详解Spring注入集合(数组、List、Map、Set)类型属性

package com.Keafmd.spring5.collectiontype;

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

/**
 * Keafmd
 *
 * @ClassName: Stu
 * @Description: IOC操作Bean管理（xml注入属性集合）
 * @author: 牛哄哄的柯南
 * @date: 2021-01-15 14:15
 */
public class Stu {

  //1、数组类型属性
  private String[] courses;

  //2、list集合类型属性
  private List<String> list;

  //3、map集合类型属性
  private Map<String,String> maps;

  //4、set集合类型属性
  private Set<String> sets;


  //学生所学的多门课程
  private List<Course> courseList;

  public void setCourseList(List<Course> courseList) {
    this.courseList = courseList;
  }

  public void setCourses(String[] courses) {
    this.courses = courses;
  }

  public void setList(List<String> list) {
    this.list = list;
  }

  public void setMaps(Map<String, String> maps) {
    this.maps = maps;
  }

  public void setSets(Set<String> sets) {
    this.sets = sets;
  }

  public void test(){
    System.out.println(Arrays.toString(courses));
    System.out.println(list);
    System.out.println(maps);
    System.out.println(sets);
    System.out.println(courseList);
  }

}

<?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">

  <!--集合类型属性注入-->
  <bean id="stu" class="com.Keafmd.spring5.collectiontype.Stu">
    <!--数组类型属性注入-->
    <property name="courses">
      <array>
        <value>Java</value>
        <value>C++</value>
        <value>Python</value>
      </array>
    </property>

    <!--list类型属性注入-->
    <property name="list">
      <list>
        <value>小明</value>
        <value>小红</value>
      </list>
    </property>

    <!--map类型属性注入-->
    <property name="maps">
      <map>
        <entry key="Java" value="java"></entry>
        <entry key="C++" value="c++"></entry>
      </map>
    </property>

    <!--set类型属性注入-->
    <property name="sets">
      <set>
        <value>北京</value>
        <value>上海</value>
      </set>
    </property>

    <!--注入list集合类型，值是对象-->
    <property name="courseList">
      <list>
        <ref bean="course1"></ref>
        <ref bean="course2"></ref>
      </list>
    </property>
  </bean>

  <!--创建多个course对象-->
  <bean id="course1" class="com.Keafmd.spring5.collectiontype.Course">
    <property name="cname" value="Spring5框架"></property>
  </bean>

  <bean id="course2" class="com.Keafmd.spring5.collectiontype.Course">
    <property name="cname" value="MyBatis框架"></property>
  </bean>
</beans>

package com.Keafmd.spring5.testdemo;
import com.Keafmd.spring5.bean.Orders;
import com.Keafmd.spring5.collectiontype.Book;
import com.Keafmd.spring5.collectiontype.Course;
import com.Keafmd.spring5.collectiontype.Stu;
import com.Keafmd.spring5.factorybean.MyBean;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Keafmd
 *
 * @ClassName: TestSpring5demo1
 * @Description: 测试类
 * @author: 牛哄哄的柯南
 * @date: 2021-01-15 14:30
 */
public class TestSpring5demo1 {

  @Test
  public void testCollection1(){

    ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
    Stu stu = context.getBean("stu",Stu.class);
    stu.test();
  }
}

package com.Keafmd.spring5.collectiontype;
import java.util.List;

/**
 * Keafmd
 *
 * @ClassName: Book
 * @Description:
 * @author: 牛哄哄的柯南
 * @date: 2021-01-15 14:56
 */
public class Book {
  private List<String> list;

  public void setList(List<String> list) {
    this.list = list;
  }
  public void test(){
    System.out.println(list);
  }
}

<?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:util="http://www.springframework.org/schema/util"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
              http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">

  <!--把集合注入部分提取出来-->

  <!--1、提取list集合类型属性注入-->
  <util:list id="bookList">
    <value>老人与海</value>
    <value>平凡的世界</value>
    <value>阿甘正传</value>
  </util:list>

  <!--2、提取list集合类型属性注入使用-->
  <bean id="book" class="com.Keafmd.spring5.collectiontype.Book">
    <property name="list" ref="bookList"></property>
  </bean>
</beans>

package com.Keafmd.spring5.testdemo;
import com.Keafmd.spring5.bean.Orders;
import com.Keafmd.spring5.collectiontype.Book;
import com.Keafmd.spring5.collectiontype.Course;
import com.Keafmd.spring5.collectiontype.Stu;
import com.Keafmd.spring5.factorybean.MyBean;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Keafmd
 *
 * @ClassName: TestSpring5demo1
 * @Description: 测试类
 * @author: 牛哄哄的柯南
 * @date: 2021-01-15 14:30
 */
public class TestSpring5demo1 {

  @Test
  public void testCollection2(){

    ApplicationContext context = new ClassPathXmlApplicationContext("bean2.xml");
    Book book = context.getBean("book",Book.class);
    book.test();

  }
}