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                # 17. Spring Beans和依賴注入 ### 17. Spring Beans和依賴注入 你可以自由地使用任何標準的Spring框架技術去定義beans和它們注入的依賴。簡單起見,我們經常使用`@ComponentScan`注解搜索beans,并結合`@Autowired`構造器注入。 如果遵循以上的建議組織代碼結構(將應用的main類放到包的最上層,即root package),那么你就可以添加`@ComponentScan`注解而不需要任何參數,所有應用組件(`@Component`, `@Service`, `@Repository`, `@Controller`等)都會自動注冊成Spring Beans。 下面是一個`@Service` Bean的示例,它使用構建器注入獲取一個需要的`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; } // ... } ``` **注** 注意使用構建器注入允許`riskAssessor`字段被標記為`final`,這意味著`riskAssessor`后續是不能改變的。
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