Autowired实现策略模式

1. 创建Springboot项目

2. 创建策略接口类

public interface TwoHandler {
    
    boolean accept(String type);

    
    void handler();
}

3. 创建具体策略类

@Service
public class Handler1 implements TwoHandler{
    @Override
    public boolean accept(String type) {
        return "handler1".equals(type);
    }

    @Override
    public void handler() {
        System.out.println("Handler1处理完成");
    }
}

@Service
public class Handler2 implements TwoHandler{
    @Override
    public boolean accept(String type) {
        return "handler2".equals(type);
    }

    @Override
    public void handler() {
        System.out.println("Handler2处理完成");
    }
}

4. 创建策略使用门面

@Component
public class TwoContext {
    @Autowired
    private List handlerList;

    public void handle(String type){
        TwoHandler handler = Optional.ofNullable(handlerList).orElseGet(null)
                .stream().filter(h -> h.accept(type))
                .findFirst().orElse(null);
        if(handler == null){
            throw new RuntimeException("can not find handler");
        }
        handler.handler();
    }
}

5. 使用

@SpringBootTest
class ApplicationTests {

    @Autowired
    private TwoContext twoContext;
    @Test
    void contextLoads() {
        twoContext.handle("handler1");
    }
}

输出

Handler1处理完成