初识spring02 - HelloSpring

1.导入依赖
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.2.0.RELEASE</version>
</dependency>

2.实体类

package com.lobster.pojo;

public class Hello {
    private String str;

    public String getStr() {
        return str;
    }

    public void setStr(String str) {
        this.str = str;
    }

    @Override
    public String toString() {
        return "Hello{" +
                "str='" + str + '\'' +
                '}';
    }
}

3.bean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">

    <!--使用spring来创建对象，这些在spring中都称为bean-->

    <bean id="hello" class="com.lobster.pojo.Hello">

        <property name="str" value="HelloSpring"></property>
    </bean>
</beans>
4.测试
import com.lobster.pojo.Hello;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    public static void main(String[] args) {

        //获取spring的上下文对象
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        /*
            我们的对象现在都在spring的容器里面了，要用就直接去里面取出来就可以
            spring中所有的对象都叫做bean，现在我们要取出一个名字叫做hello的bean
            然后把它强转为Hello类型
         */


        Hello hello = (Hello) context.getBean("hello");

        System.out.println(hello.toString());


    }
}

![](https://img2020.cnblogs.com/blog/2096323/202008/2096323-20200827112608833-1658204150.png)