除了在Bean定义文件中直接指定字符串值,使用<ref>直接指定参考至其他的Bean,或是使用<bean>标签并指定"class"属性来指定依赖对象之外,spring也支持隐式的自动绑定,您可以透过类型(byType)或名称(byName)将某个Bean实例绑定至其他Bean对应的属性,比如
<bean id="helloBean" class="....." autowire="byType">
...
</bean>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
<bean id="triangle" name="triangle-name" class="zxl.Triangle" autowire="byName" >
</bean>
<bean id="pointA" class="zxl.Point" >
<property name="x" value="0" />
<property name="y" value="0" />
</bean>
<bean id="pointB" class="zxl.Point" >
<property name="x" value="-20" />
<property name="y" value="0" />
</bean>
<bean id="pointC" class="zxl.Point" >
<property name="x" value="20" />
<property name="y" value="0" />
</bean>
</beans>
package zxl;
import java.util.List;
public class Triangle {
private Point pointA;
private Point pointB;
private Point pointC;
public Point getPointA() {
return pointA;
}
public void setPointA(Point pointA) {
this.pointA = pointA;
}
public Point getPointB() {
return pointB;
}
public void setPointB(Point pointB) {
this.pointB = pointB;
}
public Point getPointC() {
return pointC;
}
public void setPointC(Point pointC) {
this.pointC = pointC;
}
public void draw(){
System.out.println("point A ("+getPointA().getX()+","+getPointA().getY()+")");
System.out.println("point B ("+getPointB().getX()+","+getPointB().getY()+")");
System.out.println("point C ("+getPointC().getX()+","+getPointC().getY()+")");
}
}
package zxl;
public class Point {
private int x;
private int y;
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
}
package zxl;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class DrawingApp {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");
Triangle triangle =(Triangle) context.getBean("triangle");
triangle.draw();
}
}