本文主要是介绍Spring4.0注入bean的新方法，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
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。
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 ...");}
}
原网页地址：http://www.itnose.net/detail/6078862.html#0-youdao...
这篇关于Spring4.0注入bean的新方法的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
