1. Autowire可以让你隐式地注入依赖.(it internally uses setter or constructor injection)
2.优点:减少代码量.
3.缺点:无法被程序员控制. 不能用在基本数据类型和string值.
4. Autowiring Modes模式
| 1) | no | It is the default autowiring mode. It means no autowiring bydefault. |
| 2) | byName | The byName mode injects the object dependency according to name of the bean. In such case, property name and bean name must be same. It internally calls setter method. |
| 3) | byType | The byType mode injects the object dependency according to type. So property name and bean name can be different. It internally calls setter method. |
| 4) | constructor | The constructor mode injects the dependency by calling the constructor of the class. It calls the constructor having large number of parameters. |
| 5) | autodetect | It is deprecated since Spring 3. |
byName和byType在另一片随笔中.
原文：https://www.cnblogs.com/zienzir/p/9126078.html