spring_reference/II. Getting started/11.3. Writing the code.md

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### 11.3. 编写代码
为了完成应用程序我们需要创建一个单独的Java文件。Maven默认会编译`src/main/java`下的源码,所以你需要创建那样的文件结构,然后添加一个名为`src/main/java/Example.java`的文件:
```java
import org.springframework.boot.*;
import org.springframework.boot.autoconfigure.*;
import org.springframework.stereotype.*;
import org.springframework.web.bind.annotation.*;
@RestController
@EnableAutoConfiguration
public class Example {
@RequestMapping("/")
String home() {
return "Hello World!";
}
public static void main(String[] args) throws Exception {
SpringApplication.run(Example.class, args);
}
}
```
尽管这里没有太多代码,但很多事情正在发生。让我们分步探讨重要的部分。