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                您可以自由地使用任何標準的Spring Framework技術來定義bean及其注入的依賴項.為簡單起見,我們經常發現使用`@ComponentScan`(找到你的bean)并使用`@Autowired`(做構造函數注入)效果很好。 如果像之前建議的那樣布局代碼(把application 類放在根包下),可以使用`@ComponentScan`不用任何參數,所有spring的組件(`@Component`, `@Service`, `@Repository`, `@Controller`等等)都會自動注冊為spring的bean. 下例展示了,`@service`bean通過構造方法注入`RiskAssessor` ~~~ 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; } // ... } ~~~ 如果bean只有一個構造方法,可省略`@Autowired`,如下所示: ~~~ @Service public class DatabaseAccountService implements AccountService { private final RiskAssessor riskAssessor; public DatabaseAccountService(RiskAssessor riskAssessor) { this.riskAssessor = riskAssessor; } // ... } ~~~ > 注意,標記屬性`riskAssessor`為`final`,表示隨后不可更改的 >
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