菜鳥學(xué)習(xí)Spring――第一個(gè)例子
來源：程序員人生 發(fā)布時(shí)間：2014-10-08 08:00:00 閱讀次數(shù)：2687次
一、概述
原來我們利用工廠來實(shí)現(xiàn)靈活的配置。現(xiàn)在利用Spring以后把這個(gè)交給了IoC容器管理。我們只要在XML文件上配上就可以了這樣的話就節(jié)省了很多開發(fā)時(shí)間我們不需要知道后面的有多少只要?jiǎng)討B(tài)的配上類就可以了下面就給大家做一個(gè)例子
二、代碼展示。
文件目錄如下圖：
需要引用的jar包：
spring.jar
Lib/log4j/log4j.jar
Lib/jakarta-commons/commons-logging.jar
需要引用的文件
Log4j.properties
下面是代碼：
UserDao.java
package com.bjpowernode.spring.dao;
public interface UserDao {
public void addUser(String userName,String password);
}
UserDao4MySqlImpl.java
package com.bjpowernode.spring.dao;
public class UserDao4MySqlImpl implements UserDao {
public void addUser(String userName, String password) {
// TODO Auto-generated method stub
System.out.println("UserDao4MySqlImpl.addUser()");
}
}
UserDao4OrcleImpl.java
package com.bjpowernode.spring.dao;
public class UserDao4OrcleImpl implements UserDao {
public void addUser(String userName, String password) {
// TODO Auto-generated method stub
System.out.println("UserDao4OrcleImpl.addUser()");
}
}
UserManager.java
package com.bjpowernode.spring.manager;
public interface UserManager {
public void addUser(String userName,String password);
}
UserManagerImpl.java
package com.bjpowernode.spring.manager;
import com.bjpowernode.spring.dao.UserDao;
public class UserManagerImpl implements UserManager{
private UserDao userDao;
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
// public UserManagerImpl(UserDao userDao) {
//
// this.userDao = userDao;
// }
public void addUser(String userName, String password) {
// TODO Auto-generated method stub
// //由我們的應(yīng)用程序負(fù)責(zé)服務(wù)定位
// UserDao userDao=new UserDao4MySqlImpl();
userDao.addUser(userName, password);
}
}
Client.java
package com.bjpowernode.spring.client;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.bjpowernode.spring.dao.UserDao4MySqlImpl;
import com.bjpowernode.spring.manager.UserManager;
import com.bjpowernode.spring.manager.UserManagerImpl;
public class Client {
/**
* @param args
*/
public static void main(String[] args) {
BeanFactory factory=new ClassPathXmlApplicationContext("applicationContext.xml");
UserManager userManager=(UserManager) factory.getBean("userManager");
userManager.addUser("張三", "123");
// // TODO Auto-generated method stub
// UserManager userManager=new UserManagerImpl(new UserDao4MySqlImpl());
// userManager.addUser("張三", "1231");
}
}
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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
<bean id="userDao4MySql" class="com.bjpowernode.spring.dao.UserDao4MySqlImpl"/>
<bean id="userDao4Orcle" class="com.bjpowernode.spring.dao.UserDao4OrcleImpl"/>
<bean id="userManager" class="com.bjpowernode.spring.manager.UserManagerImpl">
<!-- <constructor-arg ref="userDao4MySql" /> -->
<property name="userDao" ref="userDao4MySql"/>
</bean>
</beans>
運(yùn)行結(jié)果：
三、比較
與原來用工廠寫的區(qū)別就在于UserManagerImpl.java和Client.java這兩個(gè)類的寫法不一樣原來這兩個(gè)類這樣寫
UserManagerImpl.java
package com.bjpowernode.spring.manager;
import com.bjpowernode.spring.dao.UserDao;
import com.bjpowernode.spring.dao.UserDao4MySqlImpl;
public class UserManagerImpl implements UserManager{
public void addUser(String userName, String password) {
// TODO Auto-generated method stub
//由我們的應(yīng)用程序負(fù)責(zé)服務(wù)定位
UserDao userDao=new UserDao4MySqlImpl();
userDao.addUser(userName, password);
}
}
Client.java
package com.bjpowernode.spring.client;
import com.bjpowernode.spring.manager.UserManager;
import com.bjpowernode.spring.manager.UserManagerImpl;
public class Client {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
UserManager userManager=new UserManagerImpl();
userManager.addUser("張三", "1231");
}
}
四、總結(jié)
Spring給我們帶來了很大的便利這樣讓我們開發(fā)的時(shí)候?qū)ο笈c對(duì)象之間進(jìn)行了解耦。讓我們維護(hù)起來更加方便，當(dāng)需求修改的時(shí)候我們只要修改一下配置文件，添加對(duì)象就可以了不用修改寫好的代碼。
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