Spring Boot開啟的2種方式
Spring Boot依賴
使用Spring Boot很簡單,先新增基礎依賴包,有以下兩種方式
1. 繼承spring-boot-starter-parent專案
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.6.RELEASE</version> </parent>
2. 匯入spring-boot-dependencies專案依賴
<dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-dependencies</artifactId> <version>1.5.6.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> </dependencyManagement>
Spring Boot依賴注意點
1. 屬性覆蓋只對繼承有效
This only works if your Maven project inherits (directly or indirectly) from spring-boot-dependencies. If you have added spring-boot-dependencies in your own dependencyManagement section withimportyou have to redefine the artifact yourself instead of overriding the property.
Spring Boot依賴包裡面的元件的版本都是和當前Spring Boot繫結的,如果要修改裡面元件的版本,只需要新增如下屬性覆蓋即可,但這種方式只對繼承有效,匯入的方式無效。
<properties>
<slf4j.version>1.7.25<slf4j.version>
</properties>
如果匯入的方式要實現版本的升級,達到上面的效果,這樣也可以做到,把要升級的元件依賴放到Spring Boot之前。
<dependencyManagement>
<dependencies>
<!-- Override Spring Data release train provided by Spring Boot -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-releasetrain</artifactId>
<version>Fowler-SR2</version>
<scope>import</scope>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>1.5.6.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
Each Spring Boot release is designed and tested against a specific set of third-party dependencies. Overriding versions may cause compatibility issues.
需要注意,要修改Spring Boot的依賴元件版本可能會造成不相容的問題。
2. 資原始檔過濾問題
使用繼承Spring Boot時,如果要使用Maven resource filter過濾資原始檔時,資原始檔裡面的佔位符為了使${}和Spring Boot區別開來,此時要用@[email protected]包起來,不然無效。另外,@[email protected]佔位符在yaml檔案編輯器中編譯報錯,所以使用繼承方式有諸多問題,坑要慢慢趟。