javascript
Spring入门-1-基本配置和IOC、DI
需要引入的jar
spring-4.3.10: D:\spring-framework-4.3.10.RELEASE-dist\spring-framework-4.3.10.RELEASE\libs
commons-logging: D:\struts-2.5.10.1-all\struts-2.5.10.1\lib
JUnit 4:
IOC:
? ? ? ? 某一接口具體實(shí)現(xiàn)類的選擇控制權(quán)從調(diào)用類中移除,轉(zhuǎn)交給第三方?jīng)Q定。?
? ? ??? 因?yàn)镮oC確實(shí)不夠開門見山,因此業(yè)界曾進(jìn)行了廣泛的討論,最終軟件界的泰斗級人物Martin Fowler提出了DI(依賴注入:Dependency Injection)的概念用以代替IoC,即讓調(diào)用類對某一接口實(shí)現(xiàn)類的依賴關(guān)系由第三方(容器或協(xié)作類)注入,以移除調(diào)用類對某一接口實(shí)現(xiàn)類的依賴。“依賴注入”這個名詞顯然比“控制反轉(zhuǎn)”直接明了、易于理解。?
? ? ? ?
//Dependency Injection:DI:依賴注入:UserService的add()依賴于容器注入的DAO //Inverse of Control:IOC:控制反轉(zhuǎn):(兩種解釋方法)1、初始化的控制從程序里面反轉(zhuǎn)到容器里面。2、控制具體實(shí)現(xiàn)反轉(zhuǎn)為控制抽象,即面向接口編程? ? ? ?詳細(xì)可以參考:http://stamen.iteye.com/blog/1489223/
demo:
實(shí)體類:
package com.bjsxt.model;public class User {private String username;private String password;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;} }數(shù)據(jù)訪問類:
package com.bjsxt.dao; import com.bjsxt.model.User;public interface UserDAO {public void save(User user); }
package com.bjsxt.dao.impl;import com.bjsxt.dao.UserDAO; import com.bjsxt.model.User;public class UserDAOImpl implements UserDAO {public void save(User user) {//Hibernate//JDBC//XML//NetWorkSystem.out.println("user saved!");}}
控制類:
package com.bjsxt.service; import com.bjsxt.dao.UserDAO; import com.bjsxt.model.User;public class UserService {private UserDAO userDAO; public void add(User user) {userDAO.save(user);}public UserDAO getUserDAO() {return userDAO;}public void setUserDAO(UserDAO userDAO) {this.userDAO = userDAO;} }
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsd"><bean id="u" class="com.bjsxt.dao.impl.UserDAOImpl"></bean><bean id="userService" class="com.bjsxt.service.UserService"><property name="userDAO" ref="u" /></bean> </beans>
package com.bjsxt.service; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.context.ConfigurableApplicationContext;import com.bjsxt.model.User;//Dependency Injection:DI:依賴注入:UserService的add()依賴于容器注入的DAO //Inverse of Control:IOC:控制反轉(zhuǎn):(兩種解釋方法)1、初始化的控制從程序里面反轉(zhuǎn)到容器里面。2、控制具體實(shí)現(xiàn)反轉(zhuǎn)為控制抽象,即面向接口編程 public class UserServiceTest {@Testpublic void testAdd() throws Exception {ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");UserService service = (UserService)ctx.getBean("userService");User u = new User();u.setUsername("zhangsan");u.setPassword("zhangsan");service.add(u);((ConfigurableApplicationContext)ctx).close();}}
?詳細(xì)可以參考:http://stamen.iteye.com/blog/1489223/或者《Spring 4.x企業(yè)應(yīng)用開發(fā)實(shí)戰(zhàn)》的第3章
總結(jié)
以上是生活随笔為你收集整理的Spring入门-1-基本配置和IOC、DI的全部內(nèi)容,希望文章能夠幫你解決所遇到的問題。
- 上一篇: Excel设置选项按钮
- 下一篇: JS-开启麦克风和摄像头权限