Spring注解开发教程——快速使用（2）

╰半橙微兮° 2023-07-13 03:49 61阅读 0赞

# 一、快速使用 #

本系列教程基于Spring注解进行，所有的设置均采用注解的方式。

# 二、步骤 #

## 1.引入maven依赖 ##

<dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>5.2.4.RELEASE</version>
            </dependency>
    
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
            </dependency>
    
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.12</version>
                <scope>provided</scope>
            </dependency>
        </dependencies>

说明：建议使用最新版本。

## 2.User实体类 ##

@Data
    public class User {
    
        private Integer id;
    
        private String userName;
    
        private String realName;
    
        private String sex;
    
        private String mobile;
    
        private String email;
    
        private String note;
    
        private Integer positionId;
    
    }

## 3.Spring配置类 ##

@Configuration
    public class SpringConfig {
    
        @Bean
        public User user() {
           return new User();
        }
    }

## 4.测试代码 ##

public class SpringTest {
    
        private ApplicationContext applicationContext;
    
        @Before
        public void init() {
            //通过配置类加载Spring容器
            ApplicationContext applicationContext = new AnnotationConfigApplicationContext(SpringConfig.class);
            this.applicationContext = applicationContext;
        }
    
        @Test
        public void testSpring() {
            User user = applicationContext.getBean(User.class);
            User user2 = applicationContext.getBean(User.class);
            System.out.println(user == user2);
    
        }
    }

说明：通过简单的加载配置类即可快速的构造Spring容器，开发效率大大提升。