Spring中的set注入

最新推荐文章于 2022-04-17 14:57:18 发布

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本文详细介绍了Spring框架中各种类型的依赖注入方式，包括基本属性注入、复杂类型如集合和Map的注入，以及特殊值如NULL和Properties对象的注入，并通过具体示例展示了如何在XML配置文件中进行设置。

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Spring中的set注入

beans.xml

<?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.Oracle.pojo.Address">
        <property name="address" value="sajcfacs"></property>
    </bean>

    <bean id="student" class="com.Oracle.pojo.Student">
<!--        第一种，普通值注入：value-->
        <property name="name" value="刘振"/>
<!--        Bean注入，ref-->
        <property name="address" ref="address"></property>
        <!--        数组注入，ref-->
        <property name="book">
            <array>
                <value>红楼梦</value>
                <value>水浒传</value>
                <value>三国演义</value>
                <value>西游记</value>
            </array>
        </property>
        <!--        List注入，ref-->
        <property name="hobbies">
            <list>
                <value>听歌</value>
                <value>写代码</value>
                <value>看电影</value>
                <value>睡觉</value>
            </list>
        </property>
        <!--        map注入，ref-->
        <property name="card">
            <map>
                <entry key="身份证号" value="120112199911142114"></entry>
                <entry key="银行卡" value="154541348651511561"></entry>
            </map>
        </property>
        <!--        Set注入，ref-->
        <property name="games">
            <set>
                <value>LOL</value>
                <value>CF</value>
                <value>CS</value>
            </set>
        </property>
        <!--        NULL注入，ref-->
        <property name="wife">
            <null></null>
        </property>
<!--        Properties注入-->
        <property name="info">
            <props>
                <prop key="driver">20181013</prop>
                <prop key="url">男</prop>
                <prop key="username">root</prop>
                <prop key="password">root</prop>
            </props>
        </property>

    </bean>


</beans>

Student.java

package com.Oracle.pojo;

import java.util.*;

public class Student {
    private String name;
    private Address address;
    private String[] book;
    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[] getBook() {
        return book;
    }

    public void setBook(String[] book) {
        this.book = book;
    }

    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 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 "Student{" +
                "name='" + name + '\'' +
                ", address=" + address.toString() +
                ", book=" + Arrays.toString(book) +
                ", hobbies=" + hobbies +
                ", card=" + card +
                ", games=" + games +
                ", wife='" + wife + '\'' +
                ", info=" + info +
                '}';
    }
}

Address.java

package com.Oracle.pojo;
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 + '\'' +
                '}';
    }
}

测试类 MyTest.java

import com.Oracle.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());
        System.out.println(student.getAddress());
        System.out.println(student.getBook());
        System.out.println(student.getCard());
        System.out.println(student.getGames());
        System.out.println(student.getHobbies());
        System.out.println(student.getInfo());
        System.out.println(student.getWife());
        System.out.println(student);

    }
}