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 

然后是反序列化，也请求一个试试：