spring之构造注入

第一种：通过构造name和value属性（不常用）

<!-- userAction -->
<bean id="userAction" class="com.xx.action.UserAction">
<constructor-arg name="add" value="山东"></constructor-arg>
<constructor-arg name="age" value="29"></constructor-arg>
</bean>

第二种：构造通过index/value  配合type使用（常用）

<!-- userAction -->
<bean id="userAction" class="com.xx.action.UserAction">
<constructor-arg index="0" value="孔府" type="String"></constructor-arg>
<constructor-arg index="1"  value="29" type="Integer"></constructor-arg>
</bean>

bean类

public class UserAction {

	private String name;
	private Integer age;
	private String add;
	public UserAction(String name, Integer age) {
		this.name = name;
		this.age = age;
	}
	public UserAction(Integer age, String add) {
		this.age = age;
		this.add = add;
	}
}