在xml中定义Spring @PropertySource并在Environment中使用它 [英] Define Spring @PropertySource in xml and use it in Environment

问题描述

在Spring JavaConfig中，我可以定义属性源并注入到环境中

In spring JavaConfig, I can define property source and inject into Environment

@PropertySource("classpath:application.properties")

@Inject private Environment environment;

如果在xml中我该怎么做？
我使用context：property-placeholder，并在JavaConfig类@ImportResource上导入xml。但我无法使用environment.getProperty（xx）

How do I do that if in xml? I am using context:property-placeholder, and on the JavaConfig class @ImportResource to import the xml. But I cannot retrieve property defined in the properties file using environment.getProperty("xx")

<context:property-placeholder location="classpath:application.properties" />

推荐答案

AFAIK，纯粹无法做到这一点XML。无论如何，这是我今天早上做的一些代码：

AFAIK, there is no way of doing this by pure XML. Anyways, here is a little code I did this morning:

首先，测试：

public class EnvironmentTests {

    @Test
    public void addPropertiesToEnvironmentTest() {

        ApplicationContext context = new ClassPathXmlApplicationContext(
                "testContext.xml");

        Environment environment = context.getEnvironment();

        String world = environment.getProperty("hello");

        assertNotNull(world);

        assertEquals("world", world);

        System.out.println("Hello " + world);

    }

}

然后上课：

public class PropertySourcesAdderBean implements InitializingBean,
        ApplicationContextAware {

    private Properties properties;

    private ApplicationContext applicationContext;

    public PropertySourcesAdderBean() {

    }

    public void afterPropertiesSet() throws Exception {

    PropertiesPropertySource propertySource = new PropertiesPropertySource(
            "helloWorldProps", this.properties);

    ConfigurableEnvironment environment = (ConfigurableEnvironment) this.applicationContext
            .getEnvironment();

    environment.getPropertySources().addFirst(propertySource);

    }

    public Properties getProperties() {
        return properties;
    }

    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {

        this.applicationContext = applicationContext;

    }

}

和testContext .xml：

And the testContext.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans ...>

    <util:properties id="props" location="classpath:props.properties" />

    <bean id="propertySources" class="org.mael.stackoverflow.testing.PropertySourcesAdderBean">
        <property name="properties" ref="props" />
    </bean>


</beans>

和props.properties文件：

And the props.properties file:

hello=world

这很简单，只需使用一个 ApplicationContextAware bean并从（Web）ApplicationContext ConfigurableEnvironment >。然后只需将 PropertiesPropertySource 添加到 MutablePropertySources

It is pretty simple, just use a ApplicationContextAware bean and get the ConfigurableEnvironment from the (Web)ApplicationContext. Then just add a PropertiesPropertySource to the MutablePropertySources

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