Spring基于@Conditional条件化装配bean

/**
 * @Author lsc
 * <p> </p>
 */
public class User {

  private String userName;

	// 省略 set get
}

public class RuntimeExist implements Condition {
  public boolean matches(ConditionContext conditionContext, AnnotatedTypeMetadata annotatedTypeMetadata) {
    // 获取jvm 运行时环境
    Environment environment = conditionContext.getEnvironment();
    // 检查 jvm 运行时环境是否存在属性
    return environment.containsProperty("java.runtime.name");
  }
}

/**
 * @Author lsc
 * <p> </p>
 */
@Configuration
public class UserConfig {

  @Bean
  // 根据 RuntimeExist的 matches 方法的返回值 是否装配bean
  @Conditional(RuntimeExist.class)
  public User user(){
    User user = new User();
    user.setUserName("zszxz");
    return user;
  }
}

@RunWith(SpringJUnit4ClassRunner.class)//创建spring应用上下文
@ContextConfiguration(classes= UserConfig.class)//加载配置类
public class ConditionTest {

  @Autowired
  User user;

  @Test
  public void test(){
    // zszxz
    System.out.println(user.getUserName());
  }
}