spring隐式的bean发现机制和自动化装配源码案例

r囧r小猫 2023-02-17 11:13 57阅读 0赞

# spring隐式的bean发现机制和自动化装配源码案例 #

## 目录结构 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N1bW1lcl9zdHlsZQ_size_16_color_FFFFFF_t_70]

## pom.xml依赖 ##

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>org.suda</groupId>
        <artifactId>springStudy02</artifactId>
        <version>1.0-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
            <spring.version>5.2.5.RELEASE</spring.version>
        </properties>
    
        <dependencies>
    
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>5.2.5.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>5.2.5.RELEASE</version>
            </dependency>
    
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
                <scope>test</scope>
            </dependency>
    
        </dependencies>
    </project>

## JavaConfig配置类 ##

@Configuration
    @ComponentScan(basePackages = { "com.userObject","com.userRoleObject"})
    public class SpringConfig { 
    
    }

## UserService.java接口 ##

public interface UserService { 
        UserVO getUserInfo();
    }

## UserServiceImpl.java实现类 ##

@Component
    @Qualifier("userServiceImpl")
    public class UserServiceImpl implements UserService { 
    
        public UserVO getUserInfo() { 
            UserVO userVO = new UserVO();
            userVO.setUserNum("zhangsan");
            userVO.setAge("23");
            userVO.setUserNum("123456");
            userVO.setSex("1");
            return userVO;
        }
    
    }

## UserRoleService.java接口 ##

public interface UserRoleService { 
        UserRoleVO getUserRoleInfo();
    }

## userRoleServiceImpl.java实现类 ##

@Component
    @Qualifier("userRoleServiceImpl")
    public class UserRoleServiceImpl implements UserRoleService { 
    
        public UserRoleVO getUserRoleInfo() { 
            UserRoleVO userRoleVO = new UserRoleVO();
            userRoleVO.setUserNum("2345");
            userRoleVO.setUserRoleName("客户经理");
            userRoleVO.setUserRoleNum("123456");
            return userRoleVO;
        }
    }

## UserRoleVO.java实体类 ##

public class UserRoleVO { 
    
        private String userRoleName;
        private String userRoleNum;
        private String userNum;
    	
    	.....
    }

## UserVO.java实体类 ##

public class UserVO { 
        private String userName;
        private String age;
        private String sex;
        private String userNum;
        	.....
    }

## userTest.java测试类 ##

@RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(classes= SpringConfig.class)
    public class userTest { 
        @Autowired
        @Qualifier("userServiceImpl")
        private UserService userService;
    
        @Autowired
        @Qualifier("userRoleServiceImpl")
        private UserRoleService userRoleService;
    
        @Test
        public void getInfo(){ 
            UserVO userVO = userService.getUserInfo();
            UserRoleVO userRoleVO = userRoleService.getUserRoleInfo();
            System.out.println(userVO);
            System.out.println(userRoleVO);
        }
    }

使用Spring的SpringJUnit4ClassRunner，以便在测试开始的时候自动创建Spring的应用上下文。注解@ContextConfiguration会告诉它需要在SpringConfig类中加载配置。应为SpringConfig类中包含了@ComponentScan。因此最终的应用上下文中应该包含userServiceImpl，userRoleServiceImpl两个Bean。

## 运行结果 ##

![在这里插入图片描述][20200613164041267.png]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N1bW1lcl9zdHlsZQ_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200613163508949.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N1bW1lcl9zdHlsZQ==,size_16,color_FFFFFF,t_70
[20200613164041267.png]: https://img-blog.csdnimg.cn/20200613164041267.png