java_spring_依赖注入（构造器）

来源：互联网发布：淘宝的竞争对手编辑：程序博客网时间：2024/05/06 10:23

依赖注入对象可以手工装配（建议）和自动装配

package com.PersonDaoBean.test;public interface PersonDao {public abstract void add();}

package com.PersonDaoBean.test;public class PersonDaoBean implements PersonDao {@Overridepublic void add(){System.out.println("PersonDaoBean执行。。。。。。。。。。。。。。。。。");}}

package com.dao.bean.www;public interface PersonServiceDao {public abstract void save();}

package com.bean.www;import com.PersonDaoBean.test.PersonDao;import com.dao.bean.www.PersonServiceDao;public class PersonServiceBean implements PersonServiceDao {private PersonDao personDao;private String name;public PersonServiceBean(PersonDao personDao, String name) {this.personDao = personDao;this.name = name;}public void save() {personDao.add();System.out.println(name);}}

//配置方法

<?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"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><bean id="personDao" class="com.PersonDaoBean.test.PersonDaoBean"></bean><bean id="personService" class="com.bean.www.PersonServiceBean"><constructor-arg index="0" type="com.PersonDaoBean.test.PersonDao" ref="personDao"></constructor-arg><constructor-arg index="1" value="valueString"></constructor-arg></bean></beans>

//Test Class

package com.itcast.www;import static org.junit.Assert.*;import org.junit.BeforeClass;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.dao.bean.www.PersonServiceDao;public class TestCaseDemo {@BeforeClasspublic static void setUpBeforeClass() throws Exception {}@Testpublic void instanceSpring() {ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");PersonServiceDao personService = (PersonServiceDao) ctx.getBean("personService");personService.save();}}

0 0