2.spring_beginning

1.Spring依赖库
 * SPRING_HOME/dist/spring.jar
 * SPRING_HOME/lib/jakarta-commons/commons-logging.jar
 * SPRING_HOME/lib/log4j/log4j-1.2.14.jar
 
2.拷贝Spring的配置文件applicationContext.xml到src下
 * SPRING_HOME/samples/jpetstore/war/WEB-INF/applicationContext.xml
 
3.在UserManager类中提供setter方法，让Spring将实例化发的实现注入给我们

 

4.让Spring管理我们的对象创建，让Spring管理我们的对象间的依赖关系，必需定义Spring配置文件

 

5.编写客户端
 //通过配置文件初始化Bean工厂
 BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");
 
 //通过Bean工厂得到UserManager
 UserManager userManager = (UserManager) factory.getBean("UserManager"); 
 
 userManager.save("张三", "123");
 

Spring IoC的关键：
 * 让Spring管理你的对象，必须将被管理的对象定义在配置文件中
 * 定义setter或构造方法，Spring会将对象注入过来

 

 

=========================================================================

UserManager.java

 

package com.bjsxt.spring.manager;

import com.bjsxt.spring.dao.UserDao;

 

public class UserManager {
 
     private UserDao userDao;
 
     public UserManager(UserDao userDao) {
          this.userDao = userDao;
     }
 
     // public void setUserDao(UserDao userDao) {
     // this.userDao = userDao;
     // }

 

     public void delete(String userid) {

 

     }

 

     public void modify(String userid, String username, String password) {

 

     }

 

     public void save(String username, String password) {
          userDao.save(username, password);
     }

}

 

 

=========================================================================

UserDao.java

 

package com.bjsxt.spring.dao;

 

public interface UserDao {

 

     public void delete(String userid);

 

     public void modify(String userid, String username, String password);

 

     public void save(String username, String password);
}

 

 

=========================================================================

UserDao4MySqlImpl.java

 

package com.bjsxt.spring.dao;

 

public class UserDao4MySqlImpl implements UserDao {

 

      public void delete(String userid) {

 

      }

 

      public void modify(String userid, String username, String password) {

 

      }

 

      public void save(String username, String password) {

           System.out.println("-----------UserDao4MySqlImpl.save-----------");
      }

}

 

 

=========================================================================

UserDao4OracleImpl .java

 

package com.bjsxt.spring.dao;

 

public class UserDao4OracleImpl implements UserDao {

 

       public void delete(String userid) {

 

       }

 

       public void modify(String userid, String username, String password) {

 

       }

 

       public void save(String username, String password) {
              System.out.println("-----------UserDao4OracleImpl.save-----------");
       }

}

 

 

=========================================================================

Client .java

 

package com.bjsxt.spring.client;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bjsxt.spring.manager.UserManager;

 

public class Client {
 
       public static void main(String[] args) {
  
               //通过配置文件初始化Bean工厂
               BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");
  
               //通过Bean工厂得到UserManager
               UserManager userManager = (UserManager) factory.getBean("UserManager"); 
  
               userManager.save("张三", "123");
        }
 
}

 

 

=========================================================================

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="UserDao4MySqlImpl" class="com.bjsxt.spring.dao.UserDao4MySqlImpl"></bean>
 
        <bean id="UserDao4OracleImpl" class="com.bjsxt.spring.dao.UserDao4OracleImpl"></bean>
 
        <bean id="UserManager" class="com.bjsxt.spring.manager.UserManager">
              <!-- 构造方法注入 -->
              <constructor-arg ref="UserDao4MySqlImpl"></constructor-arg>

              <!-- setter注入
              <property name="userDao" ref="UserDao4MySqlImpl"></property>
              -->
       </bean>
</beans>

 

 

 

 

 

 

 

 

 

 

 

 

 

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• 2008-10-10 11:51
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