如何在码头上转换普通java主程序

Question

• 我想使用Jenkins将旧的java代码迁移/运行到docker。

1. It is structured to run using normal main method of java (Jar file having main method is executed through some script). 
2. Its making use of spring.xml(applicationContext.xml) files with spring-context-2.5.xsd 
3. Uses properties file for all configurations. 

​

• 我现正就以下事项寻求建议：

1. Does this project needs to be migrated to spring-boot application for migrating to/creating docker image?
2. If yes, please have a look at current code block
3. Do I need to replace properties files by yml files?

​

• 当前的主类代码可以被定义为：

public class SIIRunner {   

    public static void main(String[] args){   

        String envStr = null;
        if (args != null && args.length > 0) {
            envStr = args[0];
        }

        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        SIIExecutor siiExecutor= (SIIExecutor) ctx.getBean("SIIExecutor");
        siiExecutor.pollAndOperate();
    }
}

Answer 1

@SpringBootApplication
public class Application {
    public static void main(String[] args) throws Exception {
        ApplicationContext app = SpringApplication.run(Application.class, 
         args);//init the context
        SIIExecutor siiExecutor = (SIIExecutor) 
         app.getBean(SIIExecutor.class);//get the bean by type
    }
    @Bean // this method is the equivalent of the <bean/> tag in xml
    public SIIExecutor getBean(){
         return new SIIExecutor();
    }
}

只要您开始使用@Configuration基类(听起来可能像使用@SpringBootApplication )，就可以使用@ImportResource注释来包含XML文件。

@SpringBootApplication
@ImportResource("classpath:beanFileName.xml")
public class SpringConfiguration {
  //
}

Spring引导的理想概念是避免xml文件。但是，如果您想保留xml，只需添加@ImportResource("classPath:beanFileName.xml")即可。

我建议删除beanFileName.xml文件。并将此文件转换为基于spring注释的bean。因此，任何类都是作为bean创建的。只需在类名之前编写@Service或@Component注释即可。例如：

基于XML的：

<bean ID="id name" class="com.example.MyBean">

基于注释的：

@Service or @Component
class MyBean {
}

再加上@ComponentScan("Give the package name")。

这是最好的办法。希望这能有所帮助。