spring的常用配置

bean.xml

<?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">

    <!-- ###############对象创建############### -->
    <!-- 1. 默认无参数构造器 -->
    <bean id="随意名称" class="包名.类名"></bean>
    <!-- 2. 带参数构造器 -->
    <bean id="随意名称" class="包名.类名">
        <constructor-arg index="索引" type="类型" value="值"></constructor-arg>
        <constructor-arg index="1" type="java.lang.String" value="Jack"></constructor-arg>
    </bean>
    <!-- 定义一个字符串，值是"Jack" ;  String s = new String("jack")-->
    <bean id="引用名称" class="java.lang.String">
        <constructor-arg value="Jacks"></constructor-arg>
    </bean>
    <bean id="随意名称" class="c包名.类名">
        <constructor-arg index="0" type="int" value="100"></constructor-arg>
        <constructor-arg index="1" type="java.lang.String" ref="引用名称"></constructor-arg>
    </bean>
    <!-- 3. 工厂类创建对象 -->
        <!-- # 3.1 工厂类，实例方法 -->
        <!-- 先创建工厂 -->
        <bean id="工厂" class="包名.工厂类名"></bean>
        <!-- 在创建user对象，用factory方的实例方法 -->
        <bean id="随意名称" factory-bean="工厂" factory-method="工厂类里的方法名"></bean>
        <!-- # 3.2 工厂类： 静态方法 -->
        <bean id="随意名称" class="包名.工厂类名" factory-method="工厂类里的方法名（静态方法）"></bean>
    <!-- 对象写法 -->

    <!-- ###############对象属性赋值############### -->
    <!--  1) 通过构造函数 -->
    <bean id="随意名称" class="包名.类名">
        <constructor-arg index="索引" type="类型" value="值"></constructor-arg>
        <constructor-arg index="1" type="java.lang.String" value="Jack"></constructor-arg>
    </bean>

    <!-- 2) 通过set方法给属性注入值 -->
    <bean id="随意名称" class="c包名.类名" scope="prototype">
        <!-- 类里面要写好set方法 -->
        <property name="id" value="101"></property>
        <property name="name" value="Jack"></property>
    </bean>
    <!-- 3) 通过p名称空间注入值 -->
    <bean id="user" class="cn.itcast.c_property.User" p:name="Jack0001"></bean>

    <!-- ###############小案例############### -->
    <!-- 1.ref引用创建类 -->
        <!-- dao instance -->
        <bean id="userDao" class="包名.UserDao"></bean>
        <!-- service instance -->
        <bean id="userService" class="包名.UserService">
            <property name="userDao" ref="userDao"></property>
        </bean>
        <!-- action instance -->
        <bean id="userAction1" class="包名.UserAction">
            <property name="userService" ref="userService"></property>
        </bean>
    <!-- 2.内部bean创建类 -->
        <bean id="userAction2" class="包名.UserAction">
            <property name="userService">
                <bean class="包名.UserService">
                    <property name="userDao">
                        <bean class="包名.UserDao"></bean>
                    </property>
                </bean>
            </property>
        </bean>
    <!-- 3.p 名称空间创建类 -->
         <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>
</beans>