报错内容具体如下
*************************** 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).
其中Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
翻译就是：无法配置DataSource：未指定'url'属性，也无法配置嵌入数据源。
就是在应用中没有配置datasource的一些相关属性，例如：地址值，数据库驱动，用户名，密码
SpringBoot的最大一个好处就是自动配置：所以我们只是需要给他配置文件的值，它就会自动配置。配置在application.properties文件中，不过也可以不配置，但是需要声明一下
启动类头部声明就可以了：
具体操作如下
1.找到main下的Application.java文件
2.在该文件下的
@SpringBootApplication后添加
(exclude = DataSourceAutoConfiguration.class)
如下，然后重新启动项目就可以了
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}