标签：r.java 自定义 span default framework exe groov push .class
Redis序列化对象的时候报错如下
java.lang.ClassCastException: com.ppdai.cbd.ddp.thirdparty.contract.bhxtzx.BHXTZXTask cannot be cast to java.lang.String at org.springframework.data.redis.serializer.StringRedisSerializer.serialize(StringRedisSerializer.java:33) at org.springframework.data.redis.core.AbstractOperations.rawValue(AbstractOperations.java:117) at org.springframework.data.redis.core.DefaultListOperations.leftPush(DefaultListOperations.java:71) at org.springframework.data.redis.core.DefaultBoundListOperations.leftPush(DefaultBoundListOperations.java:60) at com.ppdai.realtime.datachannel.pullservice.entity.RedisQueue.pushFromHead(RedisQueue.java:63) at com.ppdai.realtime.datachannel.pullservice.redisconfig.RedisTaskSender.sendTask(RedisTaskSender.java:35) at com.ppdai.realtime.datachannel.pullservice.redisconfig.RedisTaskSender$sendTask.call(Unknown Source) at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
BHXTZXTask是自己定义的Bean，因此问题就变成了自定义的对象不能转成String对象，为什么会需要转成String对象呢
查看源码，如下，通过rawValue()函数获取序列化之后的字节码
public Long leftPush(K key, V value) { final byte[] rawKey = rawKey(key); final byte[] rawValue = rawValue(value); return execute(new RedisCallback<Long>() { public Long doInRedis(RedisConnection connection) { return connection.lPush(rawKey, rawValue); } }, true); }
private byte[] rawValue(Object value) {
if (valueSerializer == null && value instanceof byte[]) {
return (byte[]) value;
}
return valueSerializer.serialize(value);
}
通过 valueSerializer序列化来序列化对象, redis如果不配置，默认 valueSerializer的序列化是会使用
StringRedisSerializer stringRedisSerializer = new StringRedisSerializer(); JdkSerializationRedisSerializer jdkSerializationRedisSerializer = new JdkSerializationRedisSerializer(); System.out.println(redisTemplate.hasKey("bohai_credit")); redisTemplate.delete("bohai_credit"); System.out.println(stringRedisSerializer.serialize("bohai_credit")); System.out.println(jdkSerializationRedisSerializer.serialize("bohai_credit"));
[B@21831984
[B@4488db1f
运行结果如上所示。
Redis 自定义对象 cannot be cast to java.lang.String
标签：r.java 自定义 span default framework exe groov push .class
原文地址：https://www.cnblogs.com/zhengwangzw/p/9965406.html
