关于Spring的注入方式

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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" class="org.jia.OrderItem">
        <property name="orderdec" value="item00001"></property>
    </bean>
    <bean id="order" class="org.jia.Order" >
        
        <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>
   
    <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

<?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="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 ){ rderitem = item; }