用注解的方式注入bean，spring的配置文件也要增加一些約束和導入注解所在的包

applicationContext.xml

1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xsi:schemaLocation="http://www.springframework.org/schema/beans 6 http://www.springframework.org/schema/beans/spring-beans.xsd 7 http://www.springframework.org/schema/context 8 http://www.springframework.org/schema/context/spring-context.xsd"> 9 10 <context:component-scan base-package="com.xiaostudy.service"></context:component-scan> 11 <context:component-scan base-package="com.xiaostudy.dao"></context:component-scan> 12 </beans>

用注解注入的bean類PersonImple.java

1 package com.xiaostudy.service; 2 3 import javax.annotation.PostConstruct; 4 import javax.annotation.PreDestroy; 5 import javax.annotation.Resource; 6 7 import org.springframework.beans.factory.annotation.Value; 8 import org.springframework.context.annotation.Scope; 9 import org.springframework.stereotype.Component; 10 /* 11 * bean注入 12 * 1、@Component("id") 13 * 2、WEB: 14 * @Controller("id") web 15 * @Service("id") service 16 * @Repository("id") dao 17 */ 18 @Component("person") 19 /* 20 * bean作用域 21 * @Scope("singleton") 單例（也是默認） 22 * @Scope("prototype") 每new一次都是新的對象 23 */ 24 @Scope("prototype") 25 public class PersonImple implements Person { 26 /* 27 * bean參數注入 28 * 1、普通參數（也就是說那些基本數據類型） 29 * 在參數上面或者在相應的set方法 @Value("值") 30 * 2、引用參數 31 * 2.1按照類型注入：@Autowired 32 * 2.2按照名稱注入：@Autowired @Qualifier("id") 33 * 2.3按照名稱注入：@Resource 34 * 35 */ 36 //@Resource 37 private Dao_demoImple dao_demo; 38 @Value("xiaostudy") 39 private String name; 40 41 42 public String getName() { 43 return name; 44 } 45 46 public void setName(String name) { 47 this.name = name; 48 } 49 50 public Dao_demoImple getDao_demo() { 51 return dao_demo; 52 } 53 54 @Resource 55 public void setDao_demo(Dao_demoImple dao_demo) { 56 this.dao_demo = dao_demo; 57 } 58 /* 59 * bean初始化方法注解 60 * @PostConstruct 61 */ 62 @PostConstruct 63 public void init() { 64 System.out.println("init()>>>>>>"); 65 } 66 67 /* 68 * bean銷毀注解 69 * @PreDestroy 70 */ 71 @PreDestroy 72 public void destroy() { 73 System.out.println("destroy()>>>>>"); 74 } 75 76 }

Person接口

1 package com.xiaostudy.service; 2 3 public interface Person { 4 5 }

Dao_demo接口

1 package com.xiaostudy.dao; 2 3 public interface Dao_demo { 4 5 }

Dao_demoImple.java

1 package com.xiaostudy.service; 2 3 import org.springframework.beans.factory.annotation.Value; 4 import org.springframework.stereotype.Component; 5 6 import com.xiaostudy.dao.Dao_demo; 7 @Component("dao_demo") 8 public class Dao_demoImple implements Dao_demo { 9 10 private String name; 11 12 public String getName() { 13 return name; 14 } 15 16 @Value("demo") 17 public void setName(String name) { 18 this.name = name; 19 } 20 21 public void add() { 22 System.out.println("add>>>>>>"); 23 } 24 25 }

測試類Test.java

1 package com.xiaostudy.service; 2 3 import org.springframework.context.ApplicationContext; 4 import org.springframework.context.support.AbstractApplicationContext; 5 import org.springframework.context.support.ClassPathXmlApplicationContext; 6 7 import com.xiaostudy.dao.Dao_demo; 8 import com.xiaostudy.service.Person; 9 10 public class Test { 11 12 public static void main(String[] args) { 13 ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); 14 Person person = ac.getBean("person", Person.class); 15 System.out.println(person); 16 PersonImple pi = (PersonImple)person; 17 System.out.println(pi.getName()); 18 Dao_demoImple dao_demo = pi.getDao_demo(); 19 System.out.println(dao_demo); 20 dao_demo.add(); 21 System.out.println(dao_demo.getName()); 22 /*Person person1 = ac.getBean("person", Person.class); 23 Person person2 = ac.getBean("person", Person.class); 24 System.out.println(person1); 25 System.out.println(person2); 26 ((AbstractApplicationContext) ac).close();*/ 27 } 28 29 }

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轉載于:https://www.cnblogs.com/xiaostudy/p/9534697.html

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