spring boot项目启动报DataSource错误

初建一个简单的spring boot 项目，启动后会报错。 

Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class
2019-01-27 14:36:35.101  INFO 5484 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
2019-01-27 14:36:35.104  INFO 5484 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2019-01-27 14:36:35.116  INFO 5484 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-01-27 14:36:35.123 ERROR 5484 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
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).


Process finished with exit code 1

报错信息说明的很详细：就是在项目启动的时候在 resource目录下没有加载到配置信息；如果项目只是想简单的启动运行，不进行数据库操作可以在 启动类上做如下处理便可解决。

 

• @SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})

• 如果对数据库操作有要求的话在application文件中加入配置

• spring:
    datasource:
      url: jdbc:mysql://localhost:3306/数据库名称?useUnicode=true&characterEncoding=UTF-8&useSSL=false
      username: 数据库用户名
      password: 数据库密码
      # 如果在pom 文件中没有依赖数据库连接这个会报红，加入 ‘mysql-connector-java’ 即可，如果还是报红的话，给出 8.0.13 具体版本号即可，如果还是不行，可能是其他引入的spring相关 jar 包的 pom 坐标依赖有冲突，删除即可。但是在启动后后台打印日志会报红
  #《Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is #`com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual #loading of the driver class is generally unnecessary.》
  # 把驱动名称：com.mysql.jdbc.Driver 换成 com.mysql.cj.jdbc.Driver 即可
      driver-class-name: com.mysql.jdbc.Driver
  
  
  spring:
    datasource:
      url: jdbc:mysql://localhost:3306/数据库名称?useUnicode=true&characterEncoding=UTF-8&useSSL=false
      username: 数据库用户名
      password: 数据库密码
      driver-class-name: com.mysql.cj.jdbc.Driver

• 数月之后重新用STS工具搭建项目后发现：

无故报错，并且启动后就刚才的问题做出配置后依然得不到解决。 但是用idea同样的版本却没有问题。我也不知道为啥

 这是pom文件对比

• 在spring xml配置文件中引用了数据库地址 所以需要对:等进行转义处理.但是在application.properties/或者application.yml文件并不需要转义,错误和正确方法写在下面了.

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

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

• 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.

    
        src/main/java
        
            **/*.yml
            **/*.properties
            **/*.xml
        
        false
    
    
        src/main/resources
        
            **/*.yml
            **/*.properties
            **/*.xml
        
        false
    

如果是：

com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.

加上 &serverTimezone=UTC 即可 。如：

com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.

# 解决方案
druid.jdbcUrl=jdbc:mysql://localhost:3306/ssm?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC

链接：https://www.jianshu.com/p/836d455663da