使用@Value值注入及配置文件组件扫描

<context:component-scan base-package="com"/>

<context:component-scan base-package="com.**.controller"/>

<context:property-placeholder location="classpath:{your variable file}.properties"/>

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:applicationContext.xml",
"classpath:servlet-dispatcher.xml"})
public class InjecTest {
    @Value("${ly.key}")
    private String key;
    @Test
    public void test(){
        System.out.println("注入的key为："+key);
    }

 //占位符方式
    @Value("${jdbc.url}")
    private String url;

 //SpEL表达方式，其中代表xml配置文件中的id值configProperties
    @Value("#{configProperties['jdbc.username']}")
    private String userName;

<!--基于占位符方式 配置单个properties -->
    <!--<context:property-placeholder location="conf/jdbc.properties"/>-->
    <!--基于占位符方式 配置多个properties -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:config/resource/dev/application.properties</value>
                <value>classpath:config/resource/dev/lyframework.properties</value>
                <value>classpath:config/resource/dev/common.properties</value>
            </list>
      </property>
    </bean>

 <!--基于SpEL表达式 配置多个properties id值为configProperties 提供java代码中使用 -->
    <bean id="configProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
        <property name="locations">
            <list>
                <value>classpath:/conf/jdbc.properties</value>
            </list>
        </property>
    </bean>
    <!--基于SpEL表达式 配置单个properties -->
    <!--<util:properties id="configProperties" location="classpath:conf/jdbc.properties"/>-->

SAY_COUNT=10
TITLE_COUNT=10
MESSAGE_COUNT=10
BACK_COUNT=10

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

@Value("${INDEX_TITLE}")
private Integer INDEX_TITLE;

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