java - 如何使用 xml 配置将服务 bean 传递到 spring boot Controller

Question

我对注释不太满意。在我的 Spring Boot 应用程序中，我通过应用程序上下文在 Controller 中检索服务 bean。(我跳过了命名约定)

Say s1 = (Say) applicationContext.getBean("s1");

看来我的应用程序与spring紧密耦合，它正在制作样板代码。那么有没有办法通过xml配置将服务bean Autowiring 到 Controller 中呢？

我尝试过以下方法。但我收到类似“org.springframework.beans.factory.NoSuchBeanDefinitionException”的错误。下面我给出了代码:

Controller :

@RestController
public class Controller_Test implements SpringApplicationContextInterface
    {
         @Autowired
         private Say s1;

        @RequestMapping(value = "/test10")
        public String Test1()
        {
            s1.test();
            return "@RequestMapping(value = test10)";
        }


    }

public interface SpringApplicationContextInterface 
{
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beanConfig.xml");

}

XML 配置文件:

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-2.5.xsd">

        <!--<context:annotation-config />-->

    <bean class="com.fossians.maven_courses.Say"  />
</beans>

我也尝试过:

<bean class="com.fossians.maven_courses.Say" id="s1" />

错误:

***************************
APPLICATION FAILED TO START
***************************

Description:

Field s1 in com.fossians.maven_courses.Controller_Test required a bean of type 'com.fossians.maven_courses.Say' that could not be found.


Action:

Consider defining a bean of type 'com.fossians.maven_courses.Say' in your configuration.
...........................


Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'controller_Test': Unsatisfied dependency expressed through field 's1'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.fossians.maven_courses.Say' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
................................................


Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.fossians.maven_courses.Say' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
..............................

Answer 1

一种可能的解决方案是:

1. 首先验证 xml bean 文件是否位于资源文件夹中。
2. 验证 bean 定义是否已定义 id

<bean class="com.fossians.maven_courses.Say" id="s1">

到达主应用程序类，在 SpringBoot 注释之后添加 bean xml 文件的导入，在本例中我使用了 spring-config.xml

@SpringBootApplication
@ImportResource("classpath:spring-config.xml")

转到 Controller 类并自动连接应用程序上下文

@Autowired
private ApplicationContext context;

如果您需要通过应用程序上下文获取 s1 bean，请使用:

((Say)context.getBean("s1")).yourMethod();

您还可以在 Controller 上 Autowiring s1 服务

@Autowired
private Say sayBean;

您还可以在 Say 类中使​​用 @Service 注释并自动连接到 Controller ，这取决于您的需求。

希望有帮助。