使用idea搭建spring项目,利用xml文件的形式进行配置方式

	<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.3.25</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.3.25</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.3.25</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.25</version>
        </dependency>

        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.26</version>
        </dependency>
    </dependencies>

public interface Ink {
    public String getColor();
}

public interface Paper {
    public String getContent();
    public void putInChars(String content);
}

public class ColorInk implements Ink {
    private int red = 10;
    private int green = 20;
    private int blue = 30;

    @Override
    public String getColor() {
        Color color = new Color(this.red,this.green,this.blue);
        return "#"+Integer.toHexString(color.getRGB()).substring(2);
    }
}

public class GreyInk implements Ink {
    private int red = 20;
    private int green = 30;
    private int blue = 40;

    @Override
    public String getColor() {
        int c = (this.red+this.green+this.blue)/3;
        Color color = new Color(c,c,c);
        return "#"+Integer.toHexString(color.getRGB()).substring(2);
    }
}

public class TextPaper implements Paper {
    private int charPerLine = 10;
    private int linePerLine = 8;
    private String content;

    @Override
    public String getContent() {
        String out = "每行字符数"+ this.charPerLine +"\n";
        out += "每页行数" + this.linePerLine + "\n";
        out += this.content;
        return out;
    }

    @Override
    public void putInChars(String content) {
        this.content = content;
    }
}

@Data
@NoArgsConstructor
public class Printer {
    private Ink ink;
    private Paper paper;

    public void print(String str) {
        System.out.println("使用"+ink.getColor()+"颜色打印");
        paper.putInChars(str);
        System.out.println(paper.getContent());
    }
}

<?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">
	<!--定义bean-->
    <bean id="greyInk" class="com.hq.GreyInk" />
    <bean id="colorInk" class="com.hq.ColorInk" />

    <bean id="textPaper" class="com.hq.TextPaper" />
	<!--在printer中注入ink和paper，ink使用greyInk，paper使用textPaper，此处利用面向接口编程的思想-->
    <bean id="printer" class="com.hq.Printer">
        <property name="ink" ref="greyInk" />
        <property name="paper" ref="textPaper" />
    </bean>
</beans>

public class TestPrinter {
    public static void main(String[] args) {
    	// 通过配置文件启动容器
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-config.xml");
        // printer即为定义的bean，此时注入的是greyInk
        Printer printer = (Printer) context.getBean("printer");
        printer.print("hello world!");
    }
}

<bean id="printer" class="com.hq.Printer">
   <property name="ink" ref="colorInk" />
   <property name="paper" ref="textPaper" />
</bean>

	<bean id="ColorInk" class="com.hq.ColorInk">
		<!--使用<property>标签进行定义，name属性为指定类中的属性，value属性为其赋值。-->
        <property name="red" value="10" />
        <property name="green" value="20" />
        <property name="blue" value="30" />
    </bean>

    <bean id="greyInk" class="com.hq.GreyInk">
        <property name="red" value="20" />
        <property name="green" value="30" />
        <property name="blue" value="40" />
    </bean>

    <bean id="textPaper" class="com.hq.TextPaper">
    	<!--通过构造函数注入-->
        <constructor-arg value="10" />
        <constructor-arg value="8" />
    </bean>

    <bean id="printer" class="com.hq.Printer">
        <constructor-arg ref="greyInk" />
        <constructor-arg ref="textPaper" />
    </bean>