解决redis序列化java8 LocalDateTime错误的问题

redis序列化选择方式

<!-- 缓存序列化方式 -->    <!--对key的默认序列化器。默认值是StringSerializer-->    <bean id="keySerializer" class="org.springframework.data.redis.serializer.StringRedisSerializer" />    <!--是对value的默认序列化器，默认值是取自DefaultSerializer的JdkSerializationRedisSerializer。-->    <bean id="valueSerializer" class="org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer" >    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">        <property name="connectionFactory"   ref="connectionFactory" />        <!-- 这里修改了redis默认的序列化方式 -->        <property name="keySerializer" ref="keySerializer" />        <property name="valueSerializer" ref="valueSerializer" />        <property name="hashKeySerializer" ref="keySerializer" />        <property name="hashValueSerializer" ref="valueSerializer" />    </bean>

要序列化class Demo

public class Demo {    private Long id;    private String name;    private LocalDateTime time;    ......    }

操作存入redis中

@Testpublic void test1() {     Demo demo = new Demo();     demo.setId(10000000001L);     demo.setName("测试序列化");     demo.setTime(LocalDateTime.now());    redisTemplate.opsForValue().set("test", demo); }

在redis中查看

{  "@class": "com.karmay3d.Demo",  "id": 10000000001,  "name": "测试序列化",  "time": {    "dayOfMonth": 15,    "dayOfWeek": "TUESDAY",    "dayOfYear": 227,    "month": "AUGUST",    "monthValue": 8,    "year": 2017,    "hour": 14,    "minute": 45,    "second": 51,    "nano": 921000000,    "chronology": {      "@class": "java.time.chrono.IsoChronology",      "id": "ISO",      "calendarType": "iso8601"    }  }}

LocalDateTime 存储的方式有问题。然后再从redis中取出Demo

@Test    public void test2() {        Demo demo = redisTemplate.opsForValue().get("test");        System.out.println(demo.getId());    }

报异常

org.springframework.data.redis.serializer.SerializationException: Could not read JSON: Can not construct instance of java.time.LocalDateTime: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?) at [Source: [B@68d651f2; line: 1, column: 81] (through reference chain: com.karmay3d.Demo["time"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of java.time.LocalDateTime: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?) at [Source: [B@68d651f2; line: 1, column: 81] (through reference chain: com.karmay3d.Demo["time"])......Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of java.time.LocalDateTime: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?) at [Source: [B@68d651f2; line: 1, column: 81] (through reference chain: com.karmay3d.Demo["time"])    at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270)    at com.fasterxml.jackson.databind.DeserializationContext.instantiationException(DeserializationContext.java:1456)......

这个问题真的是纠结了几天。。。解决办法
mavan需要的jar包

<dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-annotations</artifactId>    <version>${jackson.version}</version></dependency><dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-databind</artifactId>    <version>${jackson.version}</version></dependency><dependency>    <groupId>com.fasterxml.jackson.core</groupId>    <artifactId>jackson-core</artifactId>    <version>${jackson.version}</version></dependency><dependency>    <groupId>com.fasterxml.jackson.datatype</groupId>    <artifactId>jackson-datatype-jsr310</artifactId>    <version>${jackson.version}</version></dependency>

LocalDateTime属性加上注解
@JsonDeserialize(using = LocalDateTimeDeserializer.class)
@JsonSerialize(using = LocalDateTimeSerializer.class)

public class Demo {    private Long id;    private String name;    @JsonDeserialize(using = LocalDateTimeDeserializer.class)    @JsonSerialize(using = LocalDateTimeSerializer.class)    private LocalDateTime time;    ......    }

redis再次存入之后结构

{  "@class": "com.karmay3d.Demo",  "id": 10000000001,  "name": "测试序列化",  "time": [2017,8,15,14,57,37,525000000]}

之后反序列化就可以取出Demo对象了。

解决这个问题查找的问答