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本篇內容介紹了“spring-session自定義序列化方法是什么”的有關知識，在實際案例的操作過程中，不少人都會遇到這樣的困境，接下來就讓小編帶領大家學習一下如何處理這些情況吧！希望大家仔細閱讀，能夠學有所成！
spring-session默認采用jdk序列化方法，該方法效率低下、內存占用大，且需要額外修改代碼。故需要自定義序列化方法
首先需要一個類作為序列化的工具，需要實現
RedisSerializer
該接口在反序列化時沒有提供對應的class對象，因此使用jackson反序列化時，都會返回成Object對象
因此我的解決思路是，在序列化時，獲取對應bean的class，將其和bean序列化后的結果一并返回，存入redis
反序列化時，首先將byte數組轉化成字符串，在從中截取存入的class字符串，作為參數傳入jackson反序列化方法中
問題：對于帶有泛型的bean，無法將其轉化成真正適合的類型
解決方案：對于list，map，set等集合類，獲取其第一個元素的class，存入redis
缺點：要求集合類元素必須是同一個子類，不能來自于同一個父類
問題：spring-session在刪除attribute時，并沒有真正從redis中刪除，只是將value置為null，此時也會調用該類做序列化
解決方案：查看spring-session源碼得知，對于null值得處理方法為直接返回一個個數為0的byte數組，反序列化時直接返回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("<(.*)>");
}
/**
* 獲取class，包含集合類的泛型
* <p>暫只支持最多兩個泛型，同時集合內數據必須為同一個實現類，不可將泛型聲明成父類</p>
*
* @param obj 將要序列化的對象
* @return 沒有泛型，形式為java.lang.String<>
* <p>一個泛型，形式為java.lang.String<java.lang.String></p>
* <p>兩個個泛型，形式為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;//已被刪除的session
try {
String temp = new String(bytes, BaseStatic.CHARSET);
String cl[] = getClass(temp);
if (cl == null) {
throw new RuntimeException("錯誤的序列化結果=" + 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，獲取class
* <p>一個類型,java.lang.String<>={}</p>
* <p>兩個類型，后面為泛型,java.lang.String<java.lang.String>={}</p>
* <p>三個類型，后面為泛型,java.lang.String<java.lang.String,java.lang.String>={}</p>
*
* @param value 包含class的字符串
* @return 返回所有類的數組
*/
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()) {//沒有泛型
return new String[]{value.substring(0, index)};
} else if (temp.contains(classSeparator)) {//兩個泛型
int nextIndex = temp.indexOf(classSeparator);
return new String[]{
value.substring(0, index),
temp.substring(0, nextIndex),
temp.substring(nextIndex + 1)
};
} else {//一個泛型
return new String[]{
value.substring(0, index),
temp
};
}
}
}
return null;
}
}在之前的配置文件上進行修改
<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="${redis.database}"/>
<property name="usePool" value="true"/>
<property name="poolConfig" ref="redisPoolConfig"/>
</bean>
<bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">
<property name="connectionFactory" ref="jedisConnectionFactory"/>
<property name="defaultSerializer" ref="springSessionDefaultRedisSerializer"/>
<!--指定序列化類-->
<property name="valueSerializer" ref="springSessionDefaultRedisSerializer"/>
<property name="hashValueSerializer" ref="springSessionDefaultRedisSerializer"/>
</bean>嚴重: Servlet.service() for servlet [spring] in context with path [/] threw exception
org.springframework.data.redis.serializer.SerializationException: Cannot serialize; nested exception is org.springframework.core.serializer.support.SerializationFailedException: Failed to serialize object using DefaultSerializer; nested exception is java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable payload but received an object of type [com.mogoroom.service.vo.criteria.QueryBSPromotionListVO]
at org.springframework.data.redis.serializer.JdkSerializationRedisSerializer.serialize(JdkSerializationRedisSerializer.java:52)
at org.springframework.data.redis.core.AbstractOperations.rawHashValue(AbstractOperations.java:146)
at org.springframework.data.redis.core.DefaultHashOperations.putAll(DefaultHashOperations.java:128)
at org.springframework.data.redis.core.DefaultBoundHashOperations.putAll(DefaultBoundHashOperations.java:85)
at org.springframework.session.data.redis.RedisOperationsSessionRepository$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 more
Caused 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
spring session 異常信息沒有打印到日志中 用是默認jdk序列化。由于實體沒有序列話，導致異常，但是沒有輸入到日志，導致定位到問題。
在代碼中 request.getSession().setAttribute()是不會出現異常的 spring session 一次請求返回的時候，才會commit,才會觸發spring session提交。
代碼如下：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相關依賴出發方法
filter抓下日志
chain.doFilter(wrappedRequest, response);
}catch (Exception ex){
logger.error("xxf",ex);
}“spring-session自定義序列化方法是什么”的內容就介紹到這里了，感謝大家的閱讀。如果想了解更多行業相關的知識可以關注億速云網站，小編將為大家輸出更多高質量的實用文章！
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