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一个简单的Spring例子来展示如何通过setter方法注入依赖项，最常用DI方法注入bean。
1 package faj.test.javademo.set; 2 3 /** 4 * Created by JiaGao on 2016/7/30. 5 */ 6 public interface IOutputGenerator { 7 void generateOutput(); 8 }
1 package faj.test.javademo.set; 2 3 /** 4 * Created by JiaGao on 2016/7/30. 5 */ 6 public class CsvOutputGenerator implements IOutputGenerator { 7 @Override 8 public void generateOutput() { 9 System.out.println("This is Csv Output Generator"); 10 } 11 }
1 package faj.test.javademo.set; 2 3 public class OutputHelper { 4 private IOutputGenerator outputGenerator; 5 public void generateOutput() { 6 outputGenerator.generateOutput(); 7 } 8 //DI via setter method 9 public void setOutputGenerator(IOutputGenerator outputGenerator) { 10 this.outputGenerator = outputGenerator; 11 } 12 }
在这种情况下，Spring将通过setter方法注入Bean “CsvOutputGenerator” 到“OutputHelper”类，
“setOutputGenerator(IOutputGenerator outputGenerator)”.
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:context="http://www.springframework.org/schema/context" 4 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 5 xsi:schemaLocation="http://www.springframework.org/schema/beans 6 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 7 http://www.springframework.org/schema/context 8 http://www.springframework.org/schema/context/spring-context-2.5.xsd"> 9 <bean id="CsvOutputGenerator" class="faj.test.javademo.set.CsvOutputGenerator" /> 10 11 <bean id="OutputHelper" class="faj.test.javademo.set.OutputHelper"> 12 <property name="outputGenerator" ref="CsvOutputGenerator" /> 13 </bean> 14 </beans>
1 package faj.test.javademo.set; 2 3 import org.springframework.context.ApplicationContext; 4 import org.springframework.context.support.ClassPathXmlApplicationContext; 5 6 /** 7 * Created by JiaGao on 2016/7/30. 8 */ 9 public class App1 { 10 public static void main(String[] args) { 11 ApplicationContext context = new ClassPathXmlApplicationContext("faj/test/javademo/set/applicationContext.xml"); 12 OutputHelper output = (OutputHelper)context.getBean("OutputHelper"); 13 output.generateOutput(); 14 } 15 }
输出结果
This is Csv Output Generator
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原文地址：http://www.cnblogs.com/faunjoe88/p/5721467.html
