JavaEE Spring框架中Bean容器使用实例

分手后的思念是犯贱 2022-12-05 10:20 215阅读 0赞

# 系列文章目录 #

[Spring初识][Spring]

### Bean容器使用实例 ###

*  系列文章目录
 *  创建类
 *   *  java类
     *  applications.xml
     *  pom.xml配置文件
     *  main函数
 *  运行结果

# 创建类 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70_pic_center]

## java类 ##

**animal类**  
实现 狗 2 》猫 3 》鸭 4 》 鸡 9 名字和年龄的顺序

//animal 名字分别为狗 2  》猫 3 》鸭 4 》 鸡 9
    public class Animals {
        
        private String name;
        private Integer age;
        private Animals next;
    
        public Animals() {
        
    
        }
        public Animals(String name, Integer age) {
        
            this.name = name;
            this.age = age;
        }
    
        public Animals getNext() {
        
            return next;
        }
    
        public void setNext(Animals next) {
        
            this.next = next;
        }
    
    
    
        public String getName() {
        
            return name;
        }
    
        public void setName(String name) {
        
            this.name = name;
        }
    
        public Integer getAge() {
        
            return age;
        }
    
        public void setAge(Integer age) {
        
            this.age = age;
        }
    
        @Override
        public String toString() {
        
            return "Animals{" +
                    "name='" + name + '\'' +
                    ", age=" + age +
                    ", next=" + next +
                    '}';
        }
    }

**将类中的数据以链表的形式放到bean容器中**

public class Animals1 {
        
        private String name;
        private Integer age;
    
    
        public Animals1() {
        
    
        }
        public Animals1(String name, Integer age) {
        
            this.name = name;
            this.age = age;
        }
    
    
        public String getName() {
        
            return name;
        }
    
        public void setName(String name) {
        
            this.name = name;
        }
    
        public Integer getAge() {
        
            return age;
        }
    
        public void setAge(Integer age) {
        
            this.age = age;
        }
    
        @Override
        public String toString() {
        
            return "Animals1{" +
                    "name='" + name + '\'' +
                    ", age=" + age +
                    '}';
        }
    }

**Zoo链表**

import java.util.List;
    
    public class Zoo {
        
       private List<Animals1> animalsList;
    
        public List<Animals1> getAnimalsList() {
        
            return animalsList;
        }
    
        public void setAnimalsList(List<Animals1> animalsList) {
        
            this.animalsList = animalsList;
        }
    
        @Override
        public String toString() {
        
            return "Zoo{" +
                    "animalsList=" + animalsList +
                    '}';
        }
    }

## applications.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 = "a1" class="Animals">
            <property name="name" value="狗"/>
            <property name="age" value="2"/>
            <property name="next" ref="a2"/>
    
        </bean>
    
        <bean id = "a2" class="Animals">
            <property name="name" value="猫"/>
            <property name="age" value="3"/>
            <property name="next" ref="a3"/>
    
        </bean>
    
        <bean id = "a3" class="Animals">
            <property name="name" value="鸭"/>
            <property name="age" value="4"/>
            <property name="next" ref="a4"/>
    
        </bean>
    
        <bean id = "a4" class="Animals">
            <property name="name" value="鸡"/>
            <property name="age" value="9"/>
        </bean>
    
     
        <bean id = "b1" class="Animals1">
            <property name="name" value="狗"/>
            <property name="age" value="2"/>
    
        </bean>
    
        <bean id = "b2" class="Animals1">
            <property name="name" value="猫"/>
            <property name="age" value="3"/>
    
        </bean>
    
        <bean id = "b3" class="Animals1">
            <property name="name" value="鸭"/>
            <property name="age" value="4"/>
    
        </bean>
    
        <bean id = "b4" class="Animals1">
            <property name="name" value="鸡"/>
            <property name="age" value="9"/>
        </bean>
    
        
        <bean id="zoo" class="Zoo">
            <property name="animalsList">
                <list>
                    <ref bean="b1"/>
                    <ref bean="b2"/>
                    <ref bean="b3"/>
                    <ref bean="b4"/>
    
    
                </list>
            </property>
        </bean>
    
    </beans>

## pom.xml配置文件 ##

<?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>untitled</artifactId>
      <version>1.0-SNAPSHOT</version>
    
      <dependencies>
        
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context</artifactId>
          <version>5.2.3.RELEASE</version>
        </dependency>
        
        <dependency>
          <groupId>ch.qos.logback</groupId>
          <artifactId>logback-classic</artifactId>
          <version>1.2.3</version>
        </dependency>
      </dependencies>
    
      <build>
        <plugins>
          <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
              <source>1.8</source>
              <target>1.8</target>
              <encoding>UTF-8</encoding>
            </configuration>
          </plugin>
        </plugins>
      </build>
    </project>

## main函数 ##

import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    import java.util.zip.GZIPOutputStream;
    
    public class Main {
        
        public static void main(String[] args) {
        
            /**
             * Spring 开启容器的方式: ApplicationContext 应用上下文(可以配置#营理Bean对象。及其他的工作)
             * ClassPathXmLApplicationContext 根据classpath路径，指定一个xml 文件(配置文件)。
             *并根据配置文件完成配置工作(Bean的实例化)
             */
            ApplicationContext context = new
                    ClassPathXmlApplicationContext("applications.xml");
    
            //通过bean的名称获取bean对象，bean名称就是xml中bean的id
            Animals a1 = (Animals) context.getBean("a1");
            System.out.println(a1);
    
    
           Zoo zoo = (Zoo)context.getBean("zoo");
            System.out.println(zoo);
    
        }
    }

# 运行结果 #

21:30:49.601 [main] DEBUG org.springframework.context.support.ClassPathXmlApplicationContext - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@6504e3b2
    21:30:49.814 [main] DEBUG org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loaded 9 bean definitions from class path resource [applications.xml]
    21:30:49.863 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'a1'
    21:30:49.934 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'a2'
    21:30:49.934 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'a3'
    21:30:49.934 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'a4'
    21:30:49.937 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'b1'
    21:30:49.939 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'b2'
    21:30:49.940 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'b3'
    21:30:49.940 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'b4'
    21:30:49.940 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'zoo'
    Animals{
        name='狗', age=2, next=Animals{
        name='猫', age=3, next=Animals{
        name='鸭', age=4, next=Animals{
        name='鸡', age=9, next=null}}}}
    Zoo{
        animalsList=[Animals1{
        name='狗', age=2}, Animals1{
        name='猫', age=3}, Animals1{
        name='鸭', age=4}, Animals1{
        name='鸡', age=9}]}

[Spring]: https://editor.csdn.net/md/?articleId=108422162
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