DI依赖注入-P8，P9，P10，P11

1.构造器注入

之前写过了~~~~

2.Set方式注入【重点】

3.拓展方式注入

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2.Set方式注入【重点】 

【环境搭建】

1.复杂类型

2.真实测试对象

四个文件

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Student实体类的创建：

 主要是依据官方文档来建立。那个Address也是为了测试不同的类型，而创建的引入类。主体是这个Student！！！

package com.Li.pojo;
 
import java.util.*;
 
//搭建多种注入方式，所以需要多种参数类型
public class Student {
    private String name;
    private Address address;
    private String[] books;
    private List hobbys;
    private Map card;
    private Set games;
    private Properties info;
    private String wife;
 
    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 getHobbys() {
        return hobbys;
    }
 
    public void setHobbys(List hobbys) {
        this.hobbys = hobbys;
    }
 
    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 Properties getInfo() {
        return info;
    }
 
    public void setInfo(Properties info) {
        this.info = info;
    }
 
    public String getWife() {
        return wife;
    }
 
    public void setWife(String wife) {
        this.wife = wife;
    }
 
    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", address=" + address +
                ", books=" + Arrays.toString(books) +
                ", hobbys=" + hobbys +
                ", card=" + card +
                ", games=" + games +
                ", info=" + info +
                ", wife='" + wife + '\'' +
                '}';
    }
}

Address实体类的创建：

package com.Li.pojo;
 
public class Address {
    private String address;
 
    public String getAddress() {
        return address;
    }
 
    public void setAddress(String address) {
        this.address = address;
    }
}

beans.xml(最基础的)

"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
        https://www.springframework.org/schema/beans/spring-beans.xsd">
 
  
  <bean id="student" class="com.Li.pojo.Student">
      <property name="name" value="李"/>
  bean>
 
 
beans>

MyTest

import com.Li.pojo.Student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
public class MyTest {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        Student student = (Student) context.getBean("student");
        System.out.println(student.getName());
 
    }
}

这些配置都没什么好说的，之前都配置过，学过。
测试

 输出配置注入的名字

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八种注入方式：

"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
        https://www.springframework.org/schema/beans/spring-beans.xsd">
 
    
    <bean id="address" class="com.Li.pojo.Address"/>
 
    
    <bean id="student" class="com.Li.pojo.Student">
 
        
        <property name="name" value="李"/>
 
        
        <property name="address" ref="address"/>
 
        
        <property name="books">
            <array>
                <value>红楼梦value>
                <value>水浒传value>
                <value>三国演义value>
                <value>西游记value>
            array>
        property>
 
        
        <property name="hobbys">
            <list>
                <value>听歌value>
                <value>敲代码value>
                <value>打球value>
            list>
        property>
 
        
        <property name="card">
            <map>
                <entry key="身份证" value="0000000"/>
                <entry key="银行卡" value="1111111"/>
            map>
        property>
 
        
        <property name="games">
            <set>
                <value>LOLvalue>
                <value>COCvalue>
                <value>BOBvalue>
            set>
        property>
 
        
        <property name="wife">
            <null>null>
        property>
 
        
        <property name="info">
            <props>
                <prop key="driver">20220000prop>
                <prop key="url">xxxprop>
                <prop key="password">1111prop>
                <prop key="username">rootprop>
            props>
        property>
    bean>
 
 
 
beans>

测试一下。

发现address有问题，所以给Address类里面增加一个toString方法

测试修改之后：

 成功！（因为再bean里面没有设置adress的值，所以为null）

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拓展方式注入（了解即可）

User实体类：

package com.Li.pojo;
 
public class User {
    public String name;
    public int age;
 
    public User() {
    }
 
    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }
 
    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public int getAge() {
        return age;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
}

userBeans.xml：

导入xml约束：

       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:c="http://www.springframework.org/schema/c"

测试p与c （p对应无参构造，c对应有参构造）

 

 测试：

   @Test
    public void test2(){
        ApplicationContext context = new ClassPathXmlApplicationContext("userBeans.xml");
 
        User user = context.getBean("user",User.class);//和强转本质一样，只不过换了一种形式
        System.out.println(user);
 
        User user2 = context.getBean("user2",User.class);
        System.out.println(user2);
    }

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Bean的作用域

 六种作用域：

 默认单例：singleton（每一次创建的都是一个相同的bean对象）

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prototype：（原型模式，每一次都是不同的bean对象）

 

 测试之后不相等了。