Java env.getProperty 不工作 Spring PropertyPlaceholderConfigurer
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env.getProperty not working Spring PropertyPlaceholderConfigurer
提问by invariant
I am loading properties file using spring
我正在使用 spring 加载属性文件
<bean id="appProperties" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations" value="classpath:/sample.properties" />
<property name="ignoreUnresolvablePlaceholders" value="true"/>
</bean>
when i am getting property value using
当我使用
@Value("${testkey}")its working fine.
@Value("${testkey}")它的工作正常。
but when i am trying to get using env
但是当我尝试使用 env 时
@Resource
private Environment environment;
environment.getProperty("testkey") // returning null
采纳答案by Sotirios Delimanolis
A PropertyPlaceholderConfigurerdoes not add the properties from its locationsto the Environment. With Java config, you can use @PropertySourceto do that.
APropertyPlaceholderConfigurer不会将其属性添加locations到Environment. 使用 Java 配置，您可以使用它@PropertySource来做到这一点。
回答by invariant
If any one want to achieve this without using @PropertySource
如果有人想在不使用 @PropertySource 的情况下实现这一目标
use ApplicationContextInitializer interface and its companion, the contextInitializerClasses servlet context param.
使用 ApplicationContextInitializer 接口和它的伴侣，contextInitializerClasses servlet 上下文参数。
add this in web.xml
在 web.xml 中添加这个
<context-param>
<param-name>contextInitializerClasses</param-name>
<param-value>com.test.MyInitializer</param-value>
</context-param>
and define your Initializer
并定义您的初始化程序
public class MyInitializer implements ApplicationContextInitializer<ConfigurableWebApplicationContext> {
public void initialize(ConfigurableWebApplicationContext ctx) {
PropertySource ps = new ResourcePropertySource(new ClassPathResource("sample.properties")); // handle exception
ctx.getEnvironment().getPropertySources().addFirst(ps);
}
}
Reference : Spring 3.1 M1: Unified Property Management
