Failed to configure a DataSource: 'url' attribute is not specified and no embedded的解决办法

报错如下：

***************************
APPLICATION FAILED TO START
***************************
Description:
 
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
 
Reason: Failed to determine a suitable driver class
 
Action:
 
Consider the following:
    If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
    If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).

这个错误的大概意思是：配置DataSource失败，连接数据库的url属性没有指定和没有配置内嵌的数据源

问题原因: Mybatis没有找到合适的加载类,其实是大部分spring - datasource - url没有加载成功,分析原因如下所示.

1. DataSourceAutoConfiguration会自动加载.

2. 没有配置spring - datasource - url 属性.

3. spring - datasource - url 配置的地址格式有问题.

4. 配置 spring - datasource - url的文件没有加载.

关于这个问题，我的解决办法是赋值以前对的数据源和修改相关依赖：

为pom.xml文件中添加的依赖：

<!-- jdbc -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- 数据库驱动 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

修改配置文件中的属性信息：

server.port=8081
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/javaee?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone = GMT
spring.datasource.username=root
spring.datasource.password=root
mybatis.type-aliases-package=com.simple.test.pojo

在配置这两个文件后，启动项目就没有问题了。

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文件参考：

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Failed to configure a DataSource: 'url' attribute is not specified and no embedded 的三种解决办法