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public class ServletRequestWrapper implements ServletRequest {

private ServletRequest request;

/**
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*/
public ServletRequestWrapper(ServletRequest request) {
if (request == null) {
throw new IllegalArgumentException("Request cannot be null");
}
this.request = request;
}

public ServletRequest getRequest() {
return this.request;
}

public Object getAttribute(String name) {
return this.request.getAttribute(name);
}

// ΪÁ˱£Ö¤¿É¶ÁÐÔ£¬ÆäËûµÄ·½·¨É¾¼õµôÁË
}

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public class HttpServletRequestWrapper extends ServletRequestWrapper 
implements HttpServletRequest {

public HttpServletRequestWrapper(HttpServletRequest request) {
super(request);
}

private HttpServletRequest _getHttpServletRequest() {
return (HttpServletRequest) super.getRequest();
}

public HttpSession getSession(boolean create) {
return this._getHttpServletRequest().getSession(create);
}

public HttpSession getSession() {
return this._getHttpServletRequest().getSession();
}
// ΪÁ˱£Ö¤¿É¶ÁÐÔ£¬ÆäËûµÄ·½·¨É¾¼õµôÁË
}

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/*
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*/
private final class SessionRepositoryRequestWrapper
extends HttpServletRequestWrapper {

private HttpSessionWrapper currentSession;
private Boolean requestedSessionIdValid;
private boolean requestedSessionInvalidated;
private final HttpServletResponse response;
private final ServletContext servletContext;

/*
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*/
private SessionRepositoryRequestWrapper(
HttpServletRequest request,
HttpServletResponse response,
ServletContext servletContext) {
super(request);
this.response = response;
this.servletContext = servletContext;
}

/*
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*/
@Override
public HttpSession getSession(boolean create) {
if(currentSession != null) {
return currentSession;
}
String requestedSessionId = getRequestedSessionId();
if(requestedSessionId != null) {
S session = sessionRepository.getSession(requestedSessionId);
if(session != null) {
this.requestedSessionIdValid = true;
currentSession = new HttpSessionWrapper(session, getServletContext());
currentSession.setNew(false);
return currentSession;
}
}
if(!create) {
return null;
}
S session = sessionRepository.createSession();
currentSession = new HttpSessionWrapper(session, getServletContext());
return currentSession;
}

@Override
public HttpSession getSession() {
return getSession(true);
}
}

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/*
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* ËüµÄʵÏÖÀ©Õ¹ÁËÒ»¸öhelper»ùÀà¡£
*/
public class SessionRepositoryFilter < S extends ExpiringSession >
extends OncePerRequestFilter {

/*
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*/
protected void doFilterInternal(
HttpServletRequest request,
HttpServletResponse response,
FilterChain filterChain) throws ServletException, IOException {

request.setAttribute(SESSION_REPOSITORY_ATTR, sessionRepository);

SessionRepositoryRequestWrapper wrappedRequest =
new SessionRepositoryRequestWrapper(request,response,servletContext);

SessionRepositoryResponseWrapper wrappedResponse =
new SessionRepositoryResponseWrapper(wrappedRequest, response);

HttpServletRequest strategyRequest =
httpSessionStrategy.wrapRequest(wrappedRequest, wrappedResponse);

HttpServletResponse strategyResponse =
httpSessionStrategy.wrapResponse(wrappedRequest, wrappedResponse);

try {
filterChain.doFilter(strategyRequest, strategyResponse);
} finally {
wrappedRequest.commitSession();
}
}
}

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<groupId>org.springframework.session</groupId>
<artifactId>spring-session</artifactId>
<version>1.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-redis</artifactId>
</dependency>

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@SpringBootApplication
@EnableRedisHttpSession
public class ExampleApplication {

public static void main(String[] args) {
SpringApplication.run(ExampleApplication.class, args);
}
}

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spring.redis.host=localhost
spring.redis.password=secret
spring.redis.port=6379

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public class Example extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

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HttpSession session = request.getSession();
String value = session.getAttribute(a€?someAttributea€?);

}
}

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@WebServlet("/example")
public class Example extends HttpServlet {

@Override
protected void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException {

/*
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HttpSessionManager sessionManager=(HttpSessionManager)request.getAttribute(
"org.springframework.session.web.http.HttpSessionManager");

/*
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* ÀýÈ磬http://localhost:8080/example?_s=1
* ½«»áʹÈçϵĴúÂë´òÓ¡³ö¡°Requested Session Alias is: 1¡±
*/
String requestedSessionAlias=sessionManager.getCurrentSessionAlias(request);
System.out.println("Requested Session Alias is: " + requestedSessionAlias);

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String newSessionAlias = sessionManager.getNewSessionAlias(request);

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