Question

在Spring JavaConfig中，我可以定义属性源并注入到Environment

中

@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”）

检索属性文件中定义的属性

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

Answer 1

AFAIK，纯XML无法做到这一点。无论如何，这是我今天早上做的一些代码：

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;

    }

}

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>

props.properties文件：

hello=world

这很简单，只需使用ApplicationContextAware bean并从ConfigurableEnvironment获取(Web)ApplicationContext。然后只需向PropertiesPropertySource

添加MutablePropertySources即可

Answer 2

如果你需要的只是访问该物业＆＃34; xx＆＃34;在文件＆＃34; application.properties＆＃34;中，您可以通过在xml文件中声明以下bean来实现，而无需Java代码：

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="location" value="application.properties"/>
</bean>

然后，如果要在bean中注入属性，只需将其作为变量引用：

<bean id="myBean" class="foo.bar.MyClass">
        <property name="myProperty" value="${xx}"/>
</bean>

在xml中定义Spring @PropertySource并在Environment中使用它

2 个答案: