目录spring-session自定义序列化自定义序列方法使用jackson库配置spring-session序列化spring-session序列化问题排查问题解决方法
spring-session自定义序列化
spring-session默认采用jdk序列化方法，该方法效率低下、内存占用大，且需要额外修改代码。故需要自定义序列化方法
自定义序列方法使用jackson库
首先需要一个类作为序列化的工具，需要实现
RedisSerializer
该接口在反序列化时没有提供对应的class对象，因此使用jackson反序列化时，都会返回成Object对象
因此我的解决思路是，在序列化时，获取对应bean的class，将其和bean序列化后的结果一并返回，存入redis
反序列化时，首先将byte数组转化成字符串，在从中截取存入的class字符串，作为参数传入jackson反序列化方法中
问题：对于带有泛型的bean，无法将其转化成真正适合的类型
解决方案：对于list，map，set等集合类，获取其第一个元素的class，存入redis
缺点：要求集合类元素必须是同一个子类，不能来自于同一个父类
问题：spring-session在删除attribute时，并没有真正从redis中删除，只是将value置为null，此时也会调用该类做序列化
解决方案：查看spring-session源码得知，对于null值得处理方法为直接返回一个个数为0的byte数组，反序列化时直接返回null即可
import cn.nsu.edu.web.four.config.BaseStatic;import com.fasterxml.jackson.core.JsonProcessingException;import com.fasterxml.jackson.databind.JavaType;import com.fasterxml.jackson.databind.ObjectMapper;import com.fasterxml.jackson.databind.type.TypeFactory;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.redis.serializer.RedisSerializer;import org.springframework.data.redis.serializer.SerializationException;import org.springframework.data.redis.serializer.SerializationUtils; import java.io.IOException;import java.io.UnsupportedEncodingException;import java.util.*;import java.util.regex.Matcher;import java.util.regex.Pattern; public class SessionSerializer implements RedisSerializer<Object> { @Autowired private ObjectMapper mapper; private Logger logger = LoggerFactory.getLogger(getClass()); private final String separator = "="; private final String classPrefix = "<"; private final String classSuffix = ">"; private final String classSeparator = ","; private Pattern pattern; public SessionSerializer() { pattern = Pattern.compile("<(.*)>"); } /** * 获取class，包含集合类的泛型 * <p>暂只支持最多两个泛型，同时集合内数据必须为同一个实现类，不可将泛型声明成父类</p> * * @param obj 将要序列化的对象 * @return 没有泛型，形式为java.lang.String<> * <p>一个泛型，形式为java.lang.String<java.lang.String></p> * <p>两个个泛型，形式为java.lang.String<java.lang.String,java.lang.String></p> */ private String getBegin(Object obj) { StringBuilder builder = new StringBuilder(obj.getClass().toString().substring(6) + classPrefix); if (obj instanceof List) { List list = ((List) obj); if (!list.isEmpty()) { Object temp = list.get(0); builder.append(temp.getClass().toString().substring(6)); } } else if (obj instanceof Map) { Map map = ((Map) obj); Iterator iterator = map.keySet().iterator(); if (iterator.hasNext()) { Object key = iterator.next(); Object value = map.get(key); builder.append(key.getClass().toString().substring(6)).append(classSeparator).append(value.getClass().toString().substring(6)); } } else if (obj instanceof Set) { Set set = ((Set) obj); Iterator iterator = set.iterator(); if (iterator.hasNext()) { Object value = iterator.next(); builder.append(value.getClass().toString().substring(6)); } } builder.append(classSuffix); return builder.toString(); } @Override public byte[] serialize(Object o) throws SerializationException { if (o == null) return new byte[0]; try { String builder = getBegin(o) + separator + mapper.writeValueAsString(o); return builder.getBytes(BaseStatic.CHARSET); } catch (UnsupportedEncodingException | JsonProcessingException e) { e.printStackTrace(); } return null; } @Override public Object deserialize(byte[] bytes) throws SerializationException { if (bytes == null || bytes.length == 0) return null;//已被删除的session try { String temp = new String(bytes, BaseStatic.CHARSET); String cl[] = getClass(temp); if (cl == null) { throw new RuntimeException("错误的序列化结果=" + temp); } if (cl.length == 1) { return mapper.readValue(temp.substring(temp.indexOf(separator) + 1), Class.forName(cl[0])); } else if (cl.length == 2) { TypeFactory factory = mapper.getTypeFactory(); JavaType type = factory.constructParametricType(Class.forName(cl[0]), Class.forName(cl[1])); return mapper.readValue(temp.substring(temp.indexOf(separator) + 1), type); } else if (cl.length == 3) { TypeFactory factory = mapper.getTypeFactory(); JavaType type = factory.constructParametricType(Class.forName(cl[0]), Class.forName(cl[1]), Class.forName(cl[2])); return mapper.readValue(temp.substring(temp.indexOf(separator) + 1), type); } } catch (ClassNotFoundException | IOException e) { e.printStackTrace(); } return null; } /** * 解析字符串，获取class * <p>一个类型,java.lang.String<>={}</p> * <p>两个类型，后面为泛型,java.lang.String<java.lang.String>={}</p> * <p>三个类型，后面为泛型,java.lang.String<java.lang.String,java.lang.String>={}</p> * * @param value 包含class的字符串 * @return 返回所有类的数组 */ private String[] getClass(String value) { int index = value.indexOf(classPrefix); if (index != -1) { Matcher matcher = pattern.matcher(value.subSequence(index, value.indexOf(classSuffix) + 1)); if (matcher.find()) { String temp = matcher.group(1); if (temp.isEmpty()) {//没有泛型 return new String[]{value.substring(0, index)}; } else if (temp.contains(classSeparator)) {//两个泛型 int nextIndex = temp.indexOf(classSeparator); return new String[]{ value.substring(0, index), temp.substring(0, nextIndex), temp.substring(nextIndex + 1) }; } else {//一个泛型 return new String[]{ value.substring(0, index), temp }; } } } return null; }}
配置spring-session序列化
在之前的配置文件上进行修改
<bean id="springSessionDefaultRedisSerializer" class="cn.nsu.edu.web.four.session.serializer.SessionSerializer"/> <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory" destroy-method="destroy"> <property name="hostName" value="${redis.host}"/> <property name="port" value="${redis.port}"/> <property name="timeout" value="${redis.timeout}"/> <property name="password" value="${redis.password}"/> <property name="database" value="${redis.database}"/> <property name="usePool" value="true"/> <property name="poolConfig" ref="redisPoolConfig"/> </bean> <bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate"> <property name="connectionFactory" ref="jedisConnectionFactory"/> <property name="defaultSerializer" ref="springSessionDefaultRedisSerializer"/> <!--指定序列化类--> <property name="valueSerializer" ref="springSessionDefaultRedisSerializer"/> <property name="hashValueSerializer" ref="springSessionDefaultRedisSerializer"/> </bean>
spring-session序列化问题排查
严重: Servlet.service() for servlet [spring] in context with path [/] threw exceptionorg.springframework.data.redis.serializer.SerializationException: Cannot serialize; nested exception is org.springframework.core.serializer.support.SerializationFailedException: Failed to serialize object using DefaultSerializer; nested exception is java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable payload but received an object of type [com.mogoroom.service.vo.criteria.QueryBSPromotionListVO]at org.springframework.data.redis.serializer.JdkSerializationRedisSerializer.serialize(JdkSerializationRedisSerializer.java:52)at org.springframework.data.redis.core.AbstractOperations.rawHashValue(AbstractOperations.java:146)at org.springframework.data.redis.core.DefaultHashOperations.putAll(DefaultHashOperations.java:128)at org.springframework.data.redis.core.DefaultBoundHashOperations.putAll(DefaultBoundHashOperations.java:85)at org.springframework.session.data.redis.RedisOperationsSessionRepository$RedisSession.saveDelta(RedisOperationsSessionRepository.java:778)at org.springframework.session.data.redis.RedisOperationsSessionRepository$RedisSession.access$000(RedisOperationsSessionRepository.java:670)at org.springframework.session.data.redis.RedisOperationsSessionRepository.save(RedisOperationsSessionRepository.java:388)at org.springframework.session.data.redis.RedisOperationsSessionRepository.save(RedisOperationsSessionRepository.java:245)at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.commitSession(SessionRepositoryFilter.java:245)at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.access$100(SessionRepositoryFilter.java:217)at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:170)at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at java.lang.Thread.run(Thread.java:745)Caused by: org.springframework.core.serializer.support.SerializationFailedException: Failed to serialize object using DefaultSerializer; nested exception is java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable payload but received an object of type [com.mogoroom.service.vo.criteria.QueryBSPromotionListVO]at org.springframework.core.serializer.support.SerializingConverter.convert(SerializingConverter.java:67)at org.springframework.core.serializer.support.SerializingConverter.convert(SerializingConverter.java:34)at org.springframework.data.redis.serializer.JdkSerializationRedisSerializer.serialize(JdkSerializationRedisSerializer.java:50)… 29 moreCaused by: java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable payload but received an object of type [com.mogoroom.service.vo.criteria.QueryBSPromotionListVO]at org.springframework.core.serializer.DefaultSerializer.serialize(DefaultSerializer.java:41)at org.springframework.core.serializer.support.SerializingConverter.convert(SerializingConverter.java:62)… 31 more
问题
spring session 异常信息没有打印到日志中 用是默认jdk序列化。由于实体没有序列话，导致异常，但是没有输入到日志，导致定位到问题。
在代码中 request.getSession().setAttribute()是不会出现异常的 spring session 一次请求返回的时候，才会commit,才会触发spring session提交。
代码如下：onResponseCommitted
/** * Allows ensuring that the session is saved if the response is committed. * * @author Rob Winch * @since 1.0 */ private final class SessionRepositoryResponseWrapper extends OnCommittedResponseWrapper { private final SessionRepositoryRequestWrapper request; /** * Create a new {@link SessionRepositoryResponseWrapper}. * @param request the request to be wrapped * @param response the response to be wrapped */ SessionRepositoryResponseWrapper(SessionRepositoryRequestWrapper request, HttpServletResponse response) { super(response); if (request == null) { throw new IllegalArgumentException("request cannot be null"); } this.request = request; } @Override protected void onResponseCommitted() { this.request.commitSession(); } } OnCommittedResponseWrapper abstract class OnCommittedResponseWrapper extends HttpServletResponseWrapper { /** * Calls <code>onResponseCommmitted()</code> with the current contents as long as * {@link #disableOnResponseCommitted()} was not invoked. */ private void doOnResponseCommitted() { if (!this.disableOnCommitted) { onResponseCommitted(); disableOnResponseCommitted(); } } }
doOnResponseCommitted相关依赖出发方法
解决方法
filter抓下日志
chain.doFilter(wrappedRequest, response); }catch (Exception ex){logger.error("xxf",ex);}
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
世上没有绝望的处境，只有对处境绝望的人。
