maven profile 结合spirng注解使用——实现配置文件最小化

た入场券 2022-06-15 04:21 155阅读 0赞

# 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>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${springframework.version}</version>
            </dependency>
            
            <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>
                
                <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：

![Center][]

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：

![Center 1][]

切换profile的激活模式，切换成test。

再次运行，查看结果：

![Center 2][]

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。

[Center]: /images/20220615/d67780067b1642588ebc93c054557b69.png
[Center 1]: /images/20220615/ca0fce662d5b4abc9c9c908ee1c1b4da.png
[Center 2]: /images/20220615/4398dde622a9473fa7a7bdc5697f8ee7.png