一、安装MongoDB4.0.3（××）
1.1、官方安装文档
https://docs.mongodb.com/manual/tutorial/install-mongodb-on-red-hat/
1.2、tar.gz包下载地址
https://www.mongodb.com/download-center/community?jmp=docs
1.3、复制集官方配置
https://docs.mongodb.com/manual/administration/replica-set-member-configuration/
二、SpringProject版本依赖（×）
Spring：5.1.1.RELEASE 以上
SpringDataMongoDB:2.1.1.RELEASE 以上
三、配置MongoTransactionManager（SpringBoot使用方式）
SpringBoot 集成非常简单，配置MongoTransastionManager，目前Spring-boot-starter-data-mongodb 版本较低不支持，因此暂未验证，SpringBoot配置复制集参考SpringBoot相关文档
@Configurationstatic class Config extends AbstractMongoConfiguration { @Bean MongoTransactionManager transactionManager(MongoDbFactory dbFactory) { return new MongoTransactionManager(dbFactory); } // ...} 四、配置MongoTransactionManager（普通Spring项目）
<context:property-placeholder location="classpath:mongo.properties" ignore-unresolvable="true" file-encoding="utf-8" /> <!-- 重点配置 1.安全配置：credentials="${mongo.user}:${mongo.password}@${mongo.database}" 2.单机配置：host="${mongo.host}" port="${mongo.port}" 3.副本集配置：replica-set="${mongo.replSet}" --> <mongo:mongo-client id="mongoClient" replica-set="${mongo.replSet}"> <mongo:client-options min-connections-per-host="${mongo.minConnectionsPerHost}" write-concern="SAFE" read-preference="NEAREST" threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}" connect-timeout="${mongo.connectTimeout}" max-wait-time="${mongo.maxWaitTime}" socket-keep-alive="${mongo.socketKeepAlive}" socket-timeout="${mongo.socketTimeout}" max-connection-idle-time="${mongo.maxConnectionIdleTime}" max-connection-life-time="${mongo.maxConnectionLifeTime}" heartbeat-socket-timeout="${mongo.heartbeatSocketTimeout}" heartbeat-connect-timeout="${mongo.heartbeatConnectTimeout}" min-heartbeat-frequency="${mongo.minHeartbeatFrequency}" heartbeat-frequency="${mongo.heartbeatFrequency}" /> </mongo:mongo-client> <mongo:db-factory id="mongoDbFactory" dbname="${mongo.database}" mongo-ref="mongoClient" /> <bean id="mappingContext" class="org.springframework.data.mongodb.core.mapping.MongoMappingContext" /> <bean id="defaultMongoTypeMapper" class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper"> <constructor-arg name="typeKey"> <null /> </constructor-arg> </bean> <bean id="mappingMongoConverter" class="org.springframework.data.mongodb.core.convert.MappingMongoConverter"> <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" /> <constructor-arg name="mappingContext" ref="mappingContext" /> <property name="typeMapper" ref="defaultMongoTypeMapper" /> </bean> <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"> <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" /> <constructor-arg name="mongoConverter" ref="mappingMongoConverter" /> </bean> <!-- 重点配置 --> <bean id="mongoTransactionManager" class="org.springframework.data.mongodb.MongoTransactionManager"> <constructor-arg name="dbFactory" ref="mongoDbFactory"/> </bean> <tx:annotation-driven transaction-manager="mongoTransactionManager" proxy-target-class="true"/> 五、使用事务（×）
@Servicepublic class StateService { @Autowired private MongoTemplate teplate; @Transactional void someBusinessFunction(Step step) { template.insert(step); log.debug(1/0); };}); 六、Mongo.properties 配置
mongo.host=192.168.1.66mongo.port=27017mongo.replSet=192.168.1.66:2000,192.168.1.66:2001,192.168.1.66:2002mongo.minConnectionsPerHost=10mongo.threadsAllowedToBlockForConnectionMultiplier=4mongo.connectTimeout=30000mongo.maxWaitTime=3000mongo.socketKeepAlive=falsemongo.socketTimeout=30000mongo.maxConnectionIdleTime=0mongo.maxConnectionLifeTime=0mongo.heartbeatSocketTimeout=20000mongo.heartbeatConnectTimeout=10000mongo.minHeartbeatFrequency=3000mongo.heartbeatFrequency=5000mongo.database=labsta
七、最后是重点（×××××）
7.1、必须使用复制集，单节点不支持，mongodb4.2 会支持分片集事务，复制集安装请自行研究
7.2、使用事务之前（@Transaction），数据库和文档必须提前创建，如何解决呢？且看下篇
7.3、Spring版本和SpringDataMongodb版本必须遵循 @SpringProject版本依赖
7.4、注意，此处的复制集不是4.0版本之前的主从复制集群，4.0之后已废弃主从模式
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