AbstractRoutingDataSource动态数据源切换，AOP实现动态数据源切换

最近遇到后端访问多种数据源做记录！

pom.xml 

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.*.*</groupId>
    <artifactId>*</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>*</name>
    <packaging>pom</packaging>

    <modules>
        <module>*-base</module>
        <module>*-dao</module>
        <module>*-service</module>
        <module>*-web</module>
        <module>*-describe</module>
        <module>*-rengine</module>
    </modules>

    <properties>
        <java.version>1.8</java.version>
        <swagger2.version>2.7.0</swagger2.version>
        <log4j.version>1.2.17</log4j.version>
        <commons.collections.version>3.2.1</commons.collections.version>
        <commons.beanutils.version>1.8.3</commons.beanutils.version>
        <querydsl.version>4.1.4</querydsl.version>
        <poi.version>4.0.0</poi.version>
        <mysql.version>5.1.38</mysql.version>
        <mybatis-generator.version>1.3.7</mybatis-generator.version>
        <druid.version>1.1.10</druid.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid-spring-boot-starter -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>${druid.version}</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>${swagger2.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>guava</artifactId>
                    <groupId>com.google.guava</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>${swagger2.version}</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>com.querydsl</groupId>
            <artifactId>querydsl-mongodb</artifactId>
            <version