Spring Boot相关组件的添加

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在勾选相关组件后，

pom.xml文件上发生了根本的变化

1、这是最简单的项目的pom文件

pom.xml

这是勾选了web、mongodb、mybatis、redis等的项目的pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <groupId>com.xxxxxx.spiderplatform</groupId>
<artifactId>spidercontroller</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging> <name>spidercontroller</name>
<description>content supportor</description> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.2.RELEASE</version>
<relativePath/> 
</parent> <properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties> <dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency> <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies> <build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build></project>

pom.xml

对比两个pom文件，会发现，勾选组建后的项目在dependencies中内容有了主要添加

然后运行添加组建后的文件，会报错：

Description:Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
//无法配置数据库，没有指定url属性，并且无法配置embedded datasource
Reason: Failed to determine a suitable driver class
//原因：无法明确指定正确的驱动类（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).//建议：
//如果如果需要加载嵌入式的数据库，请将他放入路径中
//如果有数据库设置需要从指定配置文件中加载，需要调用该配置文件（目前没有活动的配置文件）

分析：

通过比较两个项目结构，和修改的文件，会发现只因为有pom文件的修改导致项目中增加的mysql、redis、es、mongodb的依赖包的导入，需要添加新的database配置文件，可能因为springboot的启动会自动加载这些依赖启动时候需要的以来文件。

结果：

报错的原因是因为导入的两个依赖

这两个依赖的导入需要有他们支持的相关的配置文件

web 、 mybatis