Spring4.0MVC学习资料,注解自动扫描bean,自动注入bean(二)

Spring4.0的新特性我们在上一章已经介绍过了。包括它对jdk8的支持，Groovy Bean Definition DSL的支持，核心容器功能的改进，Web开发改进，测试框架改进等等。这张我们主要介绍spring4.0的自动扫描功能，以及对bean的过滤等特性进行学习。

好吧，废话少说，我们来看看代码吧。

package com.herman.ss.test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.herman.ss.action.TestAction;import com.herman.ss.filter.Filter1;import com.herman.ss.filter.Filter2;import com.herman.ss.filter.test.Filter3;import com.herman.ss.pojo.House;import com.herman.ss.pojo.Person;/** * @see spring4.0.0最新稳定版新特性,自动扫描bean,自动注入bean * @author Herman.Xiong * @date 2014年7月18日14:49:42 */public class Test1 {/** * @see spring4.0自动扫描bean,自动注入bean */public static void test0(){//1.加载配置文件ApplicationContext ctx=new ClassPathXmlApplicationContext("com/herman/ss/config/applicationContext1.xml");//2.获取bean实例Person person=(Person)ctx.getBean("person");House house=(House)ctx.getBean("house");//3.打印bean属性System.out.println(person);System.out.println(house);}/** * @see spring4.0简单业务逻辑的注解 */public static void test1(){//1.加载配置文件ApplicationContext ctx=new ClassPathXmlApplicationContext("com/herman/ss/config/applicationContext1.xml");//2.获取bean实例 获取beanTestAction testAction=(TestAction)ctx.getBean("testAction");//3.打印bean属性System.out.println(testAction);//4.调用bean对象的方法testAction.testAction();//@Service 用于标注业务层组件；//@Repository 用于标注数据访问层组件；//@Controller 用于标注控制层组件(如：Struts中的action)//@Component 表示泛型组件，当组件不好归类的时候，我们可以使用这个组件进行注解。}/** * @see spring4.0简单注解的排除过滤器配置 */public static void test2(){//1.加载配置文件ApplicationContext ctx=new ClassPathXmlApplicationContext("com/herman/ss/config/applicationContext1.xml");//2.获取bean实例,只能根据bean的id获取beanFilter1 filter1=(Filter1)ctx.getBean("filter1");Filter2 filter2=(Filter2)ctx.getBean("filter2");//3.打印bean属性System.out.println(filter1);System.out.println(filter2);/** * 运行会报错：Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'filter2' is defined * 原因是：filter2被我们排除在外了，不会自动注入 * 因此会抛异常 */}/** * @see spring4.0简单注解的包含过滤器配置 */public static void test3(){//1.加载配置文件ApplicationContext ctx=new ClassPathXmlApplicationContext("com/herman/ss/config/applicationContext1.xml");//2.获取bean实例Filter3 filter3=(Filter3)ctx.getBean("filter3");Filter2 filter2=(Filter2)ctx.getBean("filter2");Filter1 filter1=(Filter1)ctx.getBean("filter1");//3.打印bean属性System.out.println(filter3);System.out.println(filter2);System.out.println(filter1);/** * 运行会报错：Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'filter2' is defined * 原因：filter2 被我们排除在外了 * 因此：我们回去filter2  这个bean对象的时候就会报错。 * filter1  为什么不报错呢，因为我们设置了 com.herman.ss.filter包下面的use-default-filters="true"  自动导入 * 因此：filter1 不会报错 */}public static void main(String[] args) {/** * 注解需要的jar包列举： * spring-aop-4.0.6.RELEASE.jar * spring-beans-4.0.6.RELEASE.jar * spring-context-4.0.6.RELEASE.jar * spring-core-4.0.6.RELEASE.jar * spring-expression-4.0.6.RELEASE.jar * commons-lang-2.4.jar *///test0();//test1();//test2();test3();}}

配置文件源码：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"      xmlns:mvc="http://www.springframework.org/schema/mvc"      xmlns:context="http://www.springframework.org/schema/context"      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"      xsi:schemaLocation="http://www.springframework.org/schema/beans  http://www.springframework.org/schema/beans/spring-beans-4.0.xsd  http://www.springframework.org/schema/mvc  http://www.springframework.org/schema/mvc/spring-mvc.xsd  http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-4.0.xsd">             <!-- 打开Spring组件自动扫面，并配置要扫描的基本包 -->      <context:component-scan base-package="com.herman.ss.pojo"></context:component-scan>    <context:component-scan base-package="com.herman.ss.action"></context:component-scan>    <context:component-scan base-package="com.herman.ss.biz"></context:component-scan>    <context:component-scan base-package="com.herman.ss.dao"></context:component-scan>    <context:component-scan base-package="com.herman.ss.filter" use-default-filters="false">    <!-- 取消自动注入，配置只注入com.herman.ss.filter.test下面的所有类 -->    <context:include-filter type="regex" expression="com.herman.ss.filter.test.*"/>    </context:component-scan>     <context:component-scan base-package="com.herman.ss.filter" use-default-filters="true">    <!-- 自动注入，但是Filter2除外 -->    <context:exclude-filter type="regex" expression="com.herman.ss.filter.Filter2" />     </context:component-scan><!-- 注：<context:component-scan>节点用于通知Spring容器扫描组件，base-package属性用于指定将要被扫描的组件所在的包名这里将自动的配置扫描com.herman.ss.pojo下面的bean --></beans>

实体类源码：

package com.herman.ss.pojo;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;/** * @see 实体类使用Component注解 * @author Herman.Xiong * @date 2014年7月24日17:11:59 */@Component("person")public class Person {private String name;private int age;//这里设置自动注入@Autowiredprivate House house;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public House getHouse() {return house;}public void setHouse(House house) {this.house = house;}public Person() {super();}public Person(String name, int age) {super();this.name = name;this.age = age;}public Person(String name, int age, House house) {super();this.name = name;this.age = age;this.house = house;}@Overridepublic String toString() {return "Person [age=" + age + ", house=" + house + ", name=" + name+ "]";}}

House.java源码：

package com.herman.ss.pojo;import org.springframework.stereotype.Component;@Component("house")public class House {private String name;private String address;private float price;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}public float getPrice() {return price;}public void setPrice(float price) {this.price = price;}public House() {super();}public House(String name, String address, float price) {super();this.name = name;this.address = address;this.price = price;}public String toString() {return "House [address=" + address + ", name=" + name + ", price="+ price + "]";}}

package com.herman.ss.action;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import com.herman.ss.biz.TestBiz;/** * @see 模拟action * @author Herman.Xiong * @date 2014年7月24日17:17:16 * @since jdk 1.6,tomcat 6.0 */@Controller("testAction")public class TestAction {//使用自动载入@Autowiredprivate TestBiz testBiz;//必须提供set方法public void setTestBiz(TestBiz testBiz) {this.testBiz = testBiz;}public TestAction(){System.out.println("模拟的action类");}public void testAction(){testBiz.testBiz();}}

package com.herman.ss.biz;/** * @see 模拟biz层进行注解 * @author Herman.Xiong * @date 2014年7月24日17:20:25 */public interface TestBiz {void testBiz();}

package com.herman.ss.biz.impl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.herman.ss.biz.TestBiz;import com.herman.ss.dao.TestDao;@Service("testBiz")public class TestBizImpl implements TestBiz{@Autowiredprivate TestDao testDao;//必须提供set方法public void setTestDao(TestDao testDao) {this.testDao = testDao;}public void testBiz() {System.out.println("模拟biz层");testDao.testDao();}}

package com.herman.ss.dao;/** * @see 模拟dao层进行注解 * @author Herman.Xiong * @date 2014年7月24日17:20:25 */public interface TestDao {void testDao();}

package com.herman.ss.dao.impl;import org.springframework.stereotype.Repository;import com.herman.ss.dao.TestDao;@Repository("testDao")public class TestDaoImpl implements TestDao{public void testDao() {System.out.println("模拟dao层");}}

package com.herman.ss.filter;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;//Scope注解设置作用域@Controller("filter1")@Scope("prototype")public class Filter1 {public Filter1(){System.out.println("我是Filter1 ...");System.out.println("Scope注解设置作用域");}}

package com.herman.ss.filter.test;import org.springframework.stereotype.Controller;@Controller("filter3")public class Filter3 {public Filter3(){System.out.println("我是filter3");}}

package com.herman.ss.filter;import org.springframework.stereotype.Controller;@Controller("filter2")public class Filter2 {public Filter2(){System.out.println("我是Filter2 ...");}}

欢迎大家关注我的个人博客！！！！

如有不懂，疑问或者欠妥的地方，请加QQ群：135430763   进行反馈，共同学习！