Spring第一个程序

1、利用Maven导入jar包

<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-webmvc</artifactId>
	<version>5.3.10</version>
</dependency>
<dependency>
	<groupId>junit</groupId>
	<artifactId>junit</artifactId>
	<version>4.12</version>
	<scope>test</scope>
</dependency>

2、编写一个实体类

public class Hello {
    private String name;
 
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
 
    public void show(){
        System.out.println("Hello,"+ name );
    }
}

注意:setter一定不可省略,bean的property字段设置依赖于setter。

3、编写Spring文件 \(beans.xml\)

<?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就是java对象 , 由Spring创建和管理-->
    <bean id="hello" class="com.workhah.pojo.Hello">
        <property name="name" value="Spring"/>
    </bean>
</beans>

4、测试

@Test
public void test(){
    //解析beans.xml文件 , 生成管理相应的Bean对象
    ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
    //getBean : 参数即为spring配置文件中bean的id .
    Hello hello = (Hello) context.getBean("hello");
    hello.show();
}
posted @ 2021-11-08 01:05  WorkHaH  阅读(34)  评论(0编辑  收藏  举报