redis中@type导致取数据解析报错
java.lang.ClassCastException: com.alibaba.fastjson.JSONObject cannot be cast to
新建一个对象存入redis中，对象中会出现一个字段@type
1 2 3 | LoginUser user = new LoginUser ()......redisTemplate.opsForValue().set(key, user) |
存入redis中数据如下
1 2 3 | 127.0.0.1:6379> get login_tokens:5be4de32-6eb5-44a5-b212-56d93e3fc067"{"@type":"com.common.core.domain.model.LoginUser","deptId":103L,"expireTime":1710463649132,"token":"xxxx","user":{"admin":true,"createBy":"admin","dept":{"deptId":103L,"deptName":"xxx","orderNum":1,"params":{"@type":"java.util.HashMap"},"parentId":101L,"status":"0"},"deptId":103L,"loginDate":"2024-03-14 14:35:56","loginIp":"127.0.0.1","nickName":"xxx","params":{"@type":"java.util.HashMap"},"phonenumber":"15888888888","sex":"1","status":"0","userId":1L,"userName":"admin"},"userId":1L,"username":"admin"}"127.0.0.1:6379> |
取数据时，redisTemplate.opsForValue().get(key);
如果LoginUser对象的包与存入时的包路径不一致，会报错java.lang.ClassCastException: com.alibaba.fastjson.JSONObject cannot be cast to
redis缓存序列化导致存储数据没有@type
在使用redis注解将数据缓存的时候发现存储进去的数据是这样的，没有@type
1 2 3 | 127.0.0.1:6379> get login_tokens:5be4de32-6eb5-44a5-b212-56d93e3fc067"{"deptId":103L,"expireTime":1710463649132,"token":"xxxx","user":{"admin":true,"createBy":"admin","dept":{"deptId":103L,"deptName":"xxx","orderNum":1,"parentId":101L,"status":"0"},"deptId":103L,"loginDate":"2024-03-14 14:35:56","loginIp":"127.0.0.1","nickName":"xxx","phonenumber":"15888888888","sex":"1","status":"0","userId":1L,"userName":"admin"},"userId":1L,"username":"admin"}"127.0.0.1:6379> |
之前通过set方法放进去的数据是这样的
1 2 3 | 127.0.0.1:6379> get login_tokens:5be4de32-6eb5-44a5-b212-56d93e3fc067"{"@type":"com.common.core.domain.model.LoginUser","deptId":103L,"expireTime":1710463649132,"token":"xxxx","user":{"admin":true,"createBy":"admin","dept":{"deptId":103L,"deptName":"xxx","orderNum":1,"params":{"@type":"java.util.HashMap"},"parentId":101L,"status":"0"},"deptId":103L,"loginDate":"2024-03-14 14:35:56","loginIp":"127.0.0.1","nickName":"xxx","params":{"@type":"java.util.HashMap"},"phonenumber":"15888888888","sex":"1","status":"0","userId":1L,"userName":"admin"},"userId":1L,"username":"admin"}"127.0.0.1:6379> |
原因：
是因为set方法的序列化方法和注解的序列化方法不同
解决办法：
将序列化方法更换成set方法所使用的序列化方法
下面是序列化方法
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | public class FastJson2JsonRedisSerializer implements RedisSerializer { @SuppressWarnings("unused") private ObjectMapper objectMapper = new ObjectMapper(); public static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8; private Class clazz; static { ParserConfig.getGlobalInstance().setAutoTypeSupport(true); } public FastJson2JsonRedisSerializer(Class clazz) { super(); this.clazz = clazz; } @Override public byte[] serialize(T t) throws SerializationException { if (t == null) { return new byte[0]; } return JSON.toJSONString(t, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET); } @Override public T deserialize(byte[] bytes) throws SerializationException { if (bytes == null || bytes.length clazz) { return TypeFactory.defaultInstance().constructType(clazz); }} |
SerializerFeature.WriteClassName这个序列化
1 2 3 | public static String getString(Object object) { return JSON.toJSONString(object, SerializerFeature.WriteClassName);} |
如果加了SerializerFeature.WriteClassName存进redis当中的实体类就会带@type路径地址
“@type”:“com.xxx.xxx.entity.OpenNotice”
问题解决方案:去掉@type 或者 两边@type路径存放路径一致 (包名和实体类修改为一致)
去掉@type使用 JSONObject.toJSONString(obj)来存value实体类
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | /** * hashMap存值方式 * * @param parentKey * @param fieldKey * @param obj */public static void hashSet(String parentKey, String fieldKey, Object obj) { try { jedis.hset(parentKey, fieldKey, JSONObject.toJSONString(obj)); //jedis.hset(parentKey, fieldKey, JSONParser.getString(obj)); //"@type":"com.xyz.miniLegion.entity.OpenNotice" } finally { jedis.close(); }} |
获取hashAll数据
1 2 3 4 5 6 7 8 9 10 11 12 | /** * 获取hashGetAll * @param parentKey * @return */ public Map hashGetAll(String parentKey) { try (Jedis jedis = pools.getResource()) { //这种写法不需要手动close(); return jedis.hgetAll(parentKey); }catch (Exception e) { return null; } } |
测试Redis转实体类`
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | @Test void getSoldierAttribute() { Map openNoticeMap = redisPoolMgr.hashGetAll(StaticData.OpenNotice); //第一种根据key循环 for (String key : openNoticeMap.keySet()) { OpenNotice openNotice = JSONObject.parseObject(openNoticeMap.get(key), OpenNotice.class); System.out.println("根据key循环:" +openNotice.getContent()); System.out.println("根据key循环:" + JSONObject.toJSONString(openNotice)); } //第二种根据value循环 for (String values : openNoticeMap.values()) { OpenNotice openNotice = JSONObject.parseObject(values, OpenNotice.class); System.out.println("根据value循环:"+openNotice.getContent()); System.out.println("根据value循环:" + JSONObject.toJSONString(openNotice)); } } |
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