Spring依赖注入多种类型数据的示例代码

目录

• Student实体类
• StudentsClass实体类
• beans.xml
• 测试

Student实体类

package entity;
import java.util.*;
/**
 * @author LeDao
 * @company
 * @create 2022-02-13 21:26
 */
public class Student {
    private int id;
    private String name;
    private StudentClass studentClass;
    private String[] books;
    private List<String> hobbies;
    private Map<String, String> cards;
    private Set<String> games;
    private String wife;
    private Properties info;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    public String getName() {
        return name;
    public void setName(String name) {
        this.name = name;
    public StudentClass getStudentClass() {
        return studentClass;
    public void setStudentClass(StudentClass studentClass) {
        this.studentClass = studentClass;
    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> 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 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{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", studentClass=" + studentClass +
                ", books=" + Arrays.toString(books) +
                ", hobbies=" + hobbies +
                ", cards=" + cards +
                ", games=" + games +
                ", wife='" + wife + '\'' +
                ", info=" + info +
                '}';
}

StudentsClass实体类

package entity;
/**
 * @author LeDao
 * @company
 * @create 2022-02-14 14:11
 */
public class StudentClass {
    private int id;
    private String name;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public String toString() {
        return "Class{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
}

beans.xml

下面展示的数据类型有：一般类型、对象、数组、List、Map、Set、空值、Properties

<?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 http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="studentClass1" class="entity.StudentClass">
        <property name="id" value="1"/>
        <property name="name" value="软件工程3班"/>
    </bean>
    <bean id="user1" class="entity.Student">
        <!--一般类型-->
        <property name="id" value="1"/>
        <property name="name" value="tom"/>
        <!--对象-->
        <property name="studentClass" ref="studentClass1"/>
        <!--数组-->
        <property name="books">
            <array>
                <value>Java编程思想</value>
                <value>MySQL必知必会</value>
                <value>平凡的世界</value>
            </array>
        </property>
        <!--List-->
        <property name="hobbies">
            <list>
                <value>唱</value>
                <value>跳</value>
                <value>rap</value>
                <value>打篮球</value>
            </list>
        </property>
        <!--Map-->
        <property name="cards">
            <map>
                <entry key="身份证" value="123"/>
                <entry key="校园卡" value="321"/>
            </map>
        </property>
        <!--Set-->
        <property name="games">
            <set>
                <value>LOL</value>
                <value>DNF</value>
                <value>COC</value>
            </set>
        </property>
        <!--空值-->
        <property name="wife">
            <null/>
        </property>
        <!--Properties-->
        <property name="info">
            <props>
                <prop key="userName">root</prop>
                <prop key="password">123456</prop>
            </props>
        </property>
    </bean>
</beans>

测试

import config.MyConfig;
import entity.Student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
 * @author LeDao
 * @company
 * @create 2022-02-12 15:56
 */
public class MyTest {
    public static void main(String[] args) {
        ApplicationContext context=new ClassPathXmlApplicationContext("beans.xml");
        Student student = (Student) context.getBean("user1");
        System.out.println(student);
    }
}

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