SpringBoot日期格式转换之配置全局日期格式转换器的实例详解

spring:
 # 配置日期格式化
 jackson:
 date-format: yyyy-MM-dd HH:mm:ss #时间戳统一转换为指定格式
 time-zone: GMT+8 # 时区修改为东8区

spring.jackson.date-format=yyyy-MM-dd HH:mm:ss	#时间戳统一转换为指定格式
spring.jackson.time-zOne=GMT+8	# 时区修改为东8区

//在pattern上设置自己需要的格式
	@JsonFormat(pattern="yyyy-MM-dd HH:mm:ss")
	private Date createTime;

//注解将yyyy-MM-dd的形式转换为Date数据
 @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
 private Date birthday;

@Temporal(TemporalType.TIMESTAMP)
private Date createTime;

import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;


//Converter S: 代表的是源,将要转换的数据类型 T:目标类型,将会转成什么数据类型
@Component
public class GlobalFormDateConvert implements Converter {

 //静态初始化定义日期字符串参数列表（需要转换的）
 private static final List paramList = new ArrayList<>();

 //静态初始化可能初夏你的日期格式
 private static final String param1 = "yyyy-MM";
 private static final String param2 = "yyyy-MM-dd";
 private static final String param3 = "yyyy-MM-dd HH:mm";
 private static final String param4 = "yyyy-MM-dd HH:mm:ss";

 //静态代码块，将日期参数加入到列表中
 static {
  paramList.add(param1);
  paramList.add(param2);
  paramList.add(param3);
  paramList.add(param4);
 }

 //自定义函数，将字符串转Date 参1：传入的日期字符串 参2：格式参数
 public Date parseDate(String source, String format) {
  System.out.println("parseDate转换日期");
  Date date = null;
  try {
   //日期格式转换器
   DateFormat dateFormat = new SimpleDateFormat(format);
   date = dateFormat.parse(source);
  } catch (Exception e) {
   e.printStackTrace();
  }
  return date;
 }


 //convert转换方法 ，s是将会传递过来的日期的字符串
 @Override
 public Date convert(String source) {

  System.out.println("convert日期格式转换器");
  if(StringUtils.isEmpty(source)){
   return null;
  }
  source = source.trim(); //去除首尾空格
  DateFormat dateFormat = new SimpleDateFormat(param1);

  //正则表达式判断是哪一种格式参数
  if (source.matches("^\\d{4}-\\d{1,2}$")) {
   return parseDate(source, paramList.get(0));
  } else if (source.matches("^\\d{4}-\\d{1,2}-\\d{1,2}$")) {
   return parseDate(source, paramList.get(1));
  } else if (source.matches("^\\d{4}-\\d{1,2}-\\d{1,2} {1}\\d{1,2}:\\d{1,2}$")) {
   return parseDate(source, paramList.get(2));
  } else if (source.matches("^\\d{4}-\\d{1,2}-\\d{1,2} {1}\\d{1,2}:\\d{1,2}:\\d{1,2}$")) {
   return parseDate(source, paramList.get(3));
  } else {
   throw new IllegalArgumentException("还未定义该种字符串转Date的日期转换格式 --> 【日期格式】：" + source);
  }
 }
}

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.springframework.util.StringUtils;

public class GlobalJsonDateConvert extends StdDateFormat {

 //静态初始化final，共享
 public static final GlobalJsonDateConvert instance = new GlobalJsonDateConvert();

 //覆盖parse(String)这个方法即可实现
 @Override
 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) {
  System.out.println("json格式日期转换");
  SimpleDateFormat sdf = null;
  if (StringUtils.isEmpty(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 GlobalJsonDateConvert clone() {
  return new GlobalJsonDateConvert();
 }
}

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.xgf.online_mall.convert.GlobalFormDateConvert;
import com.xgf.online_mall.convert.GlobalJsonDateConvert;
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.json.MappingJackson2HttpMessageConverter;

import java.util.ArrayList;
import java.util.List;
import java.util.HashSet;
import java.util.Set;


@Configuration
public class WebConfig {

 //JSON格式 全局日期转换器配置
 @Bean
 public MappingJackson2HttpMessageConverter getMappingJackson2HttpMessageConverter() {
  MappingJackson2HttpMessageConverter mappingJackson2HttpMessageCOnverter= new MappingJackson2HttpMessageConverter();
  //设置日期格式
  ObjectMapper objectMapper = new ObjectMapper();
  objectMapper.setDateFormat(GlobalJsonDateConvert.instance);
  objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
  mappingJackson2HttpMessageConverter.setObjectMapper(objectMapper);
  //设置中文编码格式
  List list = new ArrayList();
  list.add(MediaType.APPLICATION_JSON_UTF8);
  mappingJackson2HttpMessageConverter.setSupportedMediaTypes(list);
  return mappingJackson2HttpMessageConverter;
 }

 //表单格式 全局日期转换器

 @Bean
 @Autowired
 public ConversionService getConversionService(GlobalFormDateConvert globalDateConvert){
  ConversionServiceFactoryBean factoryBean = new ConversionServiceFactoryBean();
  Set cOnverters= new HashSet<>();
  converters.add(globalDateConvert);
  factoryBean.setConverters(converters);
  return factoryBean.getObject();
 }
}