Spring框架之容器(applicationContex.xml)

发现贴PPT的内容很麻烦，这里就不贴了，就贴一些课堂笔记和代码吧。O(∩_∩)O~~

简单介绍

1. Spring有两项技术：容器和AOP
2. Spring现在已经从2.5到3.0，现在已经到了4.0版本，但是最好还是从2.5开始学起。
3. 在Spring配置文件applicationContext.xml(当然名字是可以随意取的，但是还是要尽量遵守规范)
4. 通过xml造出BeanFactory拿出bean
5. 更多请见代码中有详细注解

 

简单初识Spring的容器技术

canSpring25Demo

 

Person.java

package cn.hncu.spring25;public class Person {private String name;private Integer age;private Cat cat;public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Cat getCat() {return cat;}public void setCat(Cat cat) {this.cat = cat;}@Overridepublic String toString() {return "Person [name=" + name + ", age=" + age + ", cat=" + cat + "]";}}

 

Cat.java

package cn.hncu.spring25;public class Cat {private String name;public String getName() {return name;}public void setName(String name) {this.name = name;}@Overridepublic String toString() {return "Cat [name=" + name + "]";}}

 

applicationContext.xml

<?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: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-2.5.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"><!-- 默认是单例 --><bean id="p1" class="cn.hncu.spring25.Person"></bean><!-- 配置了scope="prototype"每次都是新new 一个对象，默认是 singleton--><bean id="pp" class="cn.hncu.spring25.Person" scope="prototype"></bean><bean id="p2" class="cn.hncu.spring25.Person"><property name="name" value="Jack"></property><property name="age"><value>33</value></property><property name="cat" ref="cat"></property></bean><bean id="cat" class="cn.hncu.spring25.Cat" ><property name="name" value="Tom"></property></bean></beans>

 

Demo.java

package cn.hncu.spring25;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.xml.XmlBeanFactory;import org.springframework.core.io.ClassPathResource;import org.springframework.core.io.Resource;public class Demo {public static void main(String[] args) {Resource rs=new ClassPathResource("applicationContext.xml");BeanFactory factory=new XmlBeanFactory(rs);Person p1=(Person) factory.getBean("p1");//参数为xml配置bean的idPerson p2=(Person) factory.getBean("p1");System.out.println(p1);System.out.println(p2);System.out.println(p1==p2);System.out.println("-------------------------------");Person p3=(Person) factory.getBean("pp");//参数为xml配置bean的idPerson p4=(Person) factory.getBean("pp");System.out.println(p3);System.out.println(p4);System.out.println(p3==p4);}}

结果图：

 

canSpring30Demo

Person.java

package cn.hncu.domain;import java.util.Arrays;import java.util.List;import java.util.Map;import java.util.Set;public class Person {private String name;private Integer age;private Cat cat;private List<String> list;private Map<String, Object> map;private Set<String> set;private Object[] obj;public Object[] getObj() {return obj;}public void setObj(Object[] obj) {this.obj = obj;}public Set<String> getSet() {return set;}public void setSet(Set<String> set) {this.set = set;}public Map<String, Object> getMap() {return map;}public void setMap(Map<String, Object> map) {this.map = map;}public List<String> getList() {return list;}public void setList(List<String> list) {this.list = list;}public Cat getCat() {return cat;}public void setCat(Cat cat) {this.cat = cat;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}@Overridepublic String toString() {return "Person [name=" + name + ", age=" + age + ", cat=" + cat+ ", list=" + list + ", map=" + map + ", set=" + set + ", obj="+ Arrays.toString(obj) + "]";}}

Cat.java

package cn.hncu.domain;public class Cat {private String name;public String getName() {return name;}public void setName(String name) {this.name = name;}public void eatFish(){System.out.println("I like fish, it is delicious");}@Overridepublic String toString() {return "Cat [name=" + name + "]";}}

applicationContext.xml

<?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: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.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"><bean  class="cn.hncu.domain.Person"><property name="name" value="Space"></property><property name="age" value="20"></property><property name="cat" ref="tigerCat"></property> <property name="list"><list><value>XXX</value><value>YYY</value><value>ZZZ</value></list></property><property name="map"><map><entry key="name" value="Hi"></entry><entry key="age" value="15"></entry></map></property><property name="set"><set><value>111</value><value>222</value><value>333</value></set></property><property name="obj"><array><value>一个字符串</value><ref bean="tigerCat"/><bean class="cn.hncu.domain.Cat"><property name="name" value="Tom"></property></bean><list><value>aaa</value><value>111</value></list></array></property></bean><!-- 外部导入xml中的bean --><import resource="2.xml"/></beans>

 

2.xml

<?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: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.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"><bean id="tigerCat" class="cn.hncu.domain.Cat"><property name="name" value="Tiger"></property></bean></beans>

Demo.java

package cn.hncu.demo;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import cn.hncu.domain.Person;public class Demo {public static void main(String[] args) {//换种方式加载配置文件ApplicationContext ctx=new ClassPathXmlApplicationContext("cn/hncu/demo/applicationContext.xml");Person p=ctx.getBean(Person.class);p.getCat().eatFish();System.out.println(p);}}

 

简单的学生登录：

 

StudDemo.java

package cn.hncu.stud;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import cn.hncu.stud.action.LoginAction;public class StudDemo {public static void main(String[] args) {ApplicationContext ctx=new ClassPathXmlApplicationContext("cn/hncu/stud/stud.xml");LoginAction action=ctx.getBean(LoginAction.class);action.login();}}

 

Stud.xml

<?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: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.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"><bean  class="cn.hncu.stud.action.LoginAction"><property name="service" ref="service"></property></bean><bean id="service" class="cn.hncu.stud.service.IStudServiceImpl"><property name="orclDao" ref="orcl"></property></bean><!-- 如果想把改用jdbc方式访问，那么把该段的注释去掉 且 把上一段有关orcl的注入注释上<bean id="service" class="cn.hncu.stud.service.IStudServiceImpl"><property name="jdbcDao" ref="orcl"></property></bean> --><bean id="jdbcDao" class="cn.hncu.stud.dao.IStudJdbcDao"></bean><bean id="orclDao" class="cn.hncu.stud.dao.IStudOrclDao"></bean></beans>

LoginAction.java

package cn.hncu.stud.action;import cn.hncu.stud.service.IStudService;public class LoginAction {//依赖Spring注入service接口,可以不用再new 实现类，但是set和get方法必须要写private IStudService service=null;public void login(){service.login();}public IStudService getService() {return service;}public void setService(IStudService service) {this.service = service;}}

IStudService.java

package cn.hncu.stud.service;public interface IStudService {public void login();}

 

IStudServiceImpl.java

package cn.hncu.stud.service;import cn.hncu.stud.dao.IStudDAO;public class IStudServiceImpl implements IStudService{//依赖Spring注入service接口,可以不用再new 实现类，但是set和get方法必须要写private IStudDAO dao=null;@Overridepublic void login() {dao.login();}public IStudDAO getDao() {return dao;}public void setDao(IStudDAO dao) {this.dao = dao;}}

 

IStudDAO.java

package cn.hncu.stud.dao;public interface IStudDAO {public void login();}

 

IStudJdbcDAO.java

package cn.hncu.stud.dao;public class IStudJdbcDao implements IStudDAO{@Overridepublic void login() {System.out.println("student  is   login  ----jdbc");}}

 

IStudOrclDao.java

package cn.hncu.stud.dao;public class IStudOrclDao implements IStudDAO{@Overridepublic void login() {System.out.println("student  is   login  ----Orcl");}}

 

有了Spring技术以后，实现service和dao的注入，就不再需要依赖实现类了(但要写接口的set和get方法)，而且通过xml就可以配置，代码不需要改变，符合开闭原则。