本篇文章给大家分享的是有关@profile注解如何在spring中使用,小编觉得挺实用的,因此分享给大家学习,希望大家阅读完这篇文章后可以有所收获,话不多说,跟着小编一起来看看吧。
首先是新建maven工程
mvn archetype:generate -DarchetypeCatalog=internal
下面是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> <build> <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> <artifactId>maven-assembly-plugin</artifactId> <version>3.0.0</version> <configuration> <archive> <manifest> <mainClass>com.xueyou.demo</mainClass> </manifest> </archive> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs> </configuration> <executions> <execution> <id>make-assembly</id> <!-- this is used for inheritance merges --> <phase>package</phase> <!-- bind to the packaging phase --> <goals> <goal>single</goal> </goals> </execution> </executions> </plugin> </plugins> </build>
整体看一下工程中的类和接口:
首先是Person类中有一个speak的方法,这个方法是MoveFactor这个借口提供的。Chinese、English和German都实现了这个接口。但是这三个类的@profile中的值是不同的。通过SpringTest中分配不同的activeprofile就能够实现调用不同的speak方法。
下面看代码:
MoveFactor.interface
package com.xueyou.demo; public interface MoveFactor { void speak(); }
Person.java
package com.xueyou.demo; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; @Component public class Person { @Autowired private MoveFactor moveFactor; public void speak(){ moveFactor.speak(); } }
Chinese.java
package com.xueyou.demo; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Profile; import org.springframework.stereotype.Component; @Configuration @Profile(value = "dev") @Component public class Chinese implements MoveFactor { @Override public void speak() { System.out.println("我是中国人"); } }
English.java
package com.xueyou.demo; import org.springframework.context.annotation.Profile; import org.springframework.stereotype.Component; @Component @Profile("qa") public class English implements MoveFactor{ @Override public void speak() { System.out.println("i am an English"); } }
German.java
package com.xueyou.demo; import org.springframework.context.annotation.Profile; import org.springframework.stereotype.Component; @Component @Profile("prod") public class German implements MoveFactor{ @Override public void speak() { System.out.println("i am a German"); } }
使用springtest进行测试
package com.xueyou.demo; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ActiveProfiles; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(classes = App.class) @ActiveProfiles("dev") public class SpringTest { @Autowired Person p; @Test public void testProfile(){ p.speak(); } }
运行结果:
当修改@ActiveProfile中的值时,输出的内容也会随之改变。
如果使用的是main函数进行真正的开发、测试和上线时,我们需要设置一下运行参数:
-D 后面加上需要设置的spring的属性,就能够在main函数中使用了。
App.java
package com.xueyou.demo; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; @Configuration @ComponentScan(basePackages = {"com.xueyou.demo"}) public class App { public static void main(String[] args) { ConfigurableApplicationContext context = new AnnotationConfigApplicationContext(com.xueyou.demo.App.class); Person p = context.getBean(Person.class); p.speak(); } }
运行结果:
如果需要得到当前的activeprofile可以通过ConfigurableApplicationContext的实例来的到。
最后提一下,如果是在web的后台项目中如何进行设置。这个时候我们通过xml的方式进行设置:
<context-param> <param-name>spring.profiles.active</param-name> <param-value>DOUBLEUPMINT</param-value> </context-param>
以上就是@profile注解如何在spring中使用,小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注编程网行业资讯频道。