DI依赖注入

• 依赖：bean对象的创建依赖于容器
• 注入：bean对象中所有属性由容器来注入

DI注入的几种方式：

• 构造器注入-详见：

• set方式注入（重点）

• 其他拓展方式注入

  可以利用p命名空间和c命名空间进行注入
  

set方式注入

Address.java:

package com.kakafa.pojo;

public class Address {
    private String address;

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "Address{" +
                "address='" + address + '\'' +
                '}';
    }
}

Student.java:

package com.kakafa.pojo;

import java.util.*;

public class Student {
    private String name;
    private Address address;
    private String[] books;
    private List hobbies;
    private Map card;
    private Set games;
    private String wife;
    private Properties info;

    public String getName() {
        return name;
    }

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

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    public String[] getBooks() {
        return books;
    }

    public void setBooks(String[] books) {
        this.books = books;
    }

    public List getHobbies() {
        return hobbies;
    }

    public void setHobbies(List hobbies) {
        this.hobbies = hobbies;
    }

    public Map getCard() {
        return card;
    }

    public void setCard(Map card) {
        this.card = card;
    }

    public Set getGames() {
        return games;
    }

    public void setGames(Set games) {
        this.games = games;
    }

    public String getWife() {
        return wife;
    }

    public void setWife(String wife) {
        this.wife = wife;
    }

    public Properties getInfo() {
        return info;
    }

    public void setInfo(Properties info) {
        this.info = info;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", address=" + address.toString() +
                ", books=" + Arrays.toString(books) +
                ", hobbies=" + hobbies +
                ", card=" + card +
                ", games=" + games +
                ", wife='" + wife + '\'' +
                ", info=" + info +
                '}';
    }
}

bean.xml:

<?xml version="1.0" encoding="UTF-8"?>



    
        
    

    
        
        
        
        
        
        
            
                红楼梦
                水浒传
                三国演绎
                西游记
            
        
        
        
            
                看书
                打乒乓球
                游泳
                听歌
            
        
        
        
            
        
        
        
            
                王者荣耀
                英雄联盟
                使命召唤
            
        
        
        
            
        
        

        
        
            
                大一
                一班
            
        

    

test:

import com.kakafa.pojo.Student;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {

    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
        Student student = (Student)context.getBean("student");
        System.out.println(student.toString());

        /*
        * Student{
        * name='许魏洲',
        * address=Address{address='地球村2662号'},
        * books=[红楼梦, 水浒传, 三国演绎, 西游记],
        * hobbies=[看书, 打乒乓球, 游泳, 听歌],
        * card={学号=202201064455, 学院=音乐学院},
        * games=[王者荣耀, 英雄联盟, 使命召唤],
        * wife='null',
        * info={班级=一班, 年级=大一}}
         * */

    }
}