redis存数据时出现类型转换问题
问题描述：
存入的是点赞数据，包括：
- @param likeuserid 点赞用户id
- @param likepostid 被点赞文章id
- @param likeanswerid 被点赞回答id
点击点赞按钮后，出现 500 错误。
相关代码：
//redisserviceimpl.java
@override
public void saveliked2redis(integer likeuserid, integer likepostid, integer likeanswerid) {
string key = rediskeyutils.getlikedkey(likeuserid, likepostid, likeanswerid);
redistemplate.opsforhash().put(rediskeyutils.map_key_user_liked, key, constant.redis_like_code);
}//redislikecontroller.java
@requestmapping("/userlike")
public responsejson userlike(@requestbody userlike userlike) {
redisservice.saveliked2redis(userlike.getlikeuserid(), userlike.getlikepostid(), userlike.getlikeanswerid());
return new responsejson(constant.http_code_ok, null, "点赞成功");
}//userlike.java private integer id;//主键id private integer likeuserid;//点赞人id private integer likepostid;//被点赞文章id private integer likeanswerid;//被点赞回答id private integer status = 0;//点赞的状态，默认未点赞0 0：未点赞 1：已点赞
错误信息：
java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
at org.springframework.data.redis.serializer.StringRedisSerializer.serialize(StringRedisSerializer.java:36) ~[spring-data-redis-2.4.1.jar:2.4.1]
at org.springframework.data.redis.core.AbstractOperations.rawHashValue(AbstractOperations.java:185) ~[spring-data-redis-2.4.1.jar:2.4.1]
at org.springframework.data.redis.core.DefaultHashOperations.put(DefaultHashOperations.java:189) ~[spring-data-redis-2.4.1.jar:2.4.1]
at com.xinshuo.treehole.service.impl.RedisServiceImpl.saveLiked2Redis(RedisServiceImpl.java:27) ~[classes/:na]
at com.xinshuo.treehole.controller.RedisLikeController.userLike(RedisLikeController.java:28) ~[classes/:na]
at com.xinshuo.treehole.controller.RedisLikeController$$FastClassBySpringCGLIB$$3ba7a07d.invoke(zuojiankuohaophpcngeneratedyoujiankuohaophpcn) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.3.1.jar:5.3.1]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771) ~[spring-aop-5.3.1.jar:5.3.1]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.3.1.jar:5.3.1]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.3.1.jar:5.3.1]
at org.apache.shiro.spring.security.interceptor.AopAllianceAnnotationsAuthorizingMethodInterceptor$1.proceed(AopAllianceAnnotationsAuthorizingMethodInterceptor.java:82) ~[shiro-spring-1.6.0.jar:1.6.0]
at org.apache.shiro.authz.aop.AuthorizingMethodInterceptor.invoke(AuthorizingMethodInterceptor.java:39) ~[shiro-core-1.6.0.jar:1.6.0]
at org.apache.shiro.spring.security.interceptor.AopAllianceAnnotationsAuthorizingMethodInterceptor.invoke(AopAllianceAnnotationsAuthorizingMethodInterceptor.java:115) ~[shiro-spring-1.6.0.jar:1.6.0]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.1.jar:5.3.1]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.3.1.jar:5.3.1]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691) ~[spring-aop-5.3.1.jar:5.3.1]
at com.xinshuo.treehole.controller.RedisLikeController$$EnhancerBySpringCGLIB$$94f52a1c.userLike(zuojiankuohaophpcngeneratedyoujiankuohaophpcn) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_202]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_202]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_202]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_202]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) ~[spring-web-5.3.1.jar:5.3.1]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141) ~[spring-web-5.3.1.jar:5.3.1]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.1.jar:5.3.1]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:893) ~[spring-webmvc-5.3.1.jar:5.3.1]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:807) ~[spring-webmvc-5.3.1.jar:5.3.1]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.1.jar:5.3.1]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1061) ~[spring-webmvc-5.3.1.jar:5.3.1]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:961) ~[spring-webmvc-5.3.1.jar:5.3.1]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.1.jar:5.3.1]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.1.jar:5.3.1]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.39.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.1.jar:5.3.1]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.39.jar:4.0.FR] 
