Bean 的scope
五类范围
| 名称 | 说明 |
|---|---|
| singleton | 将bean定义的范围限定为每个Spring IoC容器的单个实例（默认值）。 |
| prototype | 这个范围将单个bean定义为具有任意数量的对象实例。 |
| request | 这将一个bean定义作用于HTTP请求。只有在web-aware Spring ApplicationContext中才有效。 |
| session | 这个bean定义了一个HTTP会话。只有在web-aware Spring ApplicationContext中才有效。 |
| global-session | 这个bean定义了一个全局HTTP会话。只有在web-aware Spring ApplicationContext中才有效。 |
singleton
App.java
import com.mj.Say;
import com.mj.bean.BeanAnimal;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import java.io.FileNotFoundException;
public class App {
public static void main(String args[]) throws FileNotFoundException{
//ClassPathXmlApplicationContext
ApplicationContext context = new ClassPathXmlApplicationContext("Bean.xml");
Say sa = (Say) context.getBean("Say");
sa.setMsg("__Spring");
sa.talk();
//FileSystemXmlApplicationContext
ApplicationContext fileContext = new FileSystemXmlApplicationContext("/src/Bean.xml");
Say sa1 = (Say) fileContext.getBean("Say");
sa1.setMsg("=Spring====");
sa1.talk();
ApplicationContext animalContext = new ClassPathXmlApplicationContext("Bean.xml");
BeanAnimal ani = (BeanAnimal) animalContext.getBean("Animal");
ani.setAnimalName("dog");
ani.showAnimal();
ApplicationContext aniContext1 = new ClassPathXmlApplicationContext("Bean.xml");
BeanAnimal animal = (BeanAnimal) aniContext1.getBean("Animal");
animal.setAnimalName("pig");
animal.showAnimal();
}
}
BeanAnimal.java
package com.mj.bean;
public class BeanAnimal {
private String animalName = "";
public void setAnimalName(String animalName) {
this.animalName = animalName;
}
public void showAnimal(){
System.out.println("=animal name="+animalName);
}
}
BeanSay.java
package com.mj.bean;
public class BeanSay {
private String msg = "=Spring=";
public void setMsg(String msg) {
this.msg = msg;
}
public String talk(){
System.out.println( msg );
return msg;
}
}
Bean.xml
<?xml version = "1.0" encoding = "UTF-8"?>
<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 = "BeanSay" class = "com.mj.bean.BeanSay">
<property name = "msg" value = "===Spring==="/>
</bean>
<!-- scope 为 单例 -->
<bean id = "Animal" class = "com.mj.bean.BeanAnimal" scope="singleton" >
<property name = "animalName" value = "(_-_)"/>
</bean>
</beans>
运行
/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/bin/java "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=58549:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/lib/tools.jar:/Users/mac/d/project/java/mspr/out/production/mspr:/Users/mac/d/project/java/mspr/lib/spring-instrument-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-instrument-tomcat-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-aspects-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-context-support-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-aop-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-jms-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-expression-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-jdbc-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-oxm-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/commons-logging-1.2.jar:/Users/mac/d/project/java/mspr/lib/spring-messaging-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/aopalliance-1.0.jar:/Users/mac/d/project/java/mspr/lib/spring-tx-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-beans-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-orm-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-context-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-core-4.3.18.RELEASE.jar:/Users/mac/d/project/java/mspr/lib/spring-test-4.3.18.RELEASE.jar App
objc[8940]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/bin/java (0x10c7c04c0) and /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/libinstrument.dylib (0x10e7f54e0). One of the two will be used. Which one is undefined.
Dec 04, 2018 12:38:07 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@67424e82: startup date [Tue Dec 04 12:38:07 CST 2018]; root of context hierarchy
Dec 04, 2018 12:38:07 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [Bean.xml]
Dec 04, 2018 12:38:07 PM org.springframework.context.support.FileSystemXmlApplicationContext prepareRefresh
__Spring
信息: Refreshing org.springframework.context.support.FileSystemXmlApplicationContext@3e6fa38a: startup date [Tue Dec 04 12:38:07 CST 2018]; root of context hierarchy
Dec 04, 2018 12:38:07 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from file [/Users/mac/d/project/java/mspr/src/Bean.xml]
Dec 04, 2018 12:38:07 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@754ba872: startup date [Tue Dec 04 12:38:07 CST 2018]; root of context hierarchy
Dec 04, 2018 12:38:07 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [Bean.xml]
=Spring====
Dec 04, 2018 12:38:07 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@6fd02e5: startup date [Tue Dec 04 12:38:07 CST 2018]; root of context hierarchy
Dec 04, 2018 12:38:07 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [Bean.xml]
=animal name=dog
=animal name=pig
Process finished with exit code 0
