分佈式Session共享（一）：tomcat+redis實現session共享

時間 2019-11-19

標籤分佈式 session 共享 tomcat+redis tomcat redis 實現欄目系統架構简体版

原文原文鏈接

1、前言

本文主要測試redis實現session共享的實現方式，不討論如何讓nginx參與實現負載均衡等。css

2、環境配置

本測試在Window下進行html

name	version	port
Tomcat1	7.0.61	127.0.0.1:8081
Tomcat2	7.0.61	127.0.0.1:8082
Redis	2.4.5	127.0.0.1:6379
jdk	1.7	-

-java

3、安裝tomcat-redis-session-manager插件

1.源碼下載： nginx

https://github.com/jcoleman/tomcat-redis-session-managergit

最新版源碼對jdk版本有要求，必須是JDk1.7，不然編譯通不過。github

以前我用的是Tomcat7與JDK1.6的組合，結果一直運行不了，拋出以下異常。redis

java.lang.UnsupportedClassVersionError: com/orangefunction/tomcat/redissessions/RedisSessionHandlerValve : Unsupported major.minor version 51.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)

at java.lang.ClassLoader.defineClass(ClassLoader.java:615)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)

at java.net.URLClassLoader.access$000(URLClassLoader.java:58)

at java.net.URLClassLoader$1.run(URLClassLoader.java:197)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

若是你想要兼容版本較低的Tomcat或者jdk，能夠嘗試下載其餘分支源碼，其餘分支我沒有進行測試，不知道兼容狀況如何。apache

2.或者Jar包下載：瀏覽器

https://github.com/jcoleman/tomcat-redis-session-manager/downloadstomcat

不少人都說Jar包有Bug，並不能真正的運行。我特地試了一下，確實不行，並且Jar包中的代碼目錄結構都與源碼不一致，多是包的版本太過老舊了，因此我仍是嘗試用源碼從新編譯生成Jar包。

3.從新編譯：

源碼構建基於 gradle，因此先要搭建gradle 環境，搭建很簡單。

3.1 下載Gradle，直接下載Complete distribution 版就能夠。

3.2 下載後解壓，而且設置環境變量。

GRADLE_HOME:E:\java\gradle-2.12-all\gradle-2.12（解壓目錄）

PATH:%GRADLE_HOME%\bin

3.3 cmd命令提示符中：輸入gradle -v 測試安裝成功與否

輸出代表安裝成功。

C:\Users\Administrator>gradle -v ------------------------------------------------------------ Gradle 2.12 ------------------------------------------------------------

Build time: 2016-03-14 08:32:03 UTC

Build number: none Revision: b29fbb64ad6b068cb3f05f7e40dc670472129bc0

Groovy: 2.4.4

Ant: Apache Ant(TM)

version 1.9.3 compiled on December 23 2013

JVM: 1.7.0_79 (Oracle Corporation 24.79-b02)

OS: Windows 7 6.1 amd64

3.4 修改源碼的build.gradle文件

因爲做者使用了第三方倉庫（sonatype），須要註冊賬號，太麻煩，註釋後直接使用maven中央倉庫，同時註釋簽名相關腳本並增長依賴包的輸出腳本 copyJars（dist目錄），修改後的 build.gradle 文件以下（紅色字體爲修改處）：

apply plugin: 'java'
apply plugin: 'maven'
apply plugin: 'signing'

group = 'com.orangefunction'
version = '2.0.0'

repositories {
  mavenLocal()
  mavenCentral()
}

compileJava {
  sourceCompatibility = 1.7
  targetCompatibility = 1.7
}

dependencies {
  compile group: 'org.apache.tomcat', name: 'tomcat-catalina', version: '7.0.61'
  compile group: 'redis.clients', name: 'jedis', version: '2.5.2'
  compile group: 'org.apache.commons', name: 'commons-pool2', version: '2.2'
  //compile group: 'commons-codec', name: 'commons-codec', version: '1.9'

  testCompile group: 'junit', name: 'junit', version: '4.+'
  testCompile 'org.hamcrest:hamcrest-core:1.3'
  testCompile 'org.hamcrest:hamcrest-library:1.3'
  testCompile 'org.mockito:mockito-all:1.9.5'
  testCompile group: 'org.apache.tomcat', name: 'tomcat-coyote', version: '7.0.61'
}

task javadocJar(type: Jar, dependsOn: javadoc) {
  classifier = 'javadoc'
  from 'build/docs/javadoc'
}

task sourcesJar(type: Jar) {
  from sourceSets.main.allSource
  classifier = 'sources'
}

artifacts {
  archives jar

  archives javadocJar
  archives sourcesJar
}

//signing {
//  sign configurations.archives
//}

task copyJars(type: Copy) {
  from configurations.runtime
  into 'dist'  
}

uploadArchives {
  repositories {
    mavenDeployer {
      beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }

     // repository(url: "https://oss.sonatype.org/service/local/staging/deploy/maven2/") {
     //   authentication(userName: sonatypeUsername, password: sonatypePassword)
     // }
      //repository(url: "https://oss.sonatype.org/content/repositories/snapshots") {
      //  authentication(userName: sonatypeUsername, password: sonatypePassword)
      //}

      pom.project {
        name 'tomcat-redis-session-manager'
        packaging 'jar'
        description 'Tomcat Redis Session Manager is a Tomcat extension to store sessions in Redis'
        url 'https://github.com/jcoleman/tomcat-redis-session-manager'

        issueManagement {
          url 'https://github.com:jcoleman/tomcat-redis-session-manager/issues'
          system 'GitHub Issues'
        }

        scm {
          url 'https://github.com:jcoleman/tomcat-redis-session-manager'
          connection 'scm:git:git://github.com/jcoleman/tomcat-redis-session-manager.git'
          developerConnection 'scm:git:git@github.com:jcoleman/tomcat-redis-session-manager.git'
        }

        licenses {
          license {
            name 'MIT'
            url 'http://opensource.org/licenses/MIT'
            distribution 'repo'
          }
        }

        developers {
          developer {
            id 'jcoleman'
            name 'James Coleman'
            email 'jtc331@gmail.com'
            url 'https://github.com/jcoleman'
          }
        }
      }
    }
  }
}

修改完成後，cmd進入源碼根目錄，執行構建命令從新構建項目