Spring 初始化

pom.xml

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.1.10.RELEASE</version>
</dependency>

通过配置文件

编写实体类

public class User {
    public String name = "test";
}

配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="user" class="com.example.entity.User">
        <property name="name" value="test"/>
    </bean>
</beans>

测试

@Test
public void test(){
    ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
    User user = (User) applicationContext.getBean("user");
    System.out.println(user.name);
}

通过注解

配置文件

<?xml version="1.0" encoding="UTF-8"?>
<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.xsd
                           http://www.springframework.org/schema/context
                           http://www.springframework.org/schema/context/spring-context.xsd">
    <!--指定注解扫描包-->
    <context:component-scan base-package="com.test.entity"/>
</beans>

编写实体类

@Component("user")
public class User {
    public String name = "test";
}

测试

@Test
public void test(){
    ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
    User user = (User) applicationContext.getBean("user");
    System.out.println(user.name);
}