Spring提供了多种依赖注入(IoC)方式,以满足不同的应用场景和开发者的喜好。以下是Spring中常见的依赖注入方式:
public class MyService {
private MyDependency myDependency;
public MyService(MyDependency myDependency) {
this.myDependency = myDependency;
}
}
public class MyService {
private MyDependency myDependency;
public void setMyDependency(MyDependency myDependency) {
this.myDependency = myDependency;
}
}
public interface DependencyInjector {
void injectDependency(MyService target);
}
public class MyService implements DependencyInjector {
private MyDependency myDependency;
@Override
public void injectDependency(MyService target) {
target.setMyDependency(myDependency);
}
}
public class MyService {
private MyDependency myDependency;
public void performOperation() {
// 使用myDependency执行操作
}
public void injectDependency(MyDependency myDependency) {
this.myDependency = myDependency;
}
}
这些依赖注入方式可以根据实际需求选择使用。构造器注入是推荐的方式,因为它能够确保对象在创建时就具有完备的依赖关系,同时提高了对象的不可变性。Setter注入适用于可选或者可变的依赖关系,而接口注入和方法注入在某些情况下也可能是合适的选择。
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