SpringBoot2.0整合jackson配置日期格式化和反序列化的实现

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网上杂七杂八的说法不一，大多数都是抄来抄去，没有实践，近期在项目频繁遇到boot+jackson处理日期的问题，故开此贴。

首先是POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>io.cj.learning</groupId>
  <artifactId>boot2exam</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>boot2exam</name>
  <description>Demo project for Spring Boot</description>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <version>RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <version>RELEASE</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>


</project>

然后是yml文件

（当然yml这东西很多人不喜欢，我也写了个properties版本的）

spring:
  jackson:
    #参数意义：
    #JsonInclude.Include.ALWAYS       默认
    #JsonInclude.Include.NON_DEFAULT   属性为默认值不序列化
    #JsonInclude.Include.NON_EMPTY     属性为 空（””） 或者为 NULL 都不序列化
    #JsonInclude.Include.NON_NULL      属性为NULL  不序列化
    default-property-inclusion: ALWAYS
    time-zone: GMT+8
    date-format: yyyy-MM-dd HH:mm:ss

上面配置对应的properties文件版本：

#jackson相关配置
spring.jackson.date-format = yyyy-MM-dd HH:mm:ss
#时区必须要设置
spring.jackson.time-zone= GMT+8
#ALWAYS的意思是即时属性为null，仍然也会输出这个key
spring.jackson.default-property-inclusion=ALWAYS

然后来定义一个Controller和JAVA Bean

Controller：

package io.cj.learning.boot2exam.controller;

import io.cj.learning.boot2exam.model.DateFormatTest;
import org.springframework.web.bind.annotation.*;

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

@RestController
@RequestMapping(value="/test")
public class TestController {


  /**
   * 测试时间序列化, java.util.date 类型 -> String
   * @return
   */
  @RequestMapping(value="/dateFormatTest", method = RequestMethod.GET)
  @ResponseBody
   public DateFormatTest dateFormatTest(){
    DateFormatTest dateFormatTest = new DateFormatTest();
    dateFormatTest.setIntProperties(100);
    dateFormatTest.setDateProperties(new Date());
    return dateFormatTest;
  }

  /**
   * 测试时间反序列化 String -> java.util.date 类型
   */
  @RequestMapping(value="/dateFormatTest2" ,method = RequestMethod.POST)
  public void dateFormatTest2(@RequestBody DateFormatTest model){
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    System.out.println(model.getIntProperties());
    System.out.println(sdf.format(model.getDateProperties()));
    System.out.println(model.getStrProperties());
  }
}

Java Bean：

package io.cj.learning.boot2exam.model;

import java.util.Date;

/**
 * 一个model，里面带一个日期类型
 */
public class DateFormatTest {

  private Integer intProperties;
  private Date dateProperties;
  private String strProperties;

  public Integer getIntProperties() {
    return intProperties;
  }

  public void setIntProperties(Integer intProperties) {
    this.intProperties = intProperties;
  }

  public Date getDateProperties() {
    return dateProperties;
  }

  public void setDateProperties(Date dateProperties) {
    this.dateProperties = dateProperties;
  }

  public String getStrProperties() {
    return strProperties;
  }

  public void setStrProperties(String strProperties) {
    this.strProperties = strProperties;
  }
}

启动主类：

package io.cj.learning.boot2exam;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Boot2examApplication {

  public static void main(String[] args) {
    SpringApplication.run(Boot2examApplication.class, args);
  }
}

测试：

试一下，首先是日期序列化，请求一下试试