springIoc Resource类

先添加jar包

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>
        <!--spring-core-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
        </dependency>
        <!--spring-bean-->
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
        </dependency>
        <!--spring-context-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
        </dependency>
        <!--spring-expression-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
        </dependency>
    </dependencies>

第二步创建配置文件spring.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">
  
</beans>

第三步书写一个类ResourceBean

package com.ioc15;

import org.springframework.core.io.Resource;

/**
 * package_name:com.ioc15
 * Author:徐亚远
 * Date:2020/2/14 14:47
 * 项目名:springDemo01
 * Desription:
 **/
public class ResourceBean {
    private Resource resource;

    public Resource getResource() {
        return resource;
    }

    public void setResource(Resource resource) {
        this.resource = resource;
    }
}

第四步 配置spring.xml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="resource1" class="com.ioc15.ResourceBean">
        <property name="resource" value="classpath:ioc15/spring.xml"/>
    </bean>
</beans>

第五步书写测试类

package com.ioc15;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.Resource;
import org.springframework.util.StreamUtils;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * package_name:com.ioc15
 * Author:徐亚远
 * Date:2020/2/14 14:48
 * 项目名:springDemo01
 * Desription:
 **/
public class TestResource {
    public static void main(String[] args) throws IOException {
        ApplicationContext ac = new ClassPathXmlApplicationContext("ioc15/spring.xml");
        ResourceBean resourceBean = (ResourceBean) ac.getBean("resource1");
        Resource resource = resourceBean.getResource();
        System.out.println("文件名称:" + resource.getFilename());
        System.out.println("文件大小:" + resource.contentLength());
        System.out.println("文件是否存在:" + resource.exists());
        InputStream inputStream = resource.getInputStream();
        StreamUtils.copy(inputStream, new FileOutputStream("e:/two.xml"));
    }
}

执行结果如图: