在java开发中有时候我们的一个类需要依赖另外一个类，这种就是依赖关系，创建对象的工作一般由spring容器来完成然后注入给调用者，这种就是依赖注入。

所需要jar文件：http://download.csdn.net/download/six_666666/9959800

文件结构

案例

Boss.java类

public class Boss {


@Resource
public Employee employee; // 依赖

public void _do() {
employee.job();
}

Employee.java类

public class Employee {
public void job() {
System.err.println("do job-->");
}
}

Test.java测试类

public class Test {


public static void main(String[] args) {
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("ioc/spring.xml");
Boss boss = null;
boss = (Boss) ac.getBean("boss2");
boss._do();
}
}

主配置文件

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop 
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx 
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
">
<bean id="user" class="ioc.User"/>
<context:component-scan base-package="di" />
</beans>

测试结果