Spring中，如何给对象的属性赋值?

         1) 通过构造函数

         2) 通过set方法给属性注入值

         3) p名称空间

         4)自动装配(了解)

         5)注解

    下面是bean.xml文件中的关键代码

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- ###############对象属性赋值############### --> <!-- 1) 通过构造函数 --> <bean id="user1" class="cn.itcast.c_property.User" scope="prototype"> <constructor-arg value="100"></constructor-arg> <constructor-arg value="Tom"></constructor-arg> </bean> <!-- 2) 通过set方法给属性注入值 --> <bean id="user" class="cn.itcast.c_property.User" scope="prototype"> <property name="id" value="101"></property> <property name="name" value="jack1"></property> </bean> <!-- 案例： action/service/dao --> <!-- dao instance --> <bean id="userDao" class="cn.itcast.c_property.UserDao"></bean> <!-- service instance --> <bean id="userService" class="cn.itcast.c_property.UserService"> <property name="userDao" ref="userDao"></property> </bean> <!-- action instance --> <bean id="userAction1" class="cn.itcast.c_property.UserAction"> <property name="userService" ref="userService"></property> </bean> <!-- ##############内部bean############## --> <bean id="userAction2" class="cn.itcast.c_property.UserAction"> <property name="userService"> <bean class="cn.itcast.c_property.UserService"> <property name="userDao"> <bean class="cn.itcast.c_property.UserDao"></bean> </property> </bean> </property> </bean> <!-- 给对象属性注入值： # p 名称空间给对象的属性注入值 (spring3.0以上版本才支持) --> </beans>

p 名称空间注入属性值 (优化)

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- ###############对象属性赋值############### --> <!-- 给对象属性注入值： # p 名称空间给对象的属性注入值 (spring3.0以上版本才支持) --> <bean id="userDao" class="cn.itcast.c_property.UserDao"></bean> <bean id="userService" class="cn.itcast.c_property.UserService" p:userDao-ref="userDao"></bean> <bean id="userAction" class="cn.itcast.c_property.UserAction" p:userService-ref="userService"></bean> <!-- 传统的注入： <bean id="user" class="cn.itcast.c_property.User" > <property name="name" value="xxx"></property> </bean> --> <!-- p名称空间优化后 --> <bean id="user" class="cn.itcast.c_property.User" p:name="Jack0001"></bean> </beans>