Spring

1.School类

package top.wyyblog.DI5;

public class School {

 private String name;  

public void setName(String name) {

  this.name = name; 

}

 @Override 

public String toString() { 

 return "School [name=" + name + "]"; 

}

}

2.Student类

package top.wyyblog.DI5;

public class Student { 

private String name; 

private int age; 

private School school;

 public Student() {

 }

 public void setName(String name) { 

 this.name = name;

 }  

public void setAge(int age) { 

 this.age = age;

 }

 public void setSchool(School school) { 

 this.school = school;

 }  

@Override

 public String toString() { 

 return "Student [name=" + name + ", age=" + age + ", school=" + school + "]"; 

}

}

3.测试类

package top.wyyblog.DI5;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestDemo {

 public static void main(String[] args) {  

ApplicationContext context = new ClassPathXmlApplicationContext("top/wyyblog/DI5/applicationContext.xml");  

Student student = (Student) context.getBean("student");  

System.out.println(student); 

}

}

4.自动注入(applicationContext.xml配置文件)

        （a）. byName自动注入

<bean id="school" class="top.wyyblog.DI5.School">  

<property name="name" value="极速学院">

</property>

 </bean> 

<!-- autowire="byName"会从容器中查找与实体类的域属性同名的Bean 的id，   并将该Bean对象自动注入给该域属性 -->   

<bean id="student" class="top.wyyblog.DI5.Student" autowire="byName"> 

    <property name="name" value="李四">

</property>     

<property name="age" value="80">

</property>   

</bean>

 （b）. byType自动注入

<bean id="school2" class="top.wyyblog.DI6.School"> 

 <property name="name" value="极速学院">

</property>

 </bean>

 <!-- autowire="byType"会从容器中查找与实体类的域属性类型具有 is-a 关系的Bean，   并将该Bean对象自动注入给该域属性 -->   

<bean id="student" class="top.wyyblog.DI6.Student" autowire="byType">   

 <property name="name" value="李四">

</property>   

 <property name="age" value="80"></property>  

  </bean>

 

一)静态代理： 

1.Count.java

[java] view plaincopy

 

 

 

1. <span style="font-size:16px;">package net.battier.dao;    
2. /**   
3.  * 定义一个账户接口   
4.  *    
5.  * @author Administrator   
6.  *    
7.  */     
8. public interface Count {     
9.     // 查看账户方法     
10.     public void queryCount();     
11.     // 修改账户方法     
12.     public void updateCount();      
13. }   </span>  

2.CountImpl.java

 

 

[java] view plaincopy

 

 

 

1. package net.battier.dao.impl;     
2. import net.battier.dao.Count;     
3. /**   
4.  * 委托类(包含业务逻辑)   
5.  *    
6.  * @author Administrator   
7.  *    
8.  */     
9. public class CountImpl implements Count {  
10.     @Override     
11.     public void queryCount() {     
12.         System.out.println("查看账户方法...");     
13.     }     
14.     @Override     
15.     public void updateCount() {   
16. System.out.println("修改账户方法...");     
17.     }     
18. }     

  

1. package net.battier.dao.impl;     
2.      
3. import net.battier.dao.Count;     
4.      
5. /**   
6.  * 这是一个代理类（增强CountImpl实现类）   
7.  *    
8.  * @author Administrator   
9.  *    
10.  */     
11. public class CountProxy implements Count {     
12.     private CountImpl countImpl;     
13.      
14.     /**   
15.      * 覆盖默认构造器   
16.      *    
17.      * @param countImpl   
18.      */     
19.     public CountProxy(CountImpl countImpl) {     
20.         this.countImpl = countImpl;     
21.     }     
22.      
23.     @Override     
24.     public void queryCount() {     
25.         System.out.println("事务处理之前");     
26.         // 调用委托类的方法;     
27.         countImpl.queryCount();     
28.         System.out.println("事务处理之后");     
29.     }     
30.      
31.     @Override     
32.     public void updateCount() {     
33.         System.out.println("事务处理之前");     
34.         // 调用委托类的方法;     
35.         countImpl.updateCount();     
36.         System.out.println("事务处理之后");     
37.      
38.     }     
39.      
40. }  

41.  

     

     

    4.TestCount.java

     

     

    1. Java代码   
    2. package net.battier.test;     
    3. import net.battier.dao.impl.CountImpl;     
    4. import net.battier.dao.impl.CountProxy;     
    5. /**   
    6.  *测试Count类   
    7.  *    
    8.  * @author Administrator   
    9.  *    
    10.  */     
    11. public class TestCount {     
    12.     public static void main(String[] args) {     
    13.         CountImpl countImpl = new CountImpl();     
    14.         CountProxy countProxy = new CountProxy(countImpl);     
    15.         countProxy.updateCount();     
    16.         countProxy.queryCount();     
    17.     }     
    18. }    

来源：https://www.cnblogs.com/wang01/p/11753972.html