|
| |
| 28. 9. 1. 基于XML的组件配置：构造器注入 |
|
|
File: context.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"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd">
<bean id="encyclopedia"
name="knowitall"
class="ConfigurableEncyclopedia">
<constructor-arg>
<util:map>
<entry key="AgeOfUniverse" value="13700000000"/>
<entry key="ConstantOfLife" value="326190476"/>
</util:map>
</constructor-arg>
</bean>
<bean id="oracle" class="BookwormOracle">
<property name="encyclopedia" ref="knowitall"/>
</bean>
</beans>
|
|
File: Main.java |
|
import java.util.Map;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.util.Assert;
public class Main {
public static void main(String[] a) {
XmlBeanFactory bf = new XmlBeanFactory(new ClassPathResource("context.xml"));
Oracle oracle = (Oracle) bf.getBean("oracle");
System.out.println("Meaning of life is " + oracle.defineMeaningOfLife());
}
}
interface Oracle {
String defineMeaningOfLife();
}
interface Encyclopedia {
Long findLong(String entry);
}
class BookwormOracle implements Oracle {
private Encyclopedia encyclopedia;
public String defineMeaningOfLife() {
Long ageOfUniverse = this.encyclopedia.findLong("AgeOfUniverse");
Long constantOfLife = this.encyclopedia.findLong("ConstantOfLife");
return String.valueOf(ageOfUniverse / constantOfLife);
}
public void setEncyclopedia(Encyclopedia encyclopedia) {
this.encyclopedia = encyclopedia;
}
}
class ConfigurableEncyclopedia implements Encyclopedia {
private Map<String, Long> entries;
public ConfigurableEncyclopedia(Map<String, Long> entries) {
Assert.notNull(entries, "The 'entries' argument cannot be null.");
this.entries = entries;
}
public Long findLong(String entry) {
return this.entries.get(entry);
}
}
|
|
 Download: Spring-XMLBasedBeanConfigurationFillConstructor.zip( 2,601 k) |
|