[Java知识库]Spring的注入方式总结

Spring的注入方式总结

Spring的注入方式总结**

最近学习Spring，因官网基本是英文，难以理解，故总结Spring的注入方式，以便后续查找引用。

准备工作

两个类，分别是地址和学生

package com.DI.setGet;

public class Address {
    private String address;

    public String getAddress() {
        return address;
    }

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

package com.DI.setGet;



import java.util.*;

public class student {
    private String name;

    private Address address1;

    private String[] books;

    public List<String> getHobby() {
        return hobby;
    }

    public void setHobby(List<String> hobby) {
        this.hobby = hobby;
    }

    private List<String> hobby;

    private Map<String,String> card;


    private Set<String> games;

    private Properties dedsc;

    private String wife;

    public String getName() {
        return name;
    }

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

    public Address getAddress1() {
        return address1;
    }

    public void setAddress(Address address1) {
        this.address1 = address1;
    }

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

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


    public Map<String, String> getCard() {
        return card;
    }

    public void setCard(Map<String, String> card) {
        this.card = card;
    }

    public Set<String> getGames() {
        return games;
    }

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

    public Properties getDedsc() {
        return dedsc;
    }

    public void setDedsc(Properties dedsc) {
        this.dedsc = dedsc;
    }

    public String getWife() {
        return wife;
    }

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

    @Override
    public String toString() {
        return "student{" +
                "name='" + name + '\'' +
                ", address1=" + address1 +
                ", books=" + Arrays.toString(books) +
                ", hobby=" + hobby +
                ", card=" + card +
                ", games=" + games +
                ", dedsc=" + dedsc +
                ", wife='" + wife + '\'' +
                '}';
    }
}

Xml文件准备

<?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">
</beans>

注入方式

1、name-value 注入

<bean id="student_name" class="com.DI.setGet.student" >
        <property name="name" value="XXX"></property>
    </bean>

2、bean注入

<bean id="address" class="com.DI.setGet.Address">
        <property name="address" value="北京市东城区1号"></property>
    </bean>

    <bean id="student_address" class="com.DI.setGet.student">
        <property name="address1" ref="address"></property>
    </bean>

3、数组注入

<bean id="student_books" class="com.DI.setGet.student">
        <property name="books">
            <array>
                <value>"《泰坦尼克号》"</value>
                <value>"《论演员的自我修养》"</value>
            </array>
        </property>
    </bean>

4、List注入

<bean id="student_list_hobby" class="com.DI.setGet.student">
        <property name="hobby">
            <list>
                <value>"LOL"</value>
                <value>"CSGO"</value>
            </list>
        </property>
    </bean>

5、Map注入

<bean id="student_map_card" class="com.DI.setGet.student">
        <property name="card">
            <map>
                <entry key="01" value="20210101"></entry>
                <entry key="02" value="20210102"></entry>
                <entry key="03" value="20210103"></entry>
            </map>
        </property>
    </bean>

6、Set注入

<bean id="student_games" class="com.DI.setGet.student">
        <property name="games">
            <set >
                <value>"怪物猎人"</value>
                <value>"守望屁股"</value>
            </set>
        </property>
    </bean>

7、Properties注入

<bean id="student_dedsc" class="com.DI.setGet.student">
        <property name="dedsc">
          <props>
              <prop key="m" >"1"</prop>
              <prop key="n" >"3"</prop>
          </props>
        </property>
    </bean>

8、null注入

<bean id="student_wife" class="com.DI.setGet.student">
        <property name="wife">
           <null></null>
        </property>
    </bean>

注意“”和null并不一致，下面的方法注入的不是null

<bean id="student_wife" class="com.DI.setGet.student">
        <property name="wife" value=""></property>
    </bean>

该文仅用于自我总结，难免有疏忽之处，望不断改进，努力进步！！！