通过Java代码显示装配Bean的源码案例

目录

pom.xml

<?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>

SpringConfig.java配置类

@Configuration
public class SpringConfig {

    @Bean(name = "userServiceImpl")
    public UserService setUserService(){
        return new UserServiceImpl();
    }

    @Bean(name = "userRoleServiceImpl")
    public UserRoleService setUserRoleService(){
        return new UserRoleServiceImpl();
    }

//    @Bean(name = "userInfo")
//    public UserInfo setUserInfo(){
//        UserInfo userInfo = new UserInfo(setUserService(),setUserRoleService());
//        return  userInfo;
//    }


//    @Bean(name = "userInfo")
//    public UserInfo setUserInfo(){
//        UserInfo userInfo = new UserInfo();
//        userInfo.setUserService(setUserService());
//        userInfo.setUserRoleService(setUserRoleService());
//        return userInfo;
//    }



    @Bean(name = "userInfo")
    public UserInfo setUserInfo(UserService userService,UserRoleService userRoleService){
        UserInfo userInfo = new UserInfo();
        userInfo.setUserService(userService);
        userInfo.setUserRoleService(userRoleService);
        return userInfo;
    }

}

UserInfo.java类

public class UserInfo {

    private UserService userService;

    private UserRoleService userRoleService;

    public UserInfo(){

    }

    public UserInfo(UserService userService, UserRoleService userRoleService){
        this.userService = userService;
        this.userRoleService = userRoleService;
    }

    public UserService getUserService() {
        return userService;
    }

    public void setUserService(UserService userService) {
        this.userService = userService;
    }

    public UserRoleService getUserRoleService() {
        return userRoleService;
    }

    public void setUserRoleService(UserRoleService userRoleService) {
        this.userRoleService = userRoleService;
    }

    public void getUserInfo(){
        System.out.println("UserInfo getUserInfo begin");
        System.out.println(userService.getUserInfo());
        System.out.println(userRoleService.getUserRoleInfo());
        System.out.println("UserInfo getUserInfo end");
    }

}

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;
    	.....
}

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes= SpringConfig.class)
public class userTest {

    @Autowired
    @Qualifier("userInfo")
    private UserInfo userInfo;


    @Test
    public void getInfo(){
        userInfo.getUserInfo();
    }
}

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