Sring---注入方式

Posted 2021-03-09 chencn

1.bean.xml  创建完成成为Spring的一个bean，创建完成，然后注入使用：

   注： 依赖注入：1.依赖：bean对象的创建依赖spring容器。   2.注入：bean对象中的所有属性，由容器来注入。

   注入方式：1.构造器注入：

　　　　　　2.set注入：

public class Address {
    private String address;

    public String getAddress() {
        return address;
    }

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

package com.chen.pojo;

import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

public class Student {


    private String name;
    private Address address;
    private  String[] books;
    private List<String> hobbys;
    private Map<String,String> cards;
    private Set<String> games;
    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> getHobbys() {
        return hobbys;
    }

    public void setHobbys(List<String> hobbys) {
        this.hobbys = hobbys;
    }

    public Map<String, String> getCards() {
        return cards;
    }

    public void setCards(Map<String, String> cards) {
        this.cards = cards;
    }

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

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

    public Properties getInfo() {
        return info;
    }

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

<?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="address" class="com.chen.pojo.Address">
            <property name="address" value=""/>
        </bean>
        <bean id="student" class="com.chen.pojo.Student">
            <!--        String name-->
            <property name="name" value="chen"/>
            <!--        Address addres-->
            <property name="address" ref="address"/>
            <!--        String[]  books-->
            <property name="books">
                <array value-type="java.lang.String">
                    <value>java数</value>
                    <value>java书2</value>
                    <value>java书3</value>
                </array>
            </property>
            <!--            List<String> hobbys-->
            <property name="hobbys">
                <list value-type="java.lang.String">
                    <value>游泳</value>
                    <value>游泳</value>
                    <value>游泳</value>
                </list>
            </property>
            <!--        Map<String,String> cards-->
            <property name="cards">
                <map value-type="java.lang.String" key-type="java.lang.String">
                    <entry key="学生卡" value="123456"/>
                    <entry key="学生卡2" value="123fds456"/>
                    <entry key="学生卡3" value="1fsf23456"/>
                </map>
            </property>
            <!--           Set<String> games-->
            <property name="games">
                <set value-type="java.lang.String">
                    <value>LOL</value>
                    <value>WOW</value>
                </set>
            </property>
            <!--        String wife-->
            <property name="wife">
                <null/>
            </property>
            <!--        Properties info-->
            <property name="info">
                <props>
                    <prop key="name">chentao</prop>
                    <prop key="sex">男</prop>

                </props>
            </property>
        </bean>


        <bean id="hello" class="com.chen.pojo.Hello">

            <property name="id" value="1"/>
            <property name="name" value="lll"/>
        </bean>























</beans>

　3.P: 和 C： 命名空间的用法需要在配置文件里引入头配置链接

   C：命名空间需要 有参构造函数注入