springboot 取消starter的自動注入

starer是spring boot中一個很重要的概念，starter相當(dāng)于一個模塊，它能將所需要的的依賴整合在一起并對模塊內(nèi)的bean自動裝配到spring IOC容器，使用者只需要在maven中依賴相應(yīng)的starter包并無需做過多的依賴即可進(jìn)行開發(fā)。

看例子

比如，我們導(dǎo)入了mybatis相關(guān)的依賴，但是我可能暫時沒用到數(shù)據(jù)庫，所以就沒有做數(shù)據(jù)庫相關(guān)的配置，這時候項(xiàng)目就會無法啟動

2020-03-08 22:13:10.396 WARN 10692 --- [ main] ConfigServletWebServerApplicationContext : 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

因?yàn)閟pringboot中默認(rèn)的數(shù)據(jù)庫連接池是hikari，你沒有在application.properties里面進(jìn)行數(shù)據(jù)庫相關(guān)的配置的話，那么就會無法自動裝載dataSource

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]

重點(diǎn)來了

如何取消相關(guān)starer的自動注入？

我們還是以數(shù)據(jù)庫的這個為例子：

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)

那么，就需要在啟動類加上如上配置，取消DataSourceAutoConfiguration的自動注入

springbootApplication是一個組合注解，其實(shí)里面真正實(shí)現(xiàn)自動注入功能的，是這個EnableAutoConfiguration注解

SpringBoot 自動注入問題

Description:

Field service in com.test.controller.UserController required a bean of type 'com.test.service.UserService' that could not be found.

Action:

Consider defining a bean of type 'com.test.service.UserService' in your configuration.

項(xiàng)目啟動的時候出現(xiàn)出現(xiàn)問題

run

controller

service

dao

配置文件如下

項(xiàng)目目錄

找了幾個類，該注解的也注解了。

以上為個人經(jīng)驗(yàn)，希望能給大家一個參考，也希望大家多多支持腳本之家。

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