Jackson全局日期格式化

方式1：使用@JsonComponent方式（推荐）

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.jackson.JsonComponent;

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

/**
 * Jackson全局日期格式化
 *
 * @author nijl
 * @date 2020/6/29
 */
@Slf4j
@JsonComponent
public class DateFormatConfig {

    private static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    private static final List 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");
    }

    /**
     * 日期格式化
     * 会忽略实体类JsonFormat注解方式
     */
    public static class DateJsonSerializer extends JsonSerializer {
        @Override
        public void serialize(Date date, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
            jsonGenerator.writeString(dateFormat.format(date));
        }
    }

    /**
     * 解析日期字符串
     */
    public static class DateJsonDeserializer extends JsonDeserializer {
        @Override
        public Date deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            return convert(jsonParser.getText());
        }
    }

    public static 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 date value '" + source + "'");
        }
    }

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

}

方式2：使用继承WebMvcConfigurationSupport方式

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.format.FormatterRegistry;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.io.IOException;
import java.util.Date;
import java.util.List;

/**
 * @author nijl
 * @date 2020/6/18
 */

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

    @Autowired
    private DateConverterConfig dateConverterConfig;

    /**
     * 添加自定义的Converters和Formatters.
     */
    @Override
    protected void addFormatters(FormatterRegistry registry) {
        registry.addConverter(dateConverterConfig);
    }

    /**
     * 解决继承WebMvcConfigurationSupport
     *
     * @param converters
     */
    @Override
    protected void configureMessageConverters(List> converters) {
        MappingJackson2HttpMessageConverter converter;
        converter = new MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = new ObjectMapper();
        SimpleModule module = new SimpleModule();
        module.addDeserializer(Date.class, new JsonDeserializer() {
            @Override
            public Date deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
                return dateConverterConfig.convert(jsonParser.getText());
            }
        });
        objectMapper.registerModule(module);
        converter.setObjectMapper(objectMapper);
        converters.add(converter);
        super.configureMessageConverters(converters);
    }

    /**
     * 如果继承了WebMvcConfigurationSupport，则在yml中配置的相关内容会失效。 需要重新指定静态资源
     *
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/**")
                .addResourceLocations("classpath:/static/")
                .addResourceLocations("classpath:/resources/")
                .addResourceLocations("classpath:/META-INF/resources/");
        super.addResourceHandlers(registry);
    }
}

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 nijl
 * @date 2020/6/18
 */
@Component
public class DateConverterConfig implements Converter {

    private static final List 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
     */
    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;
    }

}