Spring注入方式

最新推荐文章于 2025-05-21 21:35:45 发布

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最新推荐文章于 2025-05-21 21:35:45 发布

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本文链接：https://blog.youkuaiyun.com/qq_34273340/article/details/79256818

本文通过实例展示了Spring框架中两种依赖注入方式：构造器注入和Setter注入的具体实现过程，包括Dept类定义、XML配置及测试代码。

一、构造器注入：

（1）创建一个Demp类：

package cn.libin.vo;

public class Dept {
    private Integer deptno;
    private String depname;

    public Dept(Integer deptno, String depname) {
        this.deptno = deptno;
        this.depname = depname;
    }
    @Override
    public String toString() {
        return "Dept{" +
                "deptno=" + deptno +
                ", depname='" + depname + '\'' +
                '}';
    }
}

(2)创建配置文件：

<?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="dept" class="cn.libin.vo.Dept">
               <constructor-arg name="deptno" value="1002"/>
                <constructor-arg name="depname" value="jack"/>
        </bean>
</beans>

（3）编写测试类：

package cn.libin.vo;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestDept {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext(
                "springconfigure.xml");
        Dept dept = context.getBean("deptA", Dept.class);
        System.out.println(dept);
    }
}

二、setter注入：

(1)创建一个Dept类：

package cn.libin.vo;

public class Dept {
    private Integer deptno;
    private String depname;

    public Integer getDeptno() {
        return deptno;
    }

    public void setDeptno(Integer deptno) {
        this.deptno = deptno;
    }

    public String getDepname() {
        return depname;
    }

    public void setDepname(String depname) {
        this.depname = depname;
    }

    @Override
    public String toString() {
        return "Dept{" +
                "deptno=" + deptno +
                ", depname='" + depname + '\'' +
                '}';
    }
}

（2）配置xml文件：

<bean id="deptA" class="cn.libin.vo.Dept">
       <property name="deptno" value="1000"/>
        <property name="depname" value="rose"/>
</bean>

（3）编写测试类：

package cn.libin.vo;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestDept {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext(
                "springconfigure.xml");
        Dept dept = context.getBean("deptA", Dept.class);
        System.out.println(dept);
    }
}