这篇文章主要介绍了通过实例了解Spring中@Profile的作用,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
根据系统环境的不同，Profile可以用来切换数据源。例如切换开发，测试，生产环境的数据源。
举个例子：
先创建配置类MainProfileConfig：
@Configuration
@PropertySource("classpath:/jdbc.properties")
public class MainProfileConfig implements EmbeddedValueResolverAware {
@Value("${db.user}")
private String user;
private String driverClass;
private StringValueResolver stringValueResolver;
@Profile("test")
@Bean("testDataSource")
public DataSource getTestDataSource(@Value("${db.password}") String pwd) throws PropertyVetoException {
ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();
comboPooledDataSource.setUser(user);
comboPooledDataSource.setPassword(pwd);
comboPooledDataSource.setDriverClass(driverClass);
return comboPooledDataSource;
}
@Profile("dev")
@Bean("devDataSource")
public DataSource getDevDataSource(@Value("${db.password}") String pwd) throws PropertyVetoException {
ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();
comboPooledDataSource.setUser(user);
comboPooledDataSource.setPassword(pwd);
comboPooledDataSource.setDriverClass(driverClass);
return comboPooledDataSource;
}
@Profile("pro")
@Bean("proDataSource")
public DataSource getproDataSource(@Value("${db.password}") String pwd) throws PropertyVetoException {
ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();
comboPooledDataSource.setUser(user);
comboPooledDataSource.setPassword(pwd);
comboPooledDataSource.setDriverClass(driverClass);
return comboPooledDataSource;
}
@Override
public void setEmbeddedValueResolver(StringValueResolver stringValueResolver) {
this.stringValueResolver = stringValueResolver;
driverClass = stringValueResolver.resolveStringValue("${db.driverClass}");
}
}
这里使用@Value和StringValueResolver来给属性赋值
测试：运行的时候设置环境 -Dspring.profiles.active=dev
public class ProFileTest {
@Test
public void test(){
AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainProfileConfig.class);
String[] beanNamesForType = applicationContext.getBeanNamesForType(DataSource.class);
for (String name : beanNamesForType){
System.out.println(name);
}
applicationContext.close();
}
}
打印输出：
devDataSource
也可以使用代码的方式设置系统环境，创建容器的时候使用无参构造方法，然后设置属性。
@Test
public void test(){
//创建容器
AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext();
//设置需要激活的环境
applicationContext.getEnvironment().setActiveProfiles("test");
//设置主配置类
applicationContext.register(MainProfileConfig.class);
//启动刷新容器
applicationContext.refresh();
String[] beanNamesForType = applicationContext.getBeanNamesForType(DataSource.class);
for (String name : beanNamesForType){
System.out.println(name);
}
applicationContext.close();
}
打印输出：
testDataSource
setActiveProfiles设置环境的时候可以传入多个值，它的方法可以接受多个参数。
public interface ConfigurableEnvironment extends Environment, ConfigurablePropertyResolver {
void setActiveProfiles(String... var1);
