Spring入门篇注入例子

dao层：

package com.wuyonghu.insert; public interface TestDao { public void getConn(); } package com.wuyonghu.insert; public class TestDaoImpl implements TestDao { public void getConn() { System.out.println("获得了数据库的连接"); } }

service层：

package com.wuyonghu.insert; public interface TestService { public void serviceConn(); } package com.wuyonghu.insert; public class TestServiceImpl implements TestService { private TestDao testDaoImpl; public TestServiceImpl(TestDao testDaoImpl) { this.testDaoImpl = testDaoImpl; } /* * 使用setter注入方式 public void setTestDaoImpl(TestDao testDaoImpl) { * this.testDaoImpl = testDaoImpl; } */ public void serviceConn() { testDaoImpl.getConn(); } }

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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd"> <bean id="testServiceImpl" class="com.wuyonghu.insert.TestServiceImpl"> <!-- <property name="testDaoImpl" ref="testDaoImpl"></property> --> <constructor-arg name="testDaoImpl" ref="testDaoImpl"></constructor-arg> </bean> <bean id="testDaoImpl" class="com.wuyonghu.insert.TestDaoImpl"></bean> </beans>

测试代码：

@Test public void testHello3() { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContext.xml"); TestServiceImpl bean = (TestServiceImpl) context.getBean("testServiceImpl"); bean.serviceConn(); }