Spring注入集合(数组、List、Map、Set)类型属性

谁借莪１个温暖的怀抱￠ 2023-01-07 08:44 131阅读 0赞

### 目录 ###

*  注入集合(数组、List、Map、Set)类型属性
 *  把集合注入部分提取出来

# 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">
    
        
        <bean id="stu" class="com.Keafmd.spring5.collectiontype.Stu">
            
            <property name="courses">
                <array>
                    <value>Java</value>
                    <value>C++</value>
                    <value>Python</value>
                </array>
            </property>
    
            
            <property name="list">
                <list>
                    <value>小明</value>
                    <value>小红</value>
                </list>
            </property>
    
            
            <property name="maps">
                <map>
                    <entry key="Java" value="java"></entry>
                    <entry key="C++" value="c++"></entry>
                </map>
            </property>
    
            
            <property name="sets">
                <set>
                    <value>北京</value>
                    <value>上海</value>
                </set>
            </property>
    
            
            <property name="courseList">
                <list>
                    <ref bean="course1"></ref>
                    <ref bean="course2"></ref>
                </list>
            </property>
    
    
        </bean>
    
    
        
        <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>

**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

# 把集合注入部分提取出来 #

> **（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">
    
        
    
        
        <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>
    
        
        <bean id="book" 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

> **以上就是Spring注入集合类型属性的全部内容。**

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[20210115230629703.gif_pic_center]: /images/20221119/89ddea800b424338b63200b7fcd6853d.png