如何在構造函數中爲不是Spring的對象使用autowired參數？

Question

我有一個問題，其中一些代碼使用Spring bean，還有一些常規POJO。

我試圖將一個bean（數據源）注入到POJO的構造函數（POJO是一個道）。

的代碼看起來是這樣的，近似爲：

public class MyAppClass { 
    public static void main(String[] args) { 
     // xxx 
       AnnotationConfigApplicationContext context = loadSpringConfiguration(); 
     SetupDaos setupDaosInstance = new SetupDAOs(); 
     setupDaosInstance.setupDAOs(); // This is where DAO constructors live 
    } 

public class SetupDAOs { 
    public static DaoType dao1; 
    // There is a reason why dao1 isn't a bean, that aren't obvious from minimal example 
    // Please don't post answers saying 
    // "you have an X-Y problem, convert dao1 into a bean" 

    public void setupDAOs() { 
     dao1 = new DaoType(); // We don't pass datasource here, 
    } 
} 

public class DaoType extends JdbcTemplate { 
    // This is where trouble starts 
    @Autowired ComboPooledDataSource dataSource; 

    // PROBLEM! Inside the constructor, "dataSource" isn't autowired yet! 
    public DaoType() { 
     super(); 
     setDataSource(dataSource); 
    } 
}  

// And in one of the Bean config classes 
    @Bean 
    public ComboPooledDataSource loadDataSource() throws Exception { 

上面的代碼不工作（數據源是null），因爲根據this Q&A，

自動裝配（從沙丘評論鏈接）發生在建造物體之後。

如果「具有Dao1」必須保持作爲一個POJO，而不是成爲一個春天創建豆，是有什麼辦法妥善能以某種方式注入自動裝配Autowired豆「數據源」到它的構造？

Answer 1

薪火DataSource左右，像這應該工作：

public static void main(String[] args) { 
    AnnotationConfigApplicationContext context = loadSpringConfiguration(); 
    Datasource dataSource = context.getBean(DataSource.class); 
    SetupDaos setupDaosInstance = new SetupDAOs(dataSource); 
    setupDaosInstance.setupDAOs(); 
} 

看到https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/context/support/AbstractApplicationContext.html#getBean-java.lang.Class-