spring的三种注入方式：spring的三种注入方式：??autowire“byName” ?autowirebytype 例如：有如下两个类
spring的三种注入方式：
spring的三种注入方式：
?
?autowire=“byName” ?autowire="bytype"
例如：有如下两个类需要注入
<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>-->?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：
<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>--><?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"?class="org.jia.OrderItem">
????????<property?name="orderdec"?value="item00001"></property>
????</bean>
????<bean?id="order"?class="org.jia.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
<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>--><?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"?class="org.jia.OrderItem">
????????<property?name="orderdec"?value="item00001"></property>
????</bean>
????<bean?id="order"?class="org.jia.Order"?autowire="byName">
????????<property?name="orderNum"?value="order000007"></property>
????</bean>
</beans>
getter&&setter方式第三种注入：byType
<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>--><?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"?class="org.jia.OrderItem">
????????<property?name="orderdec"?value="item00001"></property>
????</bean>
????<bean?id="order"?class="org.jia.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; }
<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>--><?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"?class="org.jia.OrderItem">
????????<property?name="orderdec"?value="item00001"></property>
????</bean>
????<bean?id="order"?class="org.jia.Order"?autowire="constructor">
????????<property?name="orderNum"?value="order000007"></property>
????</bean>
</beans>
?
