java配置文件优先级_spring 读取配置文件的优先级

spring 读取配置文件的优先级

1 结论

在spring加载properties配置文件的过程中，会根据key出现覆盖现象，后加载的覆盖前面的。

加载顺序

key

value

最终输出

p1

testConver

没有覆盖，为p1

覆盖，为p2属性

p1

test

测试区

测试区

p2

testConver

覆盖，为p2属性

覆盖，为p2属性

p2

test

开发区

开发区

2 上干活

2.1 java 代码

单元测试类为：

import org.junit.Test;

import org.junit.runner.RunWith;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration(value = "classpath:/spring-resources.xml")

public class SpringPropertiesTest {

@Value("${testConver}")

private String testConver;

@Value("${dev}")

private String dev;

@Value("${test}")

private String test;

@Test

public void showPropValue() {

System.out.println(testConver);

System.out.println(dev);

System.out.println(test);

}

}

2.2 spring配置

spring-resources.xml配置为

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd">

classpath:p1.properties

classpath:p2.properties

2.3 配置文件

p1.properties：

testConver=没有覆盖，为p1

test=测试区

p2.properties：

testConver=覆盖，为p2属性

dev=开发区

2.4 控制台输出结果

控制台输出内容为：

十月 28, 2016 3:24:18 下午 org.springframework.test.context.TestContextManager retrieveTestExecutionListeners

信息: @TestExecutionListeners is not present for class [class com.dxhy.spring.SpringPropertiesTest]: using defaults.

十月 28, 2016 3:24:18 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [spring-resources.xml]

十月 28, 2016 3:24:19 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.GenericApplicationContext@2723a510: startup date [Fri Oct 28 15:24:19 CST 2016]; root of context hierarchy

十月 28, 2016 3:24:19 下午 org.springframework.core.io.support.PropertiesLoaderSupport loadProperties

信息: Loading properties file from class path resource [p1.properties]

十月 28, 2016 3:24:19 下午 org.springframework.core.io.support.PropertiesLoaderSupport loadProperties

信息: Loading properties file from class path resource [p2.properties]

十月 28, 2016 3:24:19 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons

信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@690a614: defining beans [propertyConfigurer,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor#0]; root of factory hierarchy

覆盖，为p2属性

开发区

测试区

十月 28, 2016 3:24:19 下午 org.springframework.context.support.AbstractApplicationContext doClose

信息: Closing org.springframework.context.support.GenericApplicationContext@2723a510: startup date [Fri Oct 28 15:24:19 CST 2016]; root of context hierarchy