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關(guān)于session共享的方式有多種:

(1)通過(guò)nginx的ip_hash，根據(jù)ip將請(qǐng)求分配到對(duì)應(yīng)的服務(wù)器

(2)基于關(guān)系型數(shù)據(jù)庫(kù)存儲(chǔ)

(3)基于cookie存儲(chǔ)

(4)服務(wù)器內(nèi)置的session復(fù)制域

(5)基于nosql（memcache、redis都可以）

　　常用的就是1和5，下面研究第5種方式，基于nosql存儲(chǔ)session。

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　　其實(shí)實(shí)現(xiàn)原理也比較簡(jiǎn)單，在所有的請(qǐng)求之前配置一過(guò)濾器，在請(qǐng)求之前操作session，其實(shí)spring-session中真正起作用的session過(guò)濾器是:SessionRepositoryFilter。spring-session集成了redis與mongodb。

===========session存到redis中的研究==========

1.添加maven依賴

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>cn.qlq</groupId>    <artifactId>sessionDemo</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>war</packaging>    <dependencies>        <dependency>            <groupId>org.springframework.session</groupId>            <artifactId>spring-session-data-redis</artifactId>            <version>1.2.1.RELEASE</version>        </dependency>        <dependency>            <groupId>redis.clients</groupId>            <artifactId>jedis</artifactId>            <version>2.8.1</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-web</artifactId>            <version>4.2.5</version>        </dependency>        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>servlet-api</artifactId>            <version>2.5</version>            <scope>provided</scope>        </dependency>        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>jsp-api</artifactId>            <version>2.0</version>            <scope>provided</scope>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>                <configuration>                    <source>1.7</source>                    <target>1.7</target>                    <encoding>UTF-8</encoding>                </configuration>            </plugin>            <!-- tomcat7插件 -->            <plugin>                <groupId>org.apache.tomcat.maven</groupId>                <artifactId>tomcat7-maven-plugin</artifactId>                <version>2.2</version>                <configuration>                    <port>88</port>                    <path>/sess</path>                    <uriEncoding>UTF-8</uriEncoding>                    <server>tomcat7</server>                </configuration>            </plugin>        </plugins>    </build></project>

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2.web.xml添加過(guò)濾器

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns="http://java.sun.com/xml/ns/javaee"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"    version="2.5">    <display-name>sessionDemo</display-name>    <welcome-file-list>        <welcome-file>index.jsp</welcome-file>    </welcome-file-list>    <!--Spring配置 -->    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath:springMVC.xml</param-value>    </context-param>    <!-- Spring監(jiān)聽(tīng)器 -->    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    </listener>    <filter>        <filter-name>springSessionRepositoryFilter</filter-name>        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>    </filter>    <filter-mapping>        <filter-name>springSessionRepositoryFilter</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping></web-app>

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3.springMVC.xml配置bean

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:aop="http://www.springframework.org/schema/aop"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd ">    <!--1.掃描controller注解(只是掃描@Controller) -->    <context:component-scan base-package="cn" />    <bean id="redisHttpSessionConfiguration"        class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">        <property name="maxInactiveIntervalInSeconds" value="600" />    </bean>    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">        <property name="maxTotal" value="100" />        <property name="maxIdle" value="10" />    </bean>    <bean id="jedisConnectionFactory"        class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"        destroy-method="destroy">        <property name="hostName" value="127.0.0.1" />        <property name="port" value="6379" />        <property name="timeout" value="3000" />        <property name="usePool" value="true" />        <property name="poolConfig" ref="jedisPoolConfig" />    </bean></beans>

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4.index.jsp簡(jiǎn)單的讀取一下sessioid

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>    jsessionid=${pageContext.session.id}    <br />    <%=request.getRealPath("/")%></body></html>

結(jié)果:

啟動(dòng)tomcat訪問(wèn)之后查看頁(yè)面:

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可視化界面查看redis庫(kù)中的數(shù)據(jù):

redis中的key:

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可視化界面中查看:

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?在redis中通過(guò)flushall清空所有數(shù)據(jù)之后再次刷新界面發(fā)現(xiàn)重新生成sessionid，確實(shí)是與redis中session同步。

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補(bǔ)充:這里需要注意，如果需要在session中存bean的話，bean需要實(shí)現(xiàn)Serializable接口。

例如:

package sessionDemo;import java.io.Serializable;public class User implements Serializable {    /**     *      */    private static final long serialVersionUID = -5654418863461227475L;    private String username;    private int age;    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public static long getSerialversionuid() {        return serialVersionUID;    }    public User(String username, int age) {        super();        this.username = username;        this.age = age;    }}

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修改頁(yè)面:

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ page import="sessionDemo.*"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>    <%        request.getSession().setAttribute("user", new User("zs", 5));    %>    jsessionid=${pageContext.session.id}        <br />    ${user.username}    <br />    <%=request.getRealPath("/")%></body></html>

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訪問(wèn)頁(yè)面查看效果:

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查看redis:

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源碼地址:https://github.com/qiao-zhi/spring-session-redis

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?補(bǔ)充:關(guān)于org.springframework.web.filter.DelegatingFilterProxy過(guò)濾器的使用

?　　DelegatingFilterProxy就是一個(gè)對(duì)于servlet filter的代理，用這個(gè)類的好處主要是通過(guò)Spring容器來(lái)管理servlet filter的生命周期，還有就是如果filter中需要一些Spring容器的實(shí)例，可以通過(guò)spring直接注入，另外讀取一些配置文件這些便利的操作都可以通過(guò)Spring來(lái)配置實(shí)現(xiàn)。

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DelegatingFilterProxy的使用方法:

首先在web.xml中配置：

<filter>< filter-name>filterName</filter-name>< filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class></filter><filter-mapping>< filter-name>filterName</filter-name>< url-pattern>/*</url-pattern></filter-mapping>

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然后在Spring的配置文件中，配置具體的Filter類的實(shí)例。

<bean name="filterName" class="com.*.Filter"></bean>

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在Spring中配置的bean的name要和web.xml中的<filter-name>一樣

或者在DelegatingFilterProxy的filter配置中配置初始參數(shù)：targetBeanName，對(duì)應(yīng)到Spring配置中的beanname

如果要保留Filter原有的init，destroy方法的調(diào)用，還需要配置初始化參數(shù)targetFilterLifecycle為true，該參數(shù)默認(rèn)為false

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在上面session的過(guò)濾器使用中，我們?cè)趙eb.xml中配置的filter的name為:springSessionRepositoryFilter,所以spring容器中應(yīng)該有bean為springSessionRepositoryFilter的過(guò)濾器。查閱源碼發(fā)現(xiàn)如下:SpringHttpSessionConfiguration 類中。(下面是spring4.0提倡的java配置方式，方法的名稱就是bean的name,@Bean生命一個(gè)bean)

    @Bean    public <S extends ExpiringSession> SessionRepositoryFilter<? extends ExpiringSession> springSessionRepositoryFilter(            SessionRepository<S> sessionRepository) {        SessionRepositoryFilter<S> sessionRepositoryFilter = new SessionRepositoryFilter<S>(                sessionRepository);        sessionRepositoryFilter.setServletContext(this.servletContext);        if (this.httpSessionStrategy instanceof MultiHttpSessionStrategy) {            sessionRepositoryFilter.setHttpSessionStrategy(                    (MultiHttpSessionStrategy) this.httpSessionStrategy);        }        else {            sessionRepositoryFilter.setHttpSessionStrategy(this.httpSessionStrategy);        }        return sessionRepositoryFilter;    }

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========結(jié)合nginx實(shí)現(xiàn)集群 session共享========

1.配置nginx集群

　　注意下面紅色部分的配置，nginx監(jiān)聽(tīng)84端口，采用權(quán)重的方式分別分發(fā)到本機(jī)的85端口和86端口。85端口和86端口分別啟動(dòng)兩個(gè)tomcat并且部署上面的項(xiàng)目。

#user  nobody;worker_processes  1;#error_log  logs/error.log;#error_log  logs/error.log  notice;#error_log  logs/error.log  info;#pid        logs/nginx.pid;events {    worker_connections  1024;}http {    include       mime.types;    default_type  application/octet-stream;    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '    #                  '$status $body_bytes_sent "$http_referer" '    #                  '"$http_user_agent" "$http_x_forwarded_for"';    #access_log  logs/access.log  main;    sendfile        on;    #tcp_nopush     on;    #keepalive_timeout  0;    keepalive_timeout  65;    #gzip  on;    server {        listen       84;        server_name  localhost;        #charset koi8-r;        #access_log  logs/host.access.log  main;        location / {               proxy_connect_timeout   3;               proxy_send_timeout      30;               proxy_read_timeout      30;               proxy_pass http://clustername;        }        #error_page  404              /404.html;        # redirect server error pages to the static page /50x.html        #        error_page   500 502 503 504  /50x.html;        location = /50x.html {            root   html;        }        # proxy the PHP scripts to Apache listening on 127.0.0.1:80        #        #location ~ \.php$ {        #    proxy_pass   http://127.0.0.1;        #}        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000        #        #location ~ \.php$ {        #    root           html;        #    fastcgi_pass   127.0.0.1:9000;        #    fastcgi_index  index.php;        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;        #    include        fastcgi_params;        #}        # deny access to .htaccess files, if Apache's document root        # concurs with nginx's one        #        #location ~ /\.ht {        #    deny  all;        #}    }    # another virtual host using mix of IP-, name-, and port-based configuration    #    #server {    #    listen       8000;    #    listen       somename:8080;    #    server_name  somename  alias  another.alias;    #    location / {    #        root   html;    #        index  index.html index.htm;    #    }    #}    #集群配置：服務(wù)器列表    upstream clustername {      server 127.0.0.1:85 weight=1;#服務(wù)器配置      server 127.0.0.1:86 weight=1;#服務(wù)器配置    }    # HTTPS server    #    #server {    #    listen       443 ssl;    #    server_name  localhost;    #    ssl_certificate      cert.pem;    #    ssl_certificate_key  cert.key;    #    ssl_session_cache    shared:SSL:1m;    #    ssl_session_timeout  5m;    #    ssl_ciphers  HIGH:!aNULL:!MD5;    #    ssl_prefer_server_ciphers  on;    #    location / {    #        root   html;    #        index  index.html index.htm;    #    }    #}}

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測(cè)試:訪問(wèn)nginx的84端口，多次訪問(wèn)發(fā)現(xiàn)平均是一次85端口的tomcat、一次86端口的tomcat，并且其session不變，也就是兩個(gè)tomcat共用一個(gè)redis的session，實(shí)現(xiàn)了session共享。

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　　至此完成了redis spring-session實(shí)現(xiàn)了session共享，并且也簡(jiǎn)單的實(shí)現(xiàn)了結(jié)合nginx實(shí)現(xiàn)集群 session共享。

　　接下來(lái)還會(huì)研究shiro redis的session共享。

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關(guān)于nginx的ip_hash實(shí)現(xiàn)根據(jù)ip分發(fā)到對(duì)應(yīng)server，參考:https://www.cnblogs.com/qlqwjy/p/9833669.html

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