Spring中基于Java的配置@Configuration和@Bean用法 (转)

• Z时代
• 2024-01-10
• 分类：综合

本文内容纲要：Spring中基于Java的配置@Configuration和@Bean用法 (转)

spring中为了减少xml中配置，可以生命一个配置类（例如SpringConfig）来对bean进行配置。

一、首先，需要xml中进行少量的配置来启动Java配置:

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2. <beans xmlns="http://www.springframework.org/schema/beans"
3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
4. xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p"
5. xmlns:context="http://www.springframework.org/schema/context"
6. xsi:schemaLocation="
7. http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
8. http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
9. http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
10. http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">
11. <context:component-scan base-package="SpringStudy.Model">
12. </context:component-scan>

二、定义一个配置类

用@Configuration注解该类，等价 与XML中配置beans；用@Bean标注方法等价于XML中配置bean。

代码如下：

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1. package SpringStudy;
2. import org.springframework.context.annotation.Bean;
3. import org.springframework.context.annotation.Configuration;
4. import SpringStudy.Model.Counter;
5. import SpringStudy.Model.Piano;
7. @Configuration
8. public class SpringConfig {
10. @Bean
11. public Piano piano(){
12. return new Piano();
13. }
14. @Bean(name = "counter")
15. public Counter counter(){
16. return new Counter(12,"Shake it Off",piano());
17. }
18. }

三、基础类代码

Counter：

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1. package SpringStudy.Model;
3. public class Counter {
4. public Counter() {
5. }
7. public Counter(double multiplier, String song,Instrument instrument) {
8. this.multiplier = multiplier;
9. this.song = song;
10. this.instrument=instrument;
11. }
13. private double multiplier;
15. private String song;
17. @Resource
18. private Instrument instrument;
20. public double getMultiplier() {
21. return multiplier;
22. }
24. public void setMultiplier(double multiplier) {
25. this.multiplier = multiplier;
26. }
29. public String getSong() {
30. return song;
31. }
33. public void setSong(String song) {
34. this.song = song;
35. }
37. public Instrument getInstrument() {
38. return instrument;
39. }
41. public void setInstrument(Instrument instrument) {
42. this.instrument = instrument;
43. }
45. }

Piano类

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1. package SpringStudy.Model;
4. public class Piano {
5. private String name="Piano";
6. private String sound;
8. public String getName() {
9. return name;
10. }
12. public void setName(String name) {
13. this.name = name;
14. }
16. public String getSound() {
17. return sound;
18. }
20. public void setSound(String sound) {
21. this.sound = sound;
22. }
24. }

四、调用测试类

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1. package webMyBatis;
3. import org.springframework.context.ApplicationContext;
4. import org.springframework.context.annotation.AnnotationConfigApplicationContext;
5. import SpringStudy.Model.Counter;
7. public class SpringTest {
8. public static void main(String[] args) {
9. //ApplicationContext ctx = new ClassPathXmlApplicationContext("spring/bean.xml");// 读取bean.xml中的内容
10. ApplicationContext annotationContext = new AnnotationConfigApplicationContext("SpringStudy");
11. Counter c = annotationContext.getBean("counter", Counter.class);// 创建bean的引用对象
12. System.out.println(c.getMultiplier());
13. System.out.println(c.isEquals());
14. System.out.println(c.getSong());
15. System.out.println(c.getInstrument().getName());
16. }
17. }

注意：如果是在xml中配置beans和bean的话，或者使用自动扫描调用的话，代码为

ApplicationContext ctx = new ClassPathXmlApplicationContext("spring/bean.xml");// 读取bean.xml中的内容

Counter c = ctx.getBean("counter", Counter.class);// 创建bean的引用对象

五、运行结果

12.0

false

Shake it Off

Piano

本文转自http://blog.csdn.net/vvhesj/article/details/47661001 感谢原作者

本文内容总结：Spring中基于Java的配置@Configuration和@Bean用法 (转)

原文链接：https://www.cnblogs.com/panxuejun/p/6591774.html

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