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下面是一个spring注入的简单demo

建一个包为 com.lzyer.ouput下面接口

package com.lzyer.ouput;public interface IOutputGenerator {	public void generateOutput();}

package com.lzyer.ouput.impl;import com.lzyer.ouput.IOutputGenerator;public class CsvOutputGenerator implements IOutputGenerator{	public void generateOutput() {				System.out.println("This is csv ouputgenerator...");	}}

package com.lzyer.ouput.test;import com.lzyer.ouput.IOutputGenerator;public class OutputHelper {	IOutputGenerator outputGenerator;		public void outputGenerator(){		outputGenerator.generateOutput();	}	//构造注入	public OutputHelper(IOutputGenerator outputGenerator){				this.outputGenerator = outputGenerator;	} /*	设置注入  * public void setOutputGenerator(IOutputGenerator outputGenerator) {		this.outputGenerator = outputGenerator;	}	*/	}

public class App {	public static void main(String[] args) {	  		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");		OutputHelper helper = (OutputHelper)context.getBean("helper");		helper.outputGenerator();	}}

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