Spring配置文件中的abstract属性

最新推荐文章于 2024-07-11 08:34:25 发布

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最新推荐文章于 2024-07-11 08:34:25 发布

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分类专栏： spring 文章标签： xml

本文链接：https://blog.youkuaiyun.com/ApolloNing/article/details/110259567

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本文探讨了Spring配置文件中的`abstract`属性，通过一个学生类和员工类的例子，展示了如何利用`abstract`创建一个父配置，作为共享字段的模板。测试运行结果显示，该配置有效地应用于子类实例，实现了数据的复用。

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abstract的应用是怎么回事呢？
比如，有个学生类和员工类，都有名字和年龄字段

public class Employee {
    private String name;
    private Integer age;
    private String compony;

    public Employee() {
    }

    public Employee(String name, Integer age, String compony) {
        this.name = name;
        this.age = age;
        this.compony = compony;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getCompony() {
        return compony;
    }

    public void setCompony(String compony) {
        this.compony = compony;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", compony='" + compony + '\'' +
                '}';
    }
}

public class Student {
    private String name;
    private Integer age;
    private String school;

    public Student(String name, Integer age, String school) {
        this.name = name;
        this.age = age;
        this.school = school;
    }

    public Student() {
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getSchool() {
        return school;
    }

    public void setSchool(String school) {
        this.school = school;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", school='" + school + '\'' +
                '}';
    }
}

我们可以抽取相同的字段，做成一个父配置，就叫模板吧更形象

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="template" abstract="true">
        <property name="name" value="Apollo"/>
        <property name="age" value="20"/>
    </bean>

    <bean id="student" class="fun.gosuncn.spring01.Student" parent="template">
        <property name="school" value="北京大学"/>
    </bean>

    <bean id="employee" class="fun.gosuncn.spring01.Employee" parent="template">
        <property name="compony" value="小米科技有限公司"/>
    </bean>

</beans>

测试运行

public class TestMain {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring01.xml");
        Object student = applicationContext.getBean("student");
        System.out.println("student = " + student);
        Object employee = applicationContext.getBean("employee");
        System.out.println("employee = " + employee);
    }
}