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  • Spring入门之setter DI注入

    1、新建Java项目导入依赖jar包,参考前一章


    2、以不同文件格式输出为例


    3、定义接口IOutputGenerator.java


    package com.spring.output;
    
    public interface IOutputGenerator {
    		public void generateOutput();
    }
    

    4、CsvOutputGenerator和JsonOutputGenerator类,分别实现接口

    CsvOutputGenerator.java

    package com.spring.output;
    
    public class CsvOutputGenerator implements IOutputGenerator{
    
    	@Override
    	public void generateOutput() {
    		// TODO Auto-generated method stub
    		System.out.println("CSV output Generator");
    	}
    
    }
    

    JsonOutputGenerator.java

    package com.spring.output;
    
    public class JsonOutputGenerator implements IOutputGenerator{
    
    	@Override
    	public void generateOutput() {
    		// TODO Auto-generated method stub
    		System.out.println("Json output Generator");
    	}
    
    }

    5、编写辅助类,通过setter注入

    OutputHelper.java

    package com.spring.output;
    
    public class OutputHelper {
    	
    	IOutputGenerator outputGenerator;
    	public void generateOutput(){
    		outputGenerator.generateOutput();
    	}
    	public void setOutputGenerator(IOutputGenerator outputGenerator) {
    		this.outputGenerator = outputGenerator;
    	}
    }
    

    6、编辑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"
    	xmlns:p="http://www.springframework.org/schema/p"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
    	<bean id="OutputHelper" class="com.spring.output.OutputHelper">
    		<property name="outputGenerator" ref="JsonOutputGenerator"></property>
    	</bean>
    	<bean id="CsvOutputGenerator" class="com.spring.output.CsvOutputGenerator"></bean>
    	<bean id="JsonOutputGenerator" class="com.spring.output.JsonOutputGenerator"></bean>
    </beans>


    7、测试:

    package com.spring.output;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Test {
    
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		ApplicationContext content = new ClassPathXmlApplicationContext("beans.xml");
    		OutputHelper outputHelper = (OutputHelper) content.getBean("OutputHelper");
    		outputHelper.generateOutput();
    	}
    
    }
    

    8、可修改beans.xml中的ref的值
    <property name="outputGenerator" ref=""></property>

    9、运行结果

    Json output Generator


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  • 原文地址:https://www.cnblogs.com/pilihaotian/p/8823114.html
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