Java Web开发学习Spring构造器和属性注入

Posted 2021-01-16 黑色的小蚂蚁

 

测试类

public class Construct {
    private String address;
    private long phone;
    public Construct(String name, int age) {
        System.out.println("> " + name + ", " + age);
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        System.out.println("> " + address);
        this.address = address;
    }
    public long getPhone() {
        return phone;
    }
    public void setPhone(long phone) {
        System.out.println("> " + phone);
        this.phone = phone;
    }
}

    <!-- 使用name -->
    <bean id="construct_c1" class="cn.ycx.bean.Construct">
        <constructor-arg name="age" value="1" type="int"></constructor-arg>
        <!-- type可以省略 -->
        <constructor-arg name="name" value="Tom_1"></constructor-arg>
        <!-- 属性配置 -->
        <property name="address" value="xi‘an"></property>
        <property name="phone" value="18000"></property>
    </bean>
    <!-- 使用index -->
    <bean id="construct_c2" class="cn.ycx.bean.Construct">
        <constructor-arg index="1" value="2" type="int"></constructor-arg>
        <!-- type可以省略 -->
        <constructor-arg index="0" value="Tom_2"></constructor-arg>
    </bean>
    <!-- 省略name和index，值顺序必须和方法定义保持一致 -->
    <bean id="construct_c3" class="cn.ycx.bean.Construct">
        <constructor-arg value="Tom_3" type="String"></constructor-arg>
        <constructor-arg value="3" type="int"></constructor-arg>
    </bean>
    <!-- c命名空间name -->
    <bean id="construct_c4" class="cn.ycx.bean.Construct" c:name="Tom_4" c:age="4" p:address="beijing" p:phone="136000"></bean>
    <!-- c命名空间index -->
    <bean id="construct_c5" class="cn.ycx.bean.Construct" c:_0="Tom_5" c:_1="5"></bean>