了解Spring set依赖注入

1. 新建一个java项目，不是动态Web项目；就是一个简单的java项目；

2. 创建domain模型 User.java

   public class User {
       private int id;
       private String username;
       private String password;
       public int getId() {
           return id;
       }
       public void setId(int id) {
           this.id = id;
       }
       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;
       }
   }

3. 创建lib文件夹，导入下列包，全选右键->”Build Path”->”add …”

   

4. 创建上下文环境配置文件ApplicationContext.xml

   
   <beans xmlns="http://www.springframework.org/schema/beans"
          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-3.0.xsd">
   
       <bean id="userManager" class="cn.com.xalead.spring.UserManager">
           <property name="driverCalss">
               <value>jdbc.msyql.Drivervalue>
           property>
           <property name="username">
               <value>rootvalue>
           property>
           <property name="password">
               <value>rootvalue>
           property>
           <property name="url">
               <value>jdbc:mysql://localhost:3306value>
           property>
       bean>
   
       
       <bean id="userAction" class="cn.com.xalead.spring.UserAction">
           <property name="manager" ref="userManager" />
       bean>
   
   beans>

5. 创建一个UserManager类，模拟对User对象的操作；
   变量username, password, url, driveclass是模仿jdbc连接（没有具体实现连接，只是利用变量实现依赖注入的赋值操作）；

   public class UserManager {
       private String username;
       private String password;
       private String url;
       private String driverCalss;
   
       public void setUsername(String username) {
           this.username = username;
       }
       public void setPassword(String password) {
           this.password = password;
       }
       public void setUrl(String url) {
           this.url = url;
       }
       public void setDriverCalss(String driverCalss) {
           this.driverCalss = driverCalss;
       }
   
       public void add(User user){
           System.out.println(username);
           System.out.println("执行添加User对象的操作!");
       }
   }

6. 创建一个UserAction类，类似MVC三层架构中的controller

   import org.springframework.beans.BeansException;
   import org.springframework.beans.factory.BeanFactory;
   import org.springframework.beans.factory.BeanFactoryAware;
   
   public class UserAction{
       private UserManager manager = null;
       public void setManager(UserManager manager) {
           this.manager = manager;
       }
   
       public String execute(){
           User user = new User();
           manager.add(user);
           return "success";
       }
   }

7. 测试

   import org.springframework.beans.factory.BeanFactory;
   import org.springframework.context.support.ClassPathXmlApplicationContext;
   
   public class MainClass {
   
       public static void main(String[] args) {
           BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");
   //      BeanFactory factory = new ClassPathXmlApplicationContext("app*.xml");
   
           UserAction ua = (UserAction)factory.getBean("userAction");
           System.out.println(ua.execute());
   
       }
   
   }

   测试结果：