创建一个MySQL数据库，新建一张users表，添加username和password字段

第七步、配置数据库认证

参考官方文档：https://apereo.github.io/cas/4.2.x/installation/Database-Authentication.html#database-components

首先拷贝MySQL驱动到cas-server-webapp项目的lib目录下

然后到下载的CAS源码的cas-server-support-jdbc目录下gradle build编译jdbc的支持jar包

编译好之后，同样到build》libs目录下拷贝cas-server-support-jdbc-4.2.7.jar包到cas-server-webapp项目的lib目录下

打开deployerConfigContext.xml配置文件

将<alias name="acceptUsersAuthenticationHandler" alias="primaryAuthenticationHandler" />这一行注释掉

加入

<alias name="queryDatabaseAuthenticationHandler" alias="primaryAuthenticationHandler" />
<alias name="dataSource" alias="queryDatabaseDataSource" />

<bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource"
p:driverClass="${database.driverClass}"
p:jdbcUrl="${database.url}"
p:user="${database.user}"
p:password="${database.password}"
p:initialPoolSize="${database.pool.minSize}"
p:minPoolSize="${database.pool.minSize}"
p:maxPoolSize="${database.pool.maxSize}"
p:maxIdleTimeExcessConnections="${database.pool.maxIdleTime}"
p:checkoutTimeout="${database.pool.maxWait}"
p:acquireIncrement="${database.pool.acquireIncrement}"
p:acquireRetryAttempts="${database.pool.acquireRetryAttempts}"
p:acquireRetryDelay="${database.pool.acquireRetryDelay}"
p:idleConnectionTestPeriod="${database.pool.idleConnectionTestPeriod}"
p:preferredTestQuery="${database.pool.connectionHealthQuery}" />