Spring中初始化泛型类的方法实例

class Processor {}

Processor processor = new Processor<>(); //Java 7 及以上版本

@Named
class Processor {
}

Processor processor = new Processor(); //更准确来讲是 Processor processor = new Processor<>();

@Named
class Processor {
}

Processor processor = new Processor<>();

public interface Service {
 String process(T t);
}

@Named
public class NumberService implements Service {
 
 @Override
 public String process(R number) {
 return "Process Number: " + number; 
 }
}

NumberService numberService = new NumberService<>();

@Named
public class Processor {
 
 @Inject
 Private Service service;
}

Processor processor = new Processor<>();

@Named
public class StringService implements Service {
 @Override
 public String process(String string) {
 return "Process String: " + string;
 }
}

Processor processor = new Processor<>();
processor.service = new StringService();

Processor processor = new Processor<>();
processor.service = new NumberService();

2016-12-09 00:56:50.922 WARN 4950 --- [  main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'processor': Unsatisfied dependency expressed through field 'service'; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'cc.unmi.Service<&＃63;>' available: expected single matching bean but found 2: numberService,stringService
2016-12-09 00:56:50.941 ERROR 4950 --- [  main] o.s.b.d.LoggingFailureAnalysisReporter :

***************************
APPLICATION FAILED TO START
***************************

Description:

Field service in cc.unmi.Processor required a single bean, but 2 were found:
 - numberService: defined in file [/Users/Yanbin/Workspaces/github/spring-generic-demo/target/classes/cc/unmi/NumberService.class]
 - stringService: defined in file [/Users/Yanbin/Workspaces/github/spring-generic-demo/target/classes/cc/unmi/StringService.class]

Action:

Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed

@Named class Processor {
 @Inject Service service;
}

@Named class Processor {
 @Inject Service service;
}