相关疑难解决方法(0)

我一直在打破这个问题.不确定我错过了什么.我无法@Value在纯java配置的spring应用程序(非web)中使用注释

@Configuration
@PropertySource("classpath:app.properties")
public class Config {
    @Value("${my.prop}") 
    String name;

    @Autowired
    Environment env;

    @Bean(name = "myBean", initMethod = "print")
    public MyBean getMyBean(){
         MyBean myBean = new MyBean();
         myBean.setName(name);
         System.out.println(env.getProperty("my.prop"));
         return myBean;
    }
}

属性文件只包含my.prop=avaluebean如下:

public class MyBean {
    String name;
    public void print() {
        System.out.println("Name: " + name);
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

环境变量正确打印值,而@Value不是.
avalue
Name: ${my.prop}

主类只是初始化上下文.

AnnotationConfigApplicationContext ctx = …

我有一个Spring @Configuration类,它应该在环境中设置特定属性值时注册bean.我编写了一个自定义Condition实现,检查该值是否存在,并且当我在Spring Boot中启动应用程序时它可以工作,但是在运行JUnit测试时从未注册过bean.我调试了应用程序并确定在实例化Condition之前正在评估PropertySourcesPlaceholderConfigurer它.

我修改了我Condition的实现ConfigurationCondition并在REGISTER_BEAN阶段中指定了评估.在实例化configurer之前仍然调用该方法,但是当我从属性文件中添加或删除属性时,已注册的bean现在来去.

这是重新评估评估的最佳方式吗？这是ConfigurationCondition接口的用途,还是我现在不小心让它上班？

@Conditional(PropertyCondition.class)
@Configuration
public class PostbackUrlConfiguration {
    @Value("${serviceName.postbackUrl}")
    String postbackUrl;

    @Bean
    public PostbackUrlProvider provider() {
        return new FixedUrlProvider(postbackUrl);
    }
}

public class PropertyCondition implements ConfigurationCondition {
    @Override
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        return context.getEnvironment().containsProperty("serviceName.postbackUrl");
    }

    @Override
    public ConfigurationPhase getConfigurationPhase() {
        return ConfigurationPhase.REGISTER_BEAN;
    }
}

测试配置是我测试用例的静态类:

@Configuration
@ComponentScan
@PropertySource("classpath:/postback.properties")
@Import(PostbackUrlConfiguration.class)
public static class TestConfig {
    @Bean
    public static PropertySourcesPlaceholderConfigurer …

Spring 4有两个新的注释@Condition,@ConfigurationConditon用于控制是否将bean添加到spring应用程序上下文中.JavaDoc没有提供足够的上下文/大图来理解用例@ConfigurationCondition.

什么时候应该@ConfigurationCondition用@Condition？

public interface ConfigurationCondition extends Condition {

    /**
     * Returns the {@link ConfigurationPhase} in which the condition should be evaluated.
     */
    ConfigurationPhase getConfigurationPhase();

    /**
     * The various configuration phases where the condition could be evaluated.
     */
    public static enum ConfigurationPhase {

        /**
         * The {@link Condition} should be evaluated as a {@code @Configuration} class is
         * being parsed.
         *
         * <p>If the condition does not match at this …