Spring中xml配置的示例分析-创新互联
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成都创新互联公司,专注为中小企业提供官网建设、营销型网站制作、响应式网站设计、展示型做网站、成都网站制作等服务,帮助中小企业通过网站体现价值、有效益。帮助企业快速建站、解决网站建设与网站营销推广问题。1、一个Performer接口:
package springAction;
public interface Performer {
void perform();
}
2、一个Juggler类实现了Performer接口:
package springAction;
public class Juggler implements Performer{
private int beanBags = 3;
public Juggler(){
}
public Juggler(int beanBags){
this.beanBags = beanBags;
}
public void perform(){
System.out.println("Juggling " + beanBags + " beanbags");
}
}
3、一个 PoeticJuggler类继承了Juggler类:
package springAction;
public class PoeticJuggler extends Juggler {
private Poem poem;
public PoeticJuggler(Poem poem){
super();
this.poem = poem;
}
public PoeticJuggler(int beanBags, Poem poem){
super(beanBags);
this.poem = poem;
}
public void perform(){
super.perform();
System.out.println("PoeticJugger reciting...");
poem.recite();
}
}
4、一个Poem接口:
package springAction;
public interface Poem {
void recite();
}
5、一个单例类Stage:
package springAction;
public class Stage {
private Stage(){
}
private static class StageSingletonHolder{
static Stage instance = new Stage();
}
public static Stage getInstance(){
return StageSingletonHolder.instance;
}
}
6、看看xml文件怎么写(springAction.xml):
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-4.1.xsd">
加个main函数运行一下,看看效果:
package springAction;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class springActionMain {
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext ctx = new ClassPathXmlApplicationContext(
"springAction/springAction.xml");
try{
Performer performer = (Performer)ctx.getBean("duke");
performer.perform();
performer = (Performer)ctx.getBean("poeticDuke");
performer.perform();
}catch(Exception e){
e.printStackTrace();
}finally{
((ClassPathXmlApplicationContext)ctx).close();
}
}
}
7、bean的作用域
所有的Spring Bean默认是单例,当容器分配一个Bean时,它总是返回同一个实例。但,spring是灵活的,不需要单例模式时,可以如下配置:
8、初始化Bean和销毁Bean
当Spring容器实例化一个Bean时可能需要做一些初始化的工作,当Spring销毁一个Bean时,可能需要做一些清理工作。Spring支持Bean提供自定义的方法来做初始化工作和销毁工作。
9、为Bean注入属性
一般地,java Bean会有一些私有属性,并有一些set和get方法。Spring可以利用set方法为bean的私有属性注入值。
例子:
package springAction;
public class Instrumentalist implements Performer{
private String song;
private Instrument instrument;
private int age;
public Instrumentalist(){
}
public void perform(){
System.out.println("age = " + age);
System.out.println("Playing "+song);
instrument.play();
}
public String getSong() {
return song;
}
public void setSong(String song) {
this.song = song;
}
public Instrument getInstrument() {
return instrument;
}
public void setInstrument(Instrument instrument) {
this.instrument = instrument;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
xml文件配置:
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