springboot项目启动报错Failed to configure a DataSource: 'url' attribute is not specified and no embedde

创建springboot项目后启动，报错为

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.

2019-09-26 09:54:41.640 ERROR 4392 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************

APPLICATION FAILED TO START

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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).

问题分析及解决方案

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.

方案一 (解决原因1)

排除此类的autoconfig。启动以后就可以正常运行。

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)

方案二 (解决原因2)

在application.properties/或者application.yml文件中没有添加数据库配置信息.

spring:

  datasource:

    url: jdbc:mysql://localhost:3306/read_data?useUnicode=true&characterEncoding=UTF-8&useSSL=false

    username: root

    password: 123456

    driver-class-name: com.mysql.jdbc.Driver

方案三(解决原因3)

spring.datasource.url = jdbc:mysql://192.168.0.20:1504/f_me?setUnicode=true&characterEncoding=utf8

方案四 (解决原因4)

yml或者properties文件没有被扫描到,需要在pom文件中添加如下.来保证文件都能正常被扫描到并且加载成功.

<!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 -->

<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>

以上方法，任选其一就行