spring的三種注入方式：
- 接口注入（不推薦）
- getter，setter方式注入（比較常用）
- 構造器注入（死的應用）
關于getter和setter方式的注入：
- autowire="defualt"
- autowire=“byName”
- autowire="bytype"
例如：有如下兩個類需要注入
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方式第一種注入：
<?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" class="org.jia.OrderItem">
<property name="orderdec" value="item00001"></property>
</bean>
<bean id="order" class="org.jia.Order" >
<!-----注入變量 名字必須與類中的名字一樣------->
<property name="orderNum" value="order000007"></property>
<！--注入對象 名字為orderitem，所屬的類的應用id為orderItem-->
<property name="orderitem" ref="orderItem"></property>
--></bean>
</beans>
getter&&setter方式第二種注入： byName
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!--此時的id就必須與Order.java中所定義的OrderItem的對象名稱一樣了，不然就會找不到-->
<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方式第三種注入：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注入則就與id沒有關系，可以隨便定義id ！！！但是不能出現多個此類的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>
關于構造器的注入：
autowire="
constructor"
需要在Order.java中加入一個構造器
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" 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>
posted on 2007-08-29 16:25
jiadong 閱讀(38119)
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