you can add @ComponentScan without any arguments. All of your application components ( @Component, @Service, @Repository, @Controller etc.) are automatically registered as Spring Beans
The following example shows a @Service Bean that uses constructor injection to obtain a required RiskAssessor bean:
package com.example.service; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; @Service public class DatabaseAccountService implements AccountService { private final RiskAssessor riskAssessor; @Autowired public DatabaseAccountService(RiskAssessor riskAssessor) { this.riskAssessor = riskAssessor; } // ... }If a bean has one constructor, you can omit 省略 the @Autowired, as shown in the following example:
只要我们只提供了一个构造函数，并且构造函数所需要的参数都在Spring容器中，那么不需要进行精确的指定使用@Autowired
@Service public class DatabaseAccountService implements AccountService { private final RiskAssessor riskAssessor; public DatabaseAccountService(RiskAssessor riskAssessor) { this.riskAssessor = riskAssessor; } // ... }
