spring 注入方式 转载http://www.blogjava.net/jiadong/archive/2007/08/29/140962.html
关于Spring的注入方式
spring的三种注入方式：
接口注入（不推荐）
getter，setter方式注入（比较常用）
构造器注入（死的应用）
关于getter和setter方式的注入：
autowire="defualt"
autowire=“byName”
autowire="bytype"
例如：有如下两个类需要注入
1 package org.jia;
2
3 public class Order {
4 private String orderNum;
5 @SuppressWarnings("unused")
6 private OrderItem orderitem;
7
8 public OrderItem getOrderitem() {
9 return orderitem;
10 }
11
12 public void setOrderitem(OrderItem orderitem) {
13 this.orderitem = orderitem;
14 }
15
16 public String getOrderNum() {
17 return orderNum;
18 }
19
20 public void setOrderNum(String orderNum) {
21 this.orderNum = orderNum;
22 }
23
24 }
25 package org.jia;
26
27 public class OrderItem {
28 private String orderdec;
29
30 public String getOrderdec() {
31 return orderdec;
32 }
33
34 public void setOrderdec(String orderdec) {
35 this.orderdec = orderdec;
36 }
37 }
38
getter&&setter方式第一种注入：
<?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="orderItem" value="item00001"></property>
</bean>
<bean id="order" >
<!-----注入变量 名字必须与类中的名字一样------->
<property name="orderNum" value="order000007"></property>
<！--注入对象 名字为orderitem，所属的类的应用id为orderItem-->
<property name="orderitem" ref="orderItem"></property>
--></bean>
</beans>
getter&&setter方式第二种注入： byName
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!--此时的id就必须与Order.java中所定义的OrderItem的对象名称一样了，不然就会找不到-->
<bean id="orderitem" value="item00001"></property>
</bean>
<bean id="order" autowire="byName">
<property name="orderNum" value="order000007"></property>
</bean>
</beans>
getter&&setter方式第三种注入：byType
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!--按照byType注入则就与id没有关系，可以随便定义id ！！！但是不能出现多个此类的id-->
<bean id="orderitdfadafaem" value="item00001"></property>
</bean>
<bean id="order" autowire="byType">
<property name="orderNum" value="order000007"></property>
</bean>
</beans>
关于构造器的注入：
autowire="constructor"
需要在Order.java中加入一个构造器
public Order(OrderItem item ){ orderitem = item; }
<?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="orderItem" value="item00001"></property>
</bean>
<bean id="order" autowire="constructor">
<property name="orderNum" value="order000007"></property>
</bean>
</beans>
