详解Spring注入集合(数组、List、Map、Set)类型属性

（1）创建类，定义数组，list，map，set类型属性，并且生成对应的set方法。（2）在spring配置文件中进行配置。

Stu类：

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); }}

bean1.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 http://www.springframework.org/schema/beans/spring-beans.xsd'> <!--集合类型属性注入--> <bean 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 class='com.Keafmd.spring5.collectiontype.Course'> <property name='cname' value='Spring5框架'></property> </bean> <bean class='com.Keafmd.spring5.collectiontype.Course'> <property name='cname' value='MyBatis框架'></property> </bean></beans>

测试类：

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(); }}

输出结果：

[Java, C++, Python][小明, 小红]{Java=java, C++=c++}[北京, 上海][Course{cname=’Spring5框架’}, Course{cname=’MyBatis框架’}]

Process finished with exit code 0

（1）在spring配置文件中引入名称空间util（在配置信息中添加xmlns:util='http://www.springframework.org/schema/util'和http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd'）。（2）提取list集合类型属性注入。（3）把提取的list集合类型属性注入使用。

Book类：

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); }}

bean2.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' 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 class='com.Keafmd.spring5.collectiontype.Book'> <property name='list' ref='bookList'></property> </bean></beans>

测试代码：

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(); }}

输出结果：

[老人与海, 平凡的世界, 阿甘正传]

Process finished with exit code 0

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