我理解Spring DI以及它的工作原理.
但是我在这里无法理解的是@Bean方法参数注入的情况,spring如何知道参数名称,以便它可以根据参数的名称从bean的工厂注入bean？
例如,在以下示例中,方法fernas1和fernas2参数在运行时被擦除.但是,spring仍然可以将正确的Abbas bean实例注入其中.
@SpringBootApplication
public class DemoApplication {
@Autowired
private Abbas abbas1; // this is understandable,hence the field name is available at runtime
@Autowired
private Abbas abbas2; // this is understandable,hence the field name is available at runtime
public static void main(String[] args) {
ConfigurableApplicationContext ctx = SpringApplication.run(DemoApplication.class,args);
Map最佳答案
如果参数名称反射不可用,它将使用类文件本身中的信息.见DefaultParameterNameDiscoverer
Default implementation of the ParameterNameDiscoverer strategy
interface,using the Java 8 standard reflection mechanism (if
available),and falling back to the ASM-based
LocalVariableTableParameterNameDiscoverer for checking debug
information in the class file.
例如,DemoApplication.fernas2的LocalVariableTable是
Start Length Slot Name Signature
0 16 0 this Lcom/example/demo/DemoApplication;
0 16 1 abbas2 Lcom/example/demo/DemoApplication$Abbas;
9 7 2 fernas2 Lcom/example/demo/DemoApplication$Fernas;
