactoryBean factoryBean = new ConversionServiceFactoryBean();
        Set<Converter> converters = new HashSet<>();
        converters.add(dateConverter);
        factoryBean.setConverters(converters);
        return factoryBean.getObject();
    }
}

　　从此不再纠结用@DateTimeFormat(patten = "yyyyy-MM-dd")还是@DateTimeFormat(patten = "yyyyy-MM-dd HH：mm") ,告别烦恼，从全局时间转换器开始！！