先說解決辦法
配置屬性：
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
解釋原因：
新創建的項目沒有配置數據源 所以在項目啟動的時候回去查找項目的數據源，但是發現找不到所以報錯。
如果配置了數據源之后 就算是沒有排除自動配置數據源
項目也是可以啟動成功的
springboot創建項目后運行報錯【Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.】
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