问题描述
如果我正在开发一个相当简单的基于Spring Boot控制台的应用程序，我不确定主执行代码的位置。我应该将它放在 public static void main（String [] args） 方法中，还是让主应用程序类实现 CommandLineRunner 接口并将代码放在 run（String ... args） 方法？
If I am developing a rather simple Spring Boot console-based application, I am unsure about the placement of the main execution code. Should I place it in the public static void main(String[] args) method, or have the main application class implement the CommandLineRunner interface and place the code in the run(String... args) method?
我将使用一个例子作为上下文。假设我有以下[基本]应用程序（编码为接口，Spring样式）：
I will use a example as the context. Say I have the following [rudimentary] application (coded to interfaces, Spring style):
Application.java
public class Application {
@Autowired
private GreeterService greeterService;
public static void main(String[] args) {
// ******
// *** Where do I place the following line of code
// *** in a Spring Boot version of this application?
// ******
System.out.println(greeterService.greet(args));
}
}
GreeterService.java （接口）
GreeterService.java (interface)
public interface GreeterService {
String greet(String[] tokens);
}
GreeterServiceImpl.java （实现类）
GreeterServiceImpl.java (implementation class)
@Service
public class GreeterServiceImpl implements GreeterService {
public String greet(String[] tokens) {
String defaultMessage = "hello world";
if (args == null || args.length == 0) {
return defaultMessage;
}
StringBuilder message = new StringBuilder();
for (String token : tokens) {
if (token == null) continue;
message.append(token).append('-');
}
return message.length() > 0 ? message.toString() : defaultMessage;
}
}
<$的等效Spring Boot版本c $ c> Application.java 就是这样的：
GreeterServiceImpl.java （实现类）
The equivalent Spring Boot version of Application.java would be something along the lines:GreeterServiceImpl.java (implementation class)
@EnableAutoConfiguration
public class Application
// *** Should I bother to implement this interface for this simple app?
implements CommandLineRunner {
@Autowired
private GreeterService greeterService;
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
System.out.println(greeterService.greet(args)); // here?
}
// Only if I implement the CommandLineRunner interface...
public void run(String... args) throws Exception {
System.out.println(greeterService.greet(args)); // or here?
}
}
推荐答案
你应该有一个标准加载器：
You should have a standard loader:
@SpringBootApplication
public class MyDemoApplication {
public static void main(String[] args) {
SpringApplication.run(MyDemoApplication.class, args);
}
}
并实现 CommandLineRunner 接口与 @Component 注释
@Component
public class MyRunner implements CommandLineRunner {
@Override
public void run(String... args) throws Exception {
}
}
@EnableAutoConfiguration 将执行通常的SpringBoot魔术。
@EnableAutoConfiguration will do the usual SpringBoot magic.
更新：
正如@jeton所建议的那样，Springboot实现了直线：
As @jeton suggests the laters Springboot implements a straight:
spring.main.web-environment=false
spring.main.banner-mode=off
参见
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