Spring IOC 容器 如何使用构造方法问属性赋值

1. 引入maven依赖
2. 准备 JavaBean
3. 编写Spring配置文件
4. 编写测试类

	org.springframework
	spring-context
	5.3.22

package com.lihaozhe.ioc.dto;

import java.io.Serializable;


public class User implements Serializable {
    private static final long serialVersionUID = 740885412941761394L;
    private long id;
    private String nickname;
    private int gender;

    public User() {
        System.out.println("无参构造");
    }

    public User(long id, String nickname) {
        this.id = id;
        this.nickname = nickname;
        System.out.println("id nickname 有参构造");
    }

    public User(long id, String nickname, int gender) {
        this.id = id;
        this.nickname = nickname;
        this.gender = gender;
        System.out.println("id nickname gender 有参构造");
    }

    public long getId() {
        return id;
    }

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

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public int getGender() {
        return gender;
    }

    public void setGender(int gender) {
        this.gender = gender;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", nickname='" + nickname + ''' +
                ", gender=" + gender +
                '}';
    }
}

src/main/resouces/ioc/bean.xml

package com.lihaozhe.ioc;

import com.lihaozhe.ioc.dto.User;
import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class IocTest {
    @Test
    public void test01(){
        // 获取 IOC 容器
        ApplicationContext context = new ClassPathXmlApplicationContext("ioc/bean.xml");
        // 从 IOC 容器中获取 JavaBean对象
        User user01 = (User) context.getBean("user01");
        User user02 = (User) context.getBean("user02");
        System.out.println(user02);
        System.out.println(user01 == user02);
    }

    @Test
    public void test02(){
        // 获取 IOC 容器
        ApplicationContext context = new ClassPathXmlApplicationContext("ioc/bean.xml");
        // 从 IOC 容器中获取 JavaBean对象
        User user = (User) context.getBean("user03");
        System.out.println(user);
    }
    @Test
    public void test03(){
        // 获取 IOC 容器
        ApplicationContext context = new ClassPathXmlApplicationContext("ioc/bean.xml");
        // 从 IOC 容器中获取 JavaBean对象
        User user = (User) context.getBean("user04");
        System.out.println(user);
    }
}