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:

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

9、运行结果

Json output Generator