springmvc xml文件配置中使用系統環境變量

來源:how to read System environment variable in Spring applicationContext

答案：

In order to access system environment variable, that is OS level variables as amoe commented, we can simply use "systemEnvironment" instead of "systemProperties" in that EL. Like #{systemEnvironment['ENV_VARIABLE_NAME']}

 

使用SpringEL表達式來獲取

#{systemEnvironment['ENV_VARIABLE_NAME']}

例如:

<!--上傳文件-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="UTF-8"/>
        <property name="uploadTempDir" value="file://#{systemEnvironment['TEMP']}"/>
    </bean>

 

可能須要如下依賴

<dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.2.5.RELEASE</version>
    </dependency>   
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.2.5.RELEASE</version>
    </dependency>