java - Spring DI 与构造函数

Question

我有以下代码:

@Component
public class MainBean {

    @Autowired
    private MyTask myTask

    @Autowired
    private TaskScheduler taskScheduler


    public void start() {

        String str = "Print something to console";

        //somehow call constructor and pass str argument??
        taskScheduler.execute(myTask);

    }
}

@Component
public class MyTask implements Runnable {

    private String str;

    @Autowired
    public MyTask(String str) {
        this.str = str;
    }

    @Override
    public void run() {

        System.out.println(str);
    }
}

我想调用 MyTask 并将 str 参数传递给构造函数。我怎样才能做到这一点？我在任何地方都找不到任何好的例子。

Answer 1

如果我正确理解你想要做什么，一个好的解决方案如下:

@Component
public class MainBean {

    @Autowired
    private MyTaskFactory myTaskFactory

    @Autowired
    private TaskScheduler taskScheduler


    public void start() {

        String str = "Print something to console";

        taskScheduler.execute(myTaskFactory.getTask(str));

    }
}


public class MyTaskFactory {

   public MyTask getTask(String str) {
       return new MyTask(str);
   }
}

@Configuration
public class MyTaskFactoryConfig {

   @Bean
   public MyTaskFactory myTaskFactory() {
      return new MyTaskFactory();
   }
}

请注意，MyTask 将更改为:

public class MyTask implements Runnable {

    private String str;

    public MyTask(String str) {
        this.str = str;
    }

    @Override
    public void run() {

        System.out.println(str);
    }
}