基于set方式的依赖注入
基于set方式的依赖注入概述
依赖注入的方式分为基于构造器的注入方式和基于set的注入方式，而基于set方式的依赖注入是是依赖注入的核心，本文详细讲解多种类型的数据注入的方式，包括普通注入，bean注入，array|list|map|set|props|null
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实践
地址类，用于测试bean注入
package com.kuangstudy.di;
/**
* 功能描述
*
* @since 2022-06-25
*/
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 + '\'' +
'}';
}
}学生类，用于测试全部类型
package com.kuangstudy.di;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
/**
* 功能描述
*
* @since 2022-06-25
*/
public class Student {
private String name;
private Address address;
private String[] books;
private List<String> hobbies;
private Map<String, String> card;
private Set<String> 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<String> getHobbies() {
return hobbies;
}
public void setHobbies(List<String> hobbies) {
this.hobbies = hobbies;
}
public Map<String, String> getCard() {
return card;
}
public void setCard(Map<String, String> card) {
this.card = card;
}
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;
}
public Set<String> getGames() {
return games;
}
public void setGames(Set<String> games) {
this.games = games;
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", address=" + address +
", books=" + Arrays.toString(books) +
", hobbies=" + hobbies +
", card=" + card +
", games=" + games +
", wife='" + wife + '\'' +
", info=" + info +
'}';
}
}测试类，用于执行main函数测试
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.kuangstudy.di.Student;
/**
* 功能描述
*
* @since 2022-06-25
*/
public class Test01 {
public static void main(String[] args) {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
Student s1 = (Student) applicationContext.getBean("s1");
System.out.println(s1);
}
}<?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
https://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="address1" >
<property name="address" value="xi'an"></property>
</bean>
<bean id="s1" >
<property name="name" value="xiaoming"></property>
<property name="address" ref="address1"></property>
<property name="books">
<array>
<value>西游记</value>
<value>红楼梦</value>
<value>三国演义</value>
<value>水浒传</value>
</array>
</property>
<property name="hobbies">
<list>
<value>swimming</value>
<value>painting</value>
<value>playing basketball</value>
</list>
</property>
<property name="card">
<map>
<entry key="Student card" value="000010"></entry>
<entry key="Id card" value="xxxxxxxxxxxx"></entry>
<entry key="Bank card" value="xxxxxxxxxxxxxxxx"></entry>
</map>
</property>
<property name="games">
<set>
<value>LOL</value>
<value>COC</value>
<value>BOB</value>
</set>
</property>
<property name="wife">
<null></null>
</property>
<property name="info">
<props>
<prop key="username">root</prop>
<prop key="password">123</prop>
</props>
</property>
</bean>
</beans>
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