@Conditional({Condition}) ： 按照一定的条件进行判断，满足条件给容器中注册bean
- 配置类
@Configuration
@ComponentScan(value = "com.tommy", useDefaultFilters = false)
public class MainConfigConditional {
@Bean(value = "linux")
@Conditional(LinuxConditional.class)
public Person person01() {
System.out.println("linux person 初始化....");
return new Person("jm", 36, "服务器端开发");
}
@Bean(value = "window")
@Conditional(WindowsCoditional.class)
public Person person02() {
System.out.println("window person 初始化....");
return new Person("jb", 16, "前端开发");
}
}
- 条件类 LinuxConditional.java
public class LinuxConditional implements Condition {
@Override
public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
final Environment environment = context.getEnvironment();
final String property = environment.getProperty("os.name");
//WindowsCoditional.java中，只需要判断 Windows
if (property.contains("linux")) {
return true;
}
return false;
}
}
测试类
public class IOCTestConditional {
@Test
public void testImport() {
ApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfigConditional.class);
System.out.println("IOC容器创建完成...");
final Person bean = applicationContext.getBean(Person.class);
System.out.println("bean "+bean);
}
}
运行结果
window person 初始化....
IOC容器创建完成...
bean Person(name=jb, age=16, nickName=前端开发)
Process finished with exit code 0
如果需要修改当前的操作系统：
VM options
-Dos.name=linux
