Failed to configure a DataSource: 'url' attribute is not specified and no embedde

springboot启动报错
Failed to configure a DataSource: ‘url’ attribute is not specified and no embedde
原因分析

	DataSourceAutoConfiguration会自动加载.
	没有配置spring - datasource - url 属性.
	spring - datasource - url 配置的地址格式有问题.
	配置 spring - datasource - url的文件没有加载.

解决方案：

1.@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
2.配置application.yml/application.properties数据库信息
3.数据库信息没有转义处理，进行转义即可
4.yml或者properties文件没有被扫描到,需要在pom文件中<build></build>添加如下.来保证文件都能正常被扫描到并且加载成功.
<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.yml</include>
            <include>**/*.properties</include>
            <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
    </resource>
    <resource>
        <directory>src/main/resources</directory>
        <includes>
            <include>**/*.yml</include>
            <include>**/*.properties</include>
            <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
    </resource>
</resources>

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