1.set注入（更灵活）
<?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:tx="http://www.springframework.org/schema/tx"
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/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置JavaBean -->
<bean id="Stu" class="com.hp.pojo.Student" >
<!-- set注入 -->
<property name="name" value="mm" />
<property name="pwd" value="123" />
</bean>
</beans>
2.构造器注入（实体类要有带参的构造器）
<?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:tx="http://www.springframework.org/schema/tx"
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/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置JavaBean -->
<bean id="Stu" class="com.hp.pojo.Student2" >
<!-- 构造器注入 -->
<!-- index构造方法参数的索引下标，从0开始 -->
<constructor-arg index="0" value="1"></constructor-arg>
<constructor-arg index="1" value="ww"></constructor-arg>
<constructor-arg index="2" value="123"></constructor-arg>
</bean>
</beans>