spring 的依赖注入

首先 定义一个须要注入注入的bean HelloApi，通过spring来注入接口对象。

public class HelloApi
{

    private IMyFirstService myfirstService;

    public HelloApi()
    {
    };

    public HelloApi(IMyFirstService myFirstService)
    {
        this.myfirstService = myFirstService;
    }

    public void setMyfirstService(IMyFirstService myfirstService)
    {
        this.myfirstService = myfirstService;
    }

    
    public IMyFirstService getMyfirstService()
    {
        return myfirstService;
    }

    public String sayHello()
    {
        System.out.println(myfirstService.sayHello());
        return null;
    }

}
public