Spring

1、Spring注入的具體例項

　　建立兩個實體類

　　1、Address.class

package com.charles.pojo;

public class Address {
    private String address;

    public Address(){}

    public Address(String address) {
        this.address = address;
    }

    public String getAddress() {
        return address;
    }

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

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

　　2、Custom.class

package com.charles.pojo;

import java.util.*;

public class
 
 Custom {

    private String name;
    private Address address;
    private String[] books;
    private List<String> hobby;
    private Map<Integer,String> idCard;
    private Set<String> games;
    private String wife;
    private Properties info;

    public Custom(){}

    public
 
 Custom(String name, Address address, String[] books, List<String> hobby, Map<Integer, String> idCard, Set<String> games, String wife, Properties info) {
        this.name = name;
        this.address = address;
        this.books = books;
        this.hobby = hobby;
        this.idCard = idCard;
        this.games = games;
        this.wife = wife;
        this.info = 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> getHobby() {
        return hobby;
    }

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

    public Map<Integer, String> getIdCard() {
        return idCard;
    }

    public void setIdCard(Map<Integer, String> idCard) {
        this.idCard = idCard;
    }

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

    public void setGames(Set<String> 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 "Custom{" +
                "name='" + name + '\'' +
                ", address=" + address +
                ", books=" + Arrays.toString(books) +
                ", hobby=" + hobby +
                ", idCard=" + idCard +
                ", games=" + games +
                ", wife='" + wife + '\'' +
                ", info=" + info +
                '}';
    }
}

　　3、ApplicationContext.xml配置類中注入值

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">

    <bean id="address" class="com.charles.pojo.Address">
        <property name="address" value="ShangHai"/>
    </bean>

    <bean id="custom" class="com.charles.pojo.Custom">
        <property name="name" value="Charles"/>
        <property name="address" ref="address"/>
        <property name="books">
            <array>
                <value>MYSQL</value>
                <value>DOCKER</value>
                <value>JAVA</value>
            </array>
        </property>
        <property name="hobby">
            <list>
                <value>GAMING</value>
                <value>CODING</value>
                <value>DANCING</value>
            </list>
        </property>

        <property name="idCard">
            <map>
                <entry key="1" value="441521"/>
                <entry key="2" value="20021116"/>
            </map>
        </property>

        <property name="games">
            <set>
                <value>GTA</value>
                <value>APEX</value>
                <value>LOL</value>
            </set>
        </property>

        <property name="wife">
            <null/>
        </property>

        <property name="info">
            <props>
                <prop key="email">[email protected]</prop>
                <prop key="username">Charles_H</prop>
                <prop key="phone">110</prop>
            </props>
        </property>
    </bean>

</beans>

　　4、進行測試

    @Test
    public void test2(){
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        System.out.println(context.getBean("custom").toString());
    }

　　測試結果

2、IOC建立物件的方式

　　1、無參構造建立物件(預設方式）

　　2、有參構造：

　　　　1. 下標賦值

<constructor-arg index="0" value="Charles"/>

　　　　2. 型別賦值

<constructor-arg type="java.lang.String" value="Charles"/>

　　　　3. 直接通過引數名來賦值

<constructor-arg name="id" value="1"/>
<constructor-arg name="username" value="Hello~"/>

3、關於Spring的配置

　　別名

    <alias name="custom" alias="cs"/>
    <bean id="cs" class="com.charles.pojo.Custom"/>

　　import 用於合併配置檔案

由於在實際開發當中，我們需要配置的東西非常多。因此，為了不弄混，我們的配置都是分開進行配置，最後在進行合併，最後只有呼叫該配置即可。

<?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">

    <import resource="beans.xml"/>

</beans>