在程序入口加入：
@SpringBootApplication
public class SpringbootFirstApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootFirstApplication.class, args);
}
@Bean
public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
return args -> {
System.out.println("Let‘s inspect the beans provided by Spring Boot:");
String[] beanNames = ctx.getBeanDefinitionNames();
Arrays.sort(beanNames);
for (String beanName : beanNames) {
System.out.println(beanName);
}
};
}
}
程序输出：
Let’s inspect the beans provided by Spring Boot: basicErrorController beanNameHandlerMapping beanNameViewResolver characterEncodingFilter commandLineRunner conventionErrorViewResolver defaultServletHandlerMapping defaultViewResolver dispatcherServlet dispatcherServletRegistration duplicateServerPropertiesDetector embeddedServletContainerCustomizerBeanPostProcessor error errorAttributes errorPageCustomizer errorPageRegistrarBeanPostProcessor …. ….
在程序启动的时候，springboot自动诸如注入了40-50个bean.
通过@RunWith() @SpringBootTest开启注解：
@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class HelloControllerIT {
@LocalServerPort
private int port;
private URL base;
@Autowired
private TestRestTemplate template;
@Before
public void setUp() throws Exception {
this.base = new URL("http://localhost:" + port + "/");
}
@Test
public void getHello() throws Exception {
ResponseEntity<String> response = template.getForEntity(base.toString(),
String.class);
assertThat(response.getBody(), equalTo("Greetings from Spring Boot!"));
}
}
运行它会先开启sprigboot工程，然后再测试，测试通过
