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| 28. 9. 4. 构造函数参数和本地参数 |
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File: context.xml |
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="RangeService" class="RangeServiceImpl">
<constructor-arg>
<ref local="RangeDao"/>
</constructor-arg>
</bean>
<bean id="RangeDao" class="StaticDataRangeDaoImpl">
</bean>
</beans>
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File: Main.java |
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import java.util.Date;
import java.util.GregorianCalendar;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
class Main {
public static void main(String args[]) throws Exception {
ApplicationContext ctx = new ClassPathXmlApplicationContext("context.xml");
RangeService ws = (RangeService) ctx.getBean("RangeService");
Double high = ws.getHistoricalHigh(new GregorianCalendar(2004, 0, 1).getTime());
System.out.println("High was: " + high);
}
}
interface RangeService {
Double getHistoricalHigh(Date date);
}
class RangeServiceImpl implements RangeService {
RangeDao RangeDao;
public RangeServiceImpl(RangeDao RangeDao) {
this.RangeDao = RangeDao;
}
public Double getHistoricalHigh(Date date) {
RangeData wd = RangeDao.find(date);
if (wd != null)
return new Double(wd.getHigh());
return null;
}
}
class RangeData {
Date date;
double low;
double high;
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
public double getLow() {
return low;
}
public void setLow(double low) {
this.low = low;
}
public double getHigh() {
return high;
}
public void setHigh(double high) {
this.high = high;
}
}
interface RangeDao {
RangeData find(Date date);
RangeData save(Date date);
RangeData update(Date date);
}
class StaticDataRangeDaoImpl implements RangeDao {
public RangeData find(Date date) {
RangeData wd = new RangeData();
wd.setDate((Date) date.clone());
wd.setLow(5);
wd.setHigh(15);
return wd;
}
public RangeData save(Date date) {
return null;
}
public RangeData update(Date date) {
return null;
}
}
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 Download: Spring-ConstructorArgumentAndLocalReference.zip( 2,896 k) |
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