maven profile 结合spirng注解使用——实现配置文件最小化

上一篇文章说的是如何使用maven的profile实现不同环境读取不同的配置（http://blog.csdn.net/wild46cat/article/details/72630678）。

本篇文章就来介绍如何在使用了maven的profile之后，再使用spring来实现对配置文件进行方便的访问。

好，下面上货。

首先新建一个maven项目：

mvn archetype:generate -DarchetypeCatalog=internal

然后修改pom文件

<properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <springframework.version>4.3.7.RELEASE</springframework.version>    </properties>    <dependencies>        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>4.12</version>            <scope>test</scope>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context</artifactId>            <version>${springframework.version}</version>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-test</artifactId>            <version>${springframework.version}</version>        </dependency>    </dependencies>    <profiles>        <profile>            <id>dev</id>            <properties>                <db.driver>com.mysql.jdbc.Driver</db.driver>            </properties>            <activation>                <activeByDefault>true</activeByDefault>            </activation>        </profile>        <profile>            <id>test</id>            <properties>                <db.driver>com.oracle.jdbc.Driver</db.driver>            </properties>        </profile>    </profiles>    <build>        <resources>            <!--配置文件路径-->            <resource>                <directory>src/main/resource</directory>                <filtering>true</filtering>            </resource>        </resources>        <plugins>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>                <configuration>                    <source>1.8</source>                    <target>1.8</target>                    <encoding>utf-8</encoding>                </configuration>            </plugin>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-shade-plugin</artifactId>                <version>3.0.0</version>                <executions>                    <execution>                        <phase>package</phase>                        <goals>                            <goal>shade</goal>                        </goals>                        <configuration>                            <transformers>                                <transformer                                        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">                                    <mainClass>com.xueyou.demo.App</mainClass>                                </transformer>                            </transformers>                        </configuration>                    </execution>                </executions>            </plugin>        </plugins>    </build>

看一下当前目录结构的格式：

App.java

package com.xueyou.demo;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.PropertySource;/** * Hello world! */@Configuration@ComponentScan(basePackages = {"com.xueyou.demo"})@PropertySource(value = {"classpath:appConfig.properties"})public class App {    public static void main(String[] args) {        System.out.println("Hello World!");        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(com.xueyou.demo.App.class);        AppConfig appConfig = applicationContext.getBean(AppConfig.class);        System.out.println(appConfig.getAppName());        System.out.println(appConfig.getDriverName());    }}

AppConfig.java

package com.xueyou.demo;import org.springframework.beans.factory.annotation.Value;import org.springframework.beans.factory.config.ConfigurableBeanFactory;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Component;@Component@Scope(ConfigurableBeanFactory.SCOPE_SINGLETON)public final class AppConfig {    @Value("${app.name}")    private String appName;    @Value("${app.driver}")    private String driverName;    public String getAppName() {        return appName;    }    public String getDriverName() {        return driverName;    }}

AppConfig.properties

app.driver=${db.driver}app.encoding=${project.build.sourceEncoding}app.name=APPNAME

首先我们需要选择的是profile的激活状态，是dev激活

运行后结果：

切换profile的激活模式，切换成test。

再次运行，查看结果：

总结：

能够从运行结果中看出，当改变profile的激活模式的时候，能够在程序中对配置文件中的值进行动态构建。