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setter方法注入（Java EE 学习笔记07）

article 2025/2/22 2:03:02

属性setter方法注入是Spring最主流的注入方法，这种注入方法简单、直观，它是在被注入的类中声明一个setter方法，通过setter方法的参数注入对应的值。

案例：

① 创建User2实体，配置setter方法

package com.lq.entities;

/**
 * @Author: Luqing Teacher
 * @CreateTime: 2024-11-27
 * @Description: 用户2
 * @Version: 1.0
 */


public class User2 {
    private int id;
    private String name;
    private String pwd;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Override
    public String toString() {
        return "User2{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pwd='" + pwd + '\'' +
                '}';
    }
}

② 创建applicationContext-user2.xml

<?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="user2" class="com.lq.entities.User2">
        <property name="id" value="2"></property>
        <property name="name" value="lq2"></property>
        <property name="pwd" value="456"></property>

    </bean>

</beans>

③ 测试类

package com.lq.test;

import com.lq.entities.User2;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @Author: Luqing Teacher
 * @CreateTime: 2024-11-27
 * @Description: 测试2
 * @Version: 1.0
 */


public class TestUser2 {
    public static void main(String[] args)
    {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext-user2.xml");
        User2 user2 = applicationContext.getBean("user2", User2.class);
        System.out.println(user2);
    }
}