Spring 构造注入

爱被打了一巴掌 2022-11-07 05:29 137阅读 0赞

### 一、新建类 ###

建一个普通类，定义属性，生成构造方法

User.java

package com.health.bean;
    
    public class User {
        private int uid;
        private String uname;
        private String uphone;
    
        public User() {
        }
        public User(int uid, String uname, String uphone) {
            this.uid = uid;
            this.uname = uname;
            this.uphone = uphone;
        }
    
        public int getUid() {
            return uid;
        }
    
        public void setUid(int uid) {
            this.uid = uid;
        }
    
        public String getUname() {
            return uname;
        }
    
        public void setUname(String uname) {
            this.uname = uname;
        }
    
        public String getUphone() {
            return uphone;
        }
    
        public void setUphone(String uphone) {
            this.uphone = uphone;
        }
    
        @Override
        public String toString() {
            return "User{" +
                    "uid=" + uid +
                    ", uname='" + uname + '\'' +
                    ", uphone='" + uphone + '\'' +
                    '}';
        }
    }

## ##

### 二、编写配置文件 ###

在配置文件中配置对象创建并进行构造注入

applicationContext.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="user1" class="com.health.bean.User">
            <constructor-arg name="uid" value="23"/>
            <constructor-arg name="uname" value="哈哈"/>
            <constructor-arg name="uphone" value="142"/>
        </bean>
    
        
        <bean id="user2" class="com.health.bean.User">
            <constructor-arg index="0" value="25"/>
            <constructor-arg index="1" value="嘿嘿"/>
            <constructor-arg index="2" value="122"/>
        </bean>
    
    </beans>

### 三、测试 ###

UserTest.java

public class UserTest {
        @Test
        public void test(){
            ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
            User user1 = ac.getBean("user1", User.class);
            User user2 = ac.getBean("user2", User.class);
            System.out.println("user1:"+user1);
            System.out.println("user2:"+user2);
        }
    }