春季启动测试用例不使用自定义转换服务

我想用Spring Boot Test写出一个集成测试用例。春季启动测试用例不使用自定义转换服务

我定制ConversionService了解新java.time类型：

@Configuration 
public class ConversionServiceConfiguration { 
    @Bean 
    public static ConversionService conversionService() { 
     final FormattingConversionService reg = new DefaultFormattingConversionService(); 
     new DateTimeFormatterRegistrar().registerFormatters(reg); 
     return reg; 
    } 
}

再后来期望它的工作：

@Component 
class MyServiceConfig { 
    @Value("${max-watch-time:PT20s}") 
    private Duration maxWatchTime = Duration.ofSeconds(20); 
}

当在正常SpringApplication.run这似乎正常工作运行。然而，在我的测试案例：

@RunWith(SpringRunner.class) 
@SpringBootTest(webEnvironment=WebEnvironment.RANDOM_PORT, classes= { 
    MyServiceMain.class, 
    AttachClientRule.class 
}) 
public class MyTest { 
    @Inject 
    @Rule 
    public AttachClientRule client; 

    @Test(expected=IllegalArgumentException.class) 
    public void testBad() throws Exception { 
     client.doSomethingIllegal(); 
    } 
}

它吹起来：

产生的原因：org.springframework.beans.factory.UnsatisfiedDependencyException：错误创建名为 'AttachClientRule' 豆：不满意依赖通过表达构造函数参数0：

创建名为'MyServiceConfig'的Bean的错误：通过字段'maxWatchTime'表示的不满意的依赖项：无法将类型[java.lang.String]的值转换为所需的类型[java.time.Duration];

嵌套异常是java.lang.IllegalStateException：无法将[java.lang.String]类型的值转换为所需类型[java.time.Duration]：找不到匹配的编辑器或转换策略;

深窥视到执行实际转换TypeConverterDelegate的胆量，似乎捕捉到从外地用在DefaultListableBeanFactory的ConversionService。设置在哪里该字段设置一个观察点，我觉得AbstractApplicationContext.refresh()方法：

// Allows post-processing of the bean factory in context subclasses. 
postProcessBeanFactory(beanFactory); 
// Invoke factory processors registered as beans in the context. 
invokeBeanFactoryPostProcessors(beanFactory); 
// Register bean processors that intercept bean creation. 
registerBeanPostProcessors(beanFactory); 
// Initialize message source for this context. 
initMessageSource(); 
// Initialize event multicaster for this context. 
initApplicationEventMulticaster(); 
// Initialize other special beans in specific context subclasses. 
onRefresh(); // <--- MyServiceConfig initialized here 
// Check for listener beans and register them. 
registerListeners(); 
// Instantiate all remaining (non-lazy-init) singletons. 
finishBeanFactoryInitialization(beanFactory); // <--- DefaultListableBeanFactory.conversionService set here!!! 
// Last step: publish corresponding event. 
finishRefresh();

所以前ConversionService应用到BeanFactory的@Value注入正在发生的事情。没有bueno！

我发现似乎是一种解决方法：

@Configuration 
public class ConversionServiceConfiguration implements BeanFactoryPostProcessor { 
    @Bean 
    public static ConversionService conversionService() { 
     final FormattingConversionService reg = new DefaultFormattingConversionService(); 
     new DateTimeFormatterRegistrar().registerFormatters(reg); 
     return reg; 
    } 

    @Override 
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { 
     beanFactory.setConversionService(conversionService()); 
    } 
}

这迫使初始化早些时候发生，但并不觉得自己是正确的解决方案（至少它没有记载这样）。

我哪里出错了？春天4.3.0，春天引导1.4.0M3

编辑

而现在我发现另一种方式为它失败！未做相同的配置类实现EnvironmentAware：

@Override 
public void setEnvironment(Environment environment) { 
    ((AbstractEnvironment) environment).setConversionService(conversionService()); 
}

我发现PropertySourcesPropertyResolver使用错误的（默认）ConversionService。这让我很生气！

引起：java.lang.IllegalArgumentException异常：在org.springframework.core.env无法转换值[PT15s]从源类型[字符串]为目标类型[时间] 。PropertySourcesPropertyResolver.getProperty（PropertySourcesPropertyResolver.java:94）在org.springframework.core.env.PropertySourcesPropertyResolver.getProperty（PropertySourcesPropertyResolver.java:65）在org.springframework.core.env.AbstractPropertyResolver.getProperty（AbstractPropertyResolver.java:143）在org.springframework.core.env.AbstractEnvironment.getProperty（AbstractEnvironment.java:546）在com.mycorp.DoSomething.go（DoSomething.java:103）

来源

2016-06-21 Steven Schlansker