Question

我正在使用Spring框架，我想从缓存中返回我的名字。 5秒钟后，我将更新缓存，并希望收到一个新名称。...很遗憾，这无法正常工作。...为什么？

@Component
public class Test {

    public String name = "peter";

    @Cacheable(value = "numCache")
    public String getName() {
        return name;
    }

    @Scheduled(fixedRate = 5000)
    @CachePut(value = "numCache")
    public String setName() {
        this.name = "piet";
        return name;
    }


}

@Component
public class AppRunner implements CommandLineRunner {

public void run(String... args) throws Exception {

    Test test = new Test();

    while(true) {
        Thread.sleep(1000);
        System.out.println(test.getName());
    }

}


}

@SpringBootApplication
@EnableCaching
@EnableScheduling
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

Answer 1

您正在使用Test自己创建new的实例，而不是自动装配。我会这样尝试：

@Component
public class Test {

    public String name = "peter";

    @Cacheable(value = "numCache")
    public String getName() {
        return name;
    }

    @Scheduled(fixedRate = 5000)
    @CachePut(value = "numCache")
    public String setName() {
        this.name = "piet";
        return name;
    }


}

@Component
public class AppRunner implements CommandLineRunner {

    @Autowired private Test test;

    public void run(String... args) throws Exception {

        while(true) {
            Thread.sleep(1000);
            System.out.println(test.getName());
        }
    }
}

为什么CachePut在此示例中不起作用？

1 个答案: