spring——Spring 注入集合——在集合中设置对象类型的值

你的名字 2024-03-31 17:22 66阅读 0赞

### 在集合中设置对象类型的值 ###

在上面的示例中，都是在集合中通过 value 属性设置的普通类型的值，我们还可以通过 ref 属性在注入到 Bean 的集合中设置对象类型的值。  
1. 在 my-spring-demo4 项目的 net.biancheng.c 包中，创建一个名为 Course 的类，代码如下。

2. 将 JavaCollection 中的代码修改成以下形式。

3. 将 Beans.xml 中配置修改成以下内容。

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     <div> 
      <code>&lt;beans xmlns=</code> 
      <code>"http://www.springframework.org/schema/beans"</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>xmlns:xsi=</code> 
      <code>"http://www.w3.org/2001/XMLSchema-instance"</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>xsi:schemaLocation="http:</code> 
      <code>//www.springframework.org/schema/beans</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;</code> 
      <code>http:</code> 
      <code>//www.springframework.org/schema/beans/spring-beans-3.0.xsd"&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;bean id=</code> 
      <code>"course"</code>&nbsp; 
      <code>class</code> 
      <code>=</code> 
      <code>"net.biancheng.c.Course"</code> 
      <code>&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;property name=</code> 
      <code>"courseId"</code>&nbsp; 
      <code>value=</code> 
      <code>"1"</code> 
      <code>&gt;&lt;/property&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;property name=</code> 
      <code>"courseName"</code>&nbsp; 
      <code>value=</code> 
      <code>"Java课程"</code> 
      <code>&gt;&lt;/property&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/bean&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;bean id=</code> 
      <code>"course2"</code>&nbsp; 
      <code>class</code> 
      <code>=</code> 
      <code>"net.biancheng.c.Course"</code> 
      <code>&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;property name=</code> 
      <code>"courseId"</code>&nbsp; 
      <code>value=</code> 
      <code>"2"</code> 
      <code>&gt;&lt;/property&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;property name=</code> 
      <code>"courseName"</code>&nbsp; 
      <code>value=</code> 
      <code>"PHP课程"</code> 
      <code>&gt;&lt;/property&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/bean&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;bean id=</code> 
      <code>"course3"</code>&nbsp; 
      <code>class</code> 
      <code>=</code> 
      <code>"net.biancheng.c.Course"</code> 
      <code>&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;property name=</code> 
      <code>"courseId"</code>&nbsp; 
      <code>value=</code> 
      <code>"3"</code> 
      <code>&gt;&lt;/property&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;property name=</code> 
      <code>"courseName"</code>&nbsp; 
      <code>value=</code> 
      <code>"C语言课程"</code> 
      <code>&gt;&lt;/property&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/bean&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;bean id=</code> 
      <code>"javaCollection"</code>&nbsp; 
      <code>class</code> 
      <code>=</code> 
      <code>"net.biancheng.c.JavaCollection"</code> 
      <code>&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;!--数组类型--&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;property name=</code> 
      <code>"courses"</code> 
      <code>&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;array&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;ref bean=</code> 
      <code>"course"</code> 
      <code>&gt;&lt;/ref&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;ref bean=</code> 
      <code>"course2"</code> 
      <code>&gt;&lt;/ref&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;ref bean=</code> 
      <code>"course3"</code> 
      <code>&gt;&lt;/ref&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/array&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/property&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;!--List 类型--&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;property name=</code> 
      <code>"list"</code> 
      <code>&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;list&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;value&gt;张三&lt;/value&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;value&gt;李四&lt;/value&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;value&gt;王五&lt;/value&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;value&gt;赵六&lt;/value&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/list&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/property&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;!--Map 类型--&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;property name=</code> 
      <code>"maps"</code> 
      <code>&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;map&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;entry key=</code> 
      <code>"JAVA"</code>&nbsp; 
      <code>value=</code> 
      <code>"java"</code> 
      <code>&gt;&lt;/entry&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;entry key=</code> 
      <code>"PHP"</code>&nbsp; 
      <code>value=</code> 
      <code>"php"</code> 
      <code>&gt;&lt;/entry&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/map&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/property&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;!--Set 类型--&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;property name=</code> 
      <code>"sets"</code> 
      <code>&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;set&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;value&gt;MySQL&lt;/value&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;value&gt;Redis&lt;/value&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/set&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/property&gt;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>&lt;/bean&gt;</code> 
     </div> 
     <div> 
      <code>&lt;/beans&gt;</code> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

![19435d5808fce93660b890e2be647ee0.png][]

========================================================================================

项目依赖：

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>org.example</groupId>
        <artifactId>ssw</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <properties>
            <maven.compiler.source>8</maven.compiler.source>
            <maven.compiler.target>8</maven.compiler.target>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>5.3.6</version>
            </dependency>
        </dependencies>
    
    </project>

![eb8911705653d1396f7db1f016fd96b2.png][]

javacollection集合：

package org.example;
    
    import java.util.Arrays;
    import java.util.List;
    import java.util.Map;
    import java.util.Set;
    
    public class JavaCollection {
        //1 数组类型属性
        private Course[] 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;
    
        public void setCourses(Course[] 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;
        }
    
        @Override
        public String toString() {
            return "JavaCollection{" +
                    "courses=" + Arrays.toString(courses) +
                    ", list=" + list +
                    ", maps=" + maps +
                    ", sets=" + sets +
                    '}';
        }
    }

![6409b223dfc0dc55a923a655ca4f2136.png][]

course集合：

package org.example;
    
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    
    public class Course {
        private static final Log LOGGER = LogFactory.getLog(Course.class);
        //课程编号
        private Integer courseId;
        //课程名称
        private String courseName;
    
        public void setCourseId(Integer courseId) {
            this.courseId = courseId;
        }
    
        public void setCourseName(String courseName) {
            this.courseName = courseName;
        }
    
        @Override
        public String toString() {
            return "Course{" +
                    "courseId=" + courseId +
                    ", courseName='" + courseName + '\'' +
                    '}';
        }
    }

![6005d8b655e9e96b35a92b2b38ba04ff.png][]

bean.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="course" class="org.example.Course">
            <property name="courseId" value="1"></property>
            <property name="courseName" value="Java课程"></property>
        </bean>
        <bean id="course2" class="org.example.Course">
            <property name="courseId" value="2"></property>
            <property name="courseName" value="PHP课程"></property>
        </bean>
    
        <bean id="course3" class="org.example.Course">
            <property name="courseId" value="3"></property>
            <property name="courseName" value="C语言课程"></property>
        </bean>
    
        <bean id="javaCollection" class="org.example.JavaCollection">
            
            <property name="courses">
                <array>
                    <ref bean="course"></ref>
                    <ref bean="course2"></ref>
                    <ref bean="course3"></ref>
                </array>
            </property>
            
            <property name="list">
                <list>
                    <value>张三</value>
                    <value>李四</value>
                    <value>王五</value>
                    <value>赵六</value>
                </list>
            </property>
            
            <property name="maps">
                <map>
                    <entry key="JAVA" value="java"></entry>
                    <entry key="PHP" value="php"></entry>
                </map>
            </property>
            
            <property name="sets">
                <set>
                    <value>MySQL</value>
                    <value>Redis</value>
                </set>
            </property>
        </bean>
    
    
    
    </beans>

![5e07d6498253ca93bbd424f0df35bacf.png][]

执行：

package org.example;
    
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Main
    {
        private static final Log LOGGER = LogFactory.getLog(Main.class);
    
        public static void main(String[] args)
        {
            //获取 ApplicationContext 容器
            ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
    
            JavaCollection javaCollection = context.getBean("javaCollection", JavaCollection.class);
    
            LOGGER.info(javaCollection.toString());
    
            System.out.println(javaCollection.toString());
    
        }
    
    }

![fd3af2a230952bd240fa934c83f621ed.png][]

执行结果：

![f96bd7426caf453f11d7c9031a288085.png][]

[19435d5808fce93660b890e2be647ee0.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/167b8a061cbc4d29a584646982a7dcf2.png
[eb8911705653d1396f7db1f016fd96b2.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/41aa0e4a9cd947d9bc21dda673ca7ab1.png
[6409b223dfc0dc55a923a655ca4f2136.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/fd868dfddde5412f8d51dbd29a0a7f0e.png
[6005d8b655e9e96b35a92b2b38ba04ff.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/e89169f7a10241428c823f76594b1eed.png
[5e07d6498253ca93bbd424f0df35bacf.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/99caaf68c2574edfba14e8a448ab4c57.png
[fd3af2a230952bd240fa934c83f621ed.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/78e6439e5cab481c97a483d8cf1379ba.png
[f96bd7426caf453f11d7c9031a288085.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/b71f0f18ba954dd791bd63a570a2f47e.png