spring获取配制文件的参数

项目中需要获取一些万年不变的参数,比如单点登录的域名

怎么从多个文件配置中获取呢,原来spring早已经提供了类PropertyPlaceholderConfigurer

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:jdbc="http://www.springframework.org/schema/jdbc"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:util="http://www.springframework.org/schema/util"
       xmlns:mongo="http://www.springframework.org/schema/data/mongo"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
       http://www.springframework.org/schema/data/mongo
       http://www.springframework.org/schema/data/mongo/spring-mongo-1.2.xsd
          http://www.springframework.org/schema/jdbc
        http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
        http://www.springframework.org/schema/jee
        http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/util
        http://www.springframework.org/schema/util/spring-util-3.2.xsd">
    <!-- 开启IOC注解扫描 -->
    <context:component-scan base-package="org.great" />

    <!-- 开启MVC注解扫描 -->
    <mvc:annotation-driven />

    <bean id="systemProperties" class="org.great.Untiltools.SystemProperties">
        <property name="locations">
            <list>
                <value>classpath:/PropertiesTest/core.properties</value>
            </list>
        </property>
        <property name="fileEncoding" value="utf-8"/>
    </bean>

</beans>

@Data
public class SystemProperties extends PropertyPlaceholderConfigurer {//继承这个类即可

    private Properties mergedProp = new Properties();
    @Override
    protected Properties mergeProperties() throws IOException {//一定要重写,否则默认使用默认的
        mergedProp = super.mergeProperties();
        return mergedProp;
    }

    public String getContextValue(String key) {
        Assert.notNull(key, "key值无效");
        if(mergedProp.containsKey(key)){
           return  (String) mergedProp.get(key);
        }else {
            throw new RuntimeException("key值不存在");
        }
    }

测试一下

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:/springPropertise.xml")
public class SystemPropertiesTest {

    @Resource(name="systemProperties")
    SystemProperties systemProperties;
    @Test
    public void test(){
       String ss= systemProperties.getContextValue("database.maxWait");
        int c=0;

    }

参考博客:http://blog.csdn.net/irokay/article/details/73010676